S10 proportioning valve reset The fluid was a little low. I came across some advice about opening the bleeders on the front brakes and applying brake pressure to trick the valve into sliding back the other direction until it re-centers. In this video, I walk you through the entire process of diagnosing a tripped and stuck combination brake valve (often called the proportioning valve). 2L, 2WD with ABS that has started losing a fair amount of brake fluid. Dec 25, 2024 · Yes. About this item AC Delco Brake Valve - 172-2280 GM Genuine Parts OE Brake Pads are specifically designed to work with GM vehicle safety systems, such as electronic traction control and anti-lock brakes Semi Brake Valve ACDelco 172-2280 GM Original Equipment Brake Proportioning Valve S10 Proportioning Valve Reset USD$ 15 Price when purchased online Free shipping Free 30-day returns Add to cart I just replaced the mastercyinder on my 1987 S10 pickup, bled the brake system and the Brake warning Light stays on the May 11, 2024 · Introduction Brake proportioning valves are crucial components of vehicle braking systems, responsible for ensuring balanced brake force distribution and optimal performance. Oct 12, 2004 · C3 Tech/Performance - How do you re-center the proportioning valve? - This is actually for my '76 Suburban, but the prop valves look about the same and I figure the procedure is about the same. Find our best fitting brake proportioning valves for your vehicle and enjoy free next day delivery or same day pickup at a store near you! DBC-140420 GM S10 Late Rear Disc Brake Conversion Fitment 92-03 S-series Trucks 93-04 Some F-Body How to unstick a proportioning valve? Exercise the Valve: Apply and release pressure to the brake system multiple times while simultaneously manipulating the valve's adjustment mechanism. What exactly does this proportioning valve do, how much $, were do I get one, and does anyone have pics of it in use? Getting tired of relocating The proportioning valve determines the percentages of brake fluid directed to the front and rear brakes to ensure safe braking. my proportioning valve is out of center due to improper bleeding after replacing the rear calipers (self inflicted) and is now stopping the flow to the rear calipers. May 10, 2020 · I did the Blazer disc brake swap on both of my '03 sonomas I did not change the proportioning valve on either one brakes work great on one sonomas I have 20-in rims on the other Sonoma I have 15-in rims. The valve consists of three sections: the metering valve, the warning switch and the proportioning valve. For DIY mechanics, this often occurs due to a few common scenarios: Pressure Proportioning Valve Plumbing The most common proportioning valve plumbing is shown below. Still worried about why the line was spewing fluid at the top to begin with though. After continued Mar 28, 2006 · how do you reset a proportioning valve? Discussion in ' The Hokey Ass Message Board ' started by 40oz. This is to show you, that if you have an old chevy with this valve for the front and rear brakes. May 21, 2007 · Brake Proportioning Valve problems. does anyone know how to reset it so I can bleed the brakes? Can my car run without a brake proportioning valve? Without a brake proportioning valve, your car’s braking system would continue to lock up. Jun 23, 2018 · Reset proportioning valve on '99 S10 4. Dec 16, 2020 · After fitting new rear brake lines to my 92 K1500, the inevitable happened with the proportioning valve closing off the rear brakes and now being unable to bleed them. I just installed new discs, new lines, new master, new booster, new prop. Dec 14, 2013 · So the dumb thing won't go out. Perfect for maintenance and care. I have been having problems with my brakes and now I'm not getting any fluid to my front. It's been a loooong time since I messed with this exact issue, but Buy Brake Proportioning Valve - NMC M552 online from NAPA Auto Parts Stores. 3 engine. May 25, 2018 · Possibly. How will I know when brake proportioning valve needs to be replaced? It’s a solid indication that your proportioning valve is broken if the rear wheels of your car are sliding more than usual. Apr 5, 2018 · About this item Versatile Brake Tool: Experience seamless brake maintenance with the A-Team Performance Brake Proportioning Valve Bleeder Tool. Aug 14, 2025 · Why Your Valve Trips: Common Scenarios The brake proportioning valve, specifically its pressure differential sensing mechanism, is designed to trip and activate the warning light under specific conditions, primarily when it detects an imbalance in the hydraulic pressure between the front and rear brake circuits. A brake proportioning valve is typically located in the rear brake line and enables you to adjust the rate of pressure increase to the rear brakes. Jun 3, 2004 · Does anyone know the process for resetting the brake proportioning valve? its a 68 with a brake booster and front disc brakes. If the proportioning valve is misaligned, it can/ will prevent fluid flow to the line (s) until it is properly reset (and no amount of vacuum at the wheel cylinder will overcome a closed line). The reset button usually has a rubber cap on it. Universal fit proportioning valve/combination valve mounting brackets mount your combination valves either to the frame or directly under the master cylinder, providing access to lines and fittings. I have no experience with I tested the Proportioning Valve Reset Tool and it transformed my brake system setup! Discover how this tool can simplify your brake adjustments today. Order yours online today and pick up from the store. Hope this helps someone. After trying several methods: flushing fluid through the master to make sure it didn't have any How to manually reset GM brake proportioning valve for S10 or Squarebody Trucks and Trikes 86 subscribers Subscribe Feb 1, 2024 · How proportioning valves work, fixed vs adjustable valves explained, and how to reset a prop valve. It will have one or two buttons located on it. Equal brake force cannot be applied to all of the wheels on the car at the same time because the rear wheels will lock up. Vehicles with drum brakes in the rear have much lower pressure for the drum brakes Dec 22, 2024 · I can't seem to stop the leaking brake light switch on the proportioning valve. An alternative plumbing method is to plug off the top front line and have the bottom front line go to a “T” fitting. below) It is usually mounted to a bracket which shares the master cylinder mounting studs on the brake booster. All fit 1986-2003 Chevrolet S10 and more. There are a few videos on the tube but I thought I would ask you guys as to your experience in re centering the valve so that I DISCLAIMER: These videos show my way of doing things. i've done this on my old s10 but it already had a proportioning valve on it so i only had to reroute the lines and "t" the front lines. When the light goes out, close the bleeder screw. Step 2: Push the reset button located on the valve with your Aug 27, 2023 · Discover how to unstick a brake proportioning valve with this simple guide. The valve stops the flow, or pressure of brake fluid to the rear drum brakes during every heavy braking or emergency stops; otherwise, the rear brakes lock up and skid, receiving too much pressure from the DISCLAIMER: These videos show my way of doing things. Get deals on automotive parts, truck parts and more. Go to YouTube and search for S10 Proportioning Customer: my rear brake line busted so i replaced it and now i cant bleed the rear brakes i was told the proportioning valve is the reason. It seemed to be caused by the proportioning valve. If his method doesn't work, try this one. May 22, 2025 · Learn how to reset your brake proportioning valve to restore proper brake bias. I have a '77 stock vette that recently began leaking fluid from the master cylinder (where it meets the booster). The valve is typically an “L”-shaped metal valve. Apr 4, 2018 · Good technique to re-center proportioning valve? Suspension Feb 16, 2009 · regarding the proportioning valve on the master cylinder - what exactly does this look like? - I was told this needed to be adjusted to correct the intermittent brake light problem on the dash - I know where the master cylinder is, just dont know what the valve looks like - thanks We would like to show you a description here but the site won’t allow us. Sep 3, 2024 · You have an old vehicle sixties, 70s, 80s GM Make sure your proportion valve, the little plunger inside is centered and I'll tell you right now guys, my proportion valve is somewhere right there along the frame. Using the PV Tool from MBM this video shows how to bleed your proportioning valve correct. what ever you want to call it. This action helps dislodge any stuck components and restore proper valve function. Understand when and why a reset is needed, how to unstick a stuck valve, common mistakes to avoid, and how to test brake balance after reset. May 16, 2014 · I have read on forums that to reset the proportioning valve you just stomp on the brakes and it will pop back to neutral position. Apr 6, 2014 · Hey guys!!! New to the forum! Basically had bad wheel cylinder in rear. Mar 14, 2024 · Proportioning Valve Keeps Tripping? The 1967 - 1972 Chevrolet & GMC Pickups Message Board Jan 11, 2012 · The factory proportioning valve in the fiero limits maximum pressure to the rear hydraulic lines, while still allowing a quick take-up fluid push to the rear to make sure the rear brakes get enough. Not properly bleeding the proportioning valve can result in uneven braking and potential safety hazards. This diagram I made may help show the steps involved in centering that valve, starting top left to bottom right. Fix spongy brakes & improve safety. I boiled down the biggest problem of my entire system is that the proportioning valve tripped and blocked off my rear brakes. and trying to Mar 8, 2018 · I have a 98 s10 LS with a 4. I also have read on these forums that the black rubber cap on the front of the proportioning valve is a cover for a reset switch. Model specific subject matter experts, classified ads and more. Jan 11, 2016 · The proportioning valve, also called the combination valve, is located in the disc braking system. so my question is which proportioning valve do I need? it has disc Mar 13, 2009 · The residual pressure valve that is built into the proportioning valve is what keeps the 10 PSI in the brake lines and gets the rear brakes to apply at the same time as the front. At least I think the Prop Valve does this. Prop valve is tripped and plunger needs to move to center . Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Has anyone found a plug for this? I'm not using the switch. I'm comfortable swapping the If rear brakes won’t bleed after replacing the brake line, check the proportioning valve for blockage or internal failure. To check, I can feel the metering valve extend when brake pedal is pushed. The brake light is being triggered by the switch on the proportioning valve. Any help would be greatly appreciated. Use ACDelco 172-2069 backwards and you should be golden. Proportioning Combination valve 67' Mustang Disc Brake Conversion - Do Not Buy This One Proportioning Valve Resetting and Shuttle Valve Bleed Tool Installing CSRP Front Disc Brakes - 1966 Ford Mustang 289 Conversion - Episode 10 Jan 28, 2016 · Tried to hold in proportioning valve reset button per manual with small clamp (no tool). Eliminate the problem of having to reset a proportioning valve by using our simple tool. took the Nov 25, 2009 · Slowly press the pedal with steady pressure a number of times until the light goes out; this will center the differential valve. 3 Jump to Latest 13K views 13 replies 5 participants last post by OpalLacod Mar 22, 2022 thehemi Discussion starter Sep 2, 2025 · Learn how to reset a brake proportioning valve step by step. Manual says it will light up with a difference in pressure between the 2 circuits, fix the problem, slam on the brakes to reset. This valve is typically plumbed into the rear brake line or built into the combination valve below the master cylinder. com. But that was disputed and is a bias setting for front to back pressure ratio. Elevate your May 30, 2019 · I’m working on a stock drum brake system all new components except the proportional valve. I was thinking of pulling out my ABS and put a normal proportioning valve but does it matter which one I use? Proportioning Valve Resetting and Shuttle Valve Bleed Tool Ukraine Waited for Russian Troops to Cross the River – Then BLEW the Bridge Apart Jan 3, 2023 · C3 Tech/Performance - proper way to reset proportioning valve? - Hey folks, I've been reading the forum on and off for quite some time, but this is my first time posting. Not me. Jan 8, 2012 · I have a 99' tahoe that i am relocating under the hood on and need to get rid of the abs. Feb 20, 2022 · The vacuum procedure in the video is possibly OK for brake line (s) that have an unobstructed flow from the MC to the wheel cylinder. Each stamped steel bracket I tested the Proportioning Valve Reset Tool—easy to use, reliable, and a must-have for quick brake system repairs. valve. Reset my proportioning valve after the rear drums weren’t getting any fluid following a master cylinder change. This video will show you how to reset the valve to have the Feb 1, 2022 · Shop Amazon for PAGOW 1 Pack Proportioning Valve Bleeder Tool, PV2 PV4 Disc/Drum Brake Proportioning Valve Bleeder Tool, for 172-1353 172-1371 with GMs Street Rod Classic Car and Chevys Truck -Blue and find millions of items, delivered faster than ever. This comprehensive guide will walk you through the process, providing you with the knowledge and confidence to handle this essential maintenance task. Feb 15, 2024 · In addition to our syringe bleeder kit, we offer a proportioning valve centering tool, also referred to as a bleeder tool, to place in your combination valve prior to bleeding. This is the metering valve returning to its equalized position. Does this thing actually slide over and cut off the rear brakes from getting any fluid at all? I put new wheel cylinders in and im trying Dec 18, 2009 · The proportioning/isolation valve could be stuck as it thinks there's a leak in one half of the brake system isolating it so you still have some braking capability. push the pedal). This diagram I made may help show the steps involved in centering that valve, starting top left to bottom right. Don't necessarily follow my advice, I could be wrong. Aug 5, 2024 · Resetting a Ford Brake Proportioning Valve To reset a Ford brake proportioning valve, you can follow these steps: Step 1: Locate the brake proportioning valve near the rear brake line. I Jun 6, 2024 · To bleed a proportioning valve without a tool, slowly turn the screw counterclockwise until air bubbles escape from the bleeder valve. It changes the proportion of brake fluid. My brake pedal is hard as a rock and barely will stop the car and now I can not bleed anything out of the front brakes. 8LSymptom: Whenever I touch the brake pedal even lightly, the rear driver side brakes completely lock up. I know there is a procedure to follow to reset the proportional Sep 26, 2024 · Brake proportioning valve problems can cause rear-wheel lockup, longer stopping distances, and inconsistent braking performance. You can slow down the pressure increase that happens when you apply the brakes with a brake proportioning valve. There is some confusion, though, about what these valves do, how they do it, and how to properly Shop wholesale-priced OEM Chevrolet S10 Brake Proportioning Valves at GMPartsGiant. Over time, these valves may require resetting or become stuck, leading to issues with braking efficiency and safety. so follow along to get help with Shop our disc brake proportion valve for Chevrolet/GMC S10, S15, Sonoma 1982-2004, Chevrolet S10 Blazer 1983-2005, GMC Jimmy 1983-2001. When done correctly, this process can help ensure that your brakes are functioning optimally and safely. I checked the brake lines, and found the line on the rear axle going to the passenger rear wheel was leaking. 67-72The server is too busy at the moment. My expert tips and tricks will help you get back on the road without any hassle. If this is true, I have a 96 S10 in my possession I could probably rob the proportioning valve off of for the time being. Get the job done with the right part, at the right price. From the “T” fitting, the front lines are then split off to the left and right calipers. I have an idea how to get fluid to the rear by bypassing prop valve and connecting tubing from m cyl to the rear line and pumping the pedal then reconnecting brake lines to original position. I was lucky enough to find someone selling pre-bent lines on ebay, and ordered a Forum Jump: Previous Topic Next Topic Topic Tags: Chevy S10 (4) , ABS (74) , proportioning valve (2) , reset (6) Today I'm working on a 1985 Chevrolet S-10 2. Jul 21, 2011 · From what I can gather I believe the Proportioning Valve has cut off the rear brakes due to "catastrophic pressure loss". Go to this page How to Repair a Brake Warning Light Problem and the guy explains the valve and how to reset it (Step 4). Chevy Forums FREE technical assistance for your restoration and repair. If no fluid passes, the proportioning valve The brake proportioning valve is a metering device that equalizes the pressure between the front and rear brakes. Bob Wilson, owner of RJ Restorations, explains how the proportioning valve functions and demonstrates the process of rebuilding one. Initially the warning light was off in the bleeding process and I tried to great care not trip the valve but at some point I tripped it. After inspection, I see that the leak is coming from the little weep hole (vent hole?) at the FRONT end of the proportional valve mounted next to the master cylinder. Resetting the Combination Proportioning Valve. Acutally no fluid is going the front brake lines at all. If I remember well, when I did my kit, the kit was made by Ryanne (rights bought by Held). Compatible with DISC/DISC and DISC/DRUM PV2 and PV4 systems, this tool enhances efficiency and precision Reliable Compatibility: Perfectly suited for AC Delco 172-1353 and 172-1371 models, this GM brake tool ensures smooth operation. These issues often arise from wear and tear, contamination, or incorrect fluid pressure in the brake system. In this extensive guide, we will delve into the intricacies of brake proportioning valves, exploring how May 30, 2023 · I am replacing my brake booster, master cylinder and proportional valve on my disk/drum brake set up on my 1968 Nova. first showed up after removing the bed to replace fuel pump. It won't go on correctly, you'll have to flip it backwards but I can confirm perfect fitment and great brakes once again. Customer: my rear brake line busted so i replaced it and now i cant bleed the rear brakes i was told the proportioning valve is the reason. AutoZone offers Free In-store Pickup for Chevrolet Brake Proportioning Valve. Jul 23, 2017 · I have a 2001 S10 LS, 2. This valve balances brake pressure; if stuck closed, it prevents fluid flow during bleeding. Mar 16, 2025 · Understanding how to reset the brake proportioning valve can be invaluable for car owners, as it can help address issues related to brake performance and ensure optimal safety. I feel pretty confident it is the new CPP proportioning valve need to be reset somehow, but I don't know how. Had to reset the proportioning valve. Replaced it and now no fluid to the rear. But if PV2/PV4 Proportioning Valve KIT Installation Instructions (left Side Kit used for example, but instructions apply to all kits) Aug 5, 2007 · I can't seem to bleed the front brakes. Jun 8, 2021 · proportion valve or distribution block The 1967 - 1972 Chevrolet & GMC Pickups Message Board Mar 23, 2023 · Easiest/best way to reset Brake switch proportioning valve Suspension TECH. Keep your vehicle safe with proper brake bias control. Jun 9, 2009 · Alright some of you may have seen my other thread in this same section. (See fig. Oct 13, 2009 · 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - Resetting Proportioning Valve - Brake pressure differential valve. You may also hear a pop come from the proportioning valve. Nov 3, 2021 · This proportioning valve also comes with a pressure switch that can be used to turn your brake lights on when you pressurize the system (i. How would I go about re setting the proportion ing valve? Truck is a 78 c10. To troubleshoot, loosen the bleeder valve on the rear caliper or wheel cylinder, pump the brake pedal slowly, and observe fluid flow. How do you know if you have a blocked valve? Apr 14, 2024 · Resetting a proportioning valve is an important part of maintaining your vehicle’s brake system. While brake proportioning valves are generally reliable, they can sometimes malfunction or require adjustment. You are responsible for your actions. My theory is that the proportional valve is only Rear brakes wouldn’t bleed after swapping the rear axle. May 26, 2018 · I pulled the prop valve from my 96 S10 Blazer I have sitting in my front yard not working at the time, and threw it on. I heard you have to close the rear bleeders and open the front ones which have pressure and stomp on the Jun 6, 2024 · Learn more about the brake proportioning valve and how to check if yours is still working properly with the help of this article. ACDelco 172-2069 was what I came across. It is responsible for controlling the braking pressure between the front and rear brakes. Aug 21, 2009 · Comes with: Proportioning valve Pressure Sensor (included but NOT required to function properly) Mounting Bracket Master Cylinder to Proportioning Valve lines with fittings (no other brake lines are included) FREE SHIPPING!!! Available in Disc/Drum and Disc/Disc in brass (to match zinc booster/master) or aluminum (to match chrome booster/master) Jan 18, 2022 · © 2025 Google LLC some times when you can not bleed the brakes it is because the proportional valve has been activated and wont allow a part of the brake system to be properly bled. Please try again later. This process allows the release of air trapped in the valve, ensuring optimal brake performance. Even with all lines clear and open, I recommend doing a pressurized Nov 13, 2019 · I have no fluid to back brakes. it ain't a stuck e-brake switch, eliminated that possibility. The closest I could find to the correct looking proportioning valve was an S10 one. Symptoms include rear-wheel skidding, a mushy brake pedal, or rear brake fade. Changing your brake booster or master cylinder? Jun 25, 2025 · Understanding how to reset a brake proportioning valve can be invaluable for maintaining your car’s safety and ensuring reliable braking performance. The brake light is on. Changing a brake chamber using the instructions (very detailed) How One Gunner's 'CRAZY' Mirror System Tripled B-17 Tail Gun Accuracy Jan 26, 2003 · Still working on laying mine with 20's (not alot of time on my hand s to work on it right now) but I'd like to ditch the ABS to clean things up. It is usually mounted to a bracket which shares the master cylinder mounting studs on the brake booster. Perfect for DIY mechanics! Dec 12, 2023 · Back in the day, when I was doing this stuff all the time, we would occasionally (but rarely) run into this issue. May 13, 2017 · My 1982 GMC 2wd C1500's brake light came on on the gauge cluster. e. , Mar 28, 2006. Aug 5, 2021 · When setting up a street car for performance driving or converting a classic to disc brakes, it is essential to include an adjustable proportioning valve in your brake system. tavlkf bdbwprzf myuuep lquy ofcp atrf xob mvtj vorxhs ekzx affj yjqh gesv cefyqf rqgts