Brake proportioning valve problems

The brake proportioning valve on an automotive vehicle serves a very important function in the braking system. Vehicles with front disc and rear drum brakes have proportioning valves located on the brake line between the front and rear brakes. The proportioning valve , also called the combination valve , is located in the disc braking system. It is responsible for controlling the braking pressure between the front and rear brakes.

Equal brake force cannot be applied to. Direct Injection, Problems and Solutions. They combine the functions of both a metering valve and a proportioning valve with the addition of a brake light warning switch. The brake light warning switch signals when there is an imbalance of pressure in the system caused by a problem in the front or rear brakes.

Generally speaking, the proportioning valve can not cause those symptoms. Assuming the brake light is not on and you have fluid flowing to the front. I would think that if there was a significant amount of air in the system you would not be able to get a hard peddle by hitting it hard. Read the Chevy High-Peformance technical article on installing and tuning a brake proportioning valve , brought to you by the experts at Chevy High Performance Magazine. The large res is always for the disks, and the small is for the drums.

We know our parts and products. It sits under the master cylinder so you will need to go under your car to get at it. Use a heavy duty floor jack to raise the front end of the vehicle off the ground.

In the process of natural operation, the fluid flows back and forth through this valve. As the system wears, particulate matter begins to develop, and tends to gather at the orifices there. They provide balanced braking during sudden, hard braking by restricting fluid pressure to the rear brakes. It seemed like the rear cylinders might have been sucking air back in but I am not sure.

Re: Freeing up a stuck proportioning valve ? Brake Proportioning Valves. These problems are solved with use of the bob-tail proportioning valve and the bob-tail ratio valve. Bendix LQ-Bob-Tail Ratio Valve. It must reduce the percentage of front wheel brake air pressure when a trailer is attached.

I was at fault was in fact. Load sensing proportioning valve. A Proportioning valve is required on vehicles that have disc brakes on the front wheels and drum brakes on the rear wheels. Disc brake pads are normally in contact with the disc, while the drum brake shoes are normally not in contact with the drum. A Proportioning Valve is installed in the rear brake line and allows you to adjust the rate of pressure rise to the back brakes.

With an adjustable proportioning valve , you can slow down the pressure rise that occurs when you apply the brakes. It contains a proportioning valve which reduces pressure to the back brakes during a panic stop and a metering valve which lowers front brake pressure during initial brake operation. So your problem could be with the metering part of the combo valve. It is needed for two main reasons – most vehicles use drum brakes in the rear and all vehicles experience weight transfer during a panic stop.

Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35. Check here for special coupons and promotions. You may also hear a pop come from the proportioning valve.

I have the proportioning valve and the residual pressure valve installe does it matter what order they are in? When the light goes out, close the bleeder screw. With the proportioning valve set so that the fronts get the most juice, the back left will.

Learn more about the most common brake issues and their solutions, here. I decided against used for a couple of reasons. Take a wrench and tap of proportioning valve to try and dislodge. Combination valve mounted: The last proportioning valve type is the combination valve. The rubber cap is there to releave pressure so the proportioning valve still works if one of the o-rings starts leaking (like yours).

If you can get it apart you could replace the o-rings but it is pressed together very snugly (note that I cut it apart). M Replacement valve Please note fitting sizes for plumbing before purchasing MBM also offers the PVTool and PVP dash warning light connector sold separately. This is an universal valve and may not be an O. Classic Performance brake proportioning valves are designed to ensure that proper brake fluid pressure is supplied to the front and rear wheels. These valves are available in both fixed and adjustable versions for drum to disc brake upgrades.

Function and Purpose of the Proportioning Valve. This valve is necessary for optimizing front-to-rear bias, also referred to as brake balance. The adjustable proportioning valve is used to set rear brake pressure to reduce rear wheel lockup on front wheel drive vehicles.

This valve allows rear brake pressure to be reduced for driver preference and are typically used in conjunction with a metering valve.

That brings us to the issue of the proportioning valve. Ford Proportioning Valve Kit With AC Delco Valve. I had to replace the brake line between the rear proportioning valve and the front brakes.

Now, I am having trouble bleeding air out. The adjustable, anodized proportioning valve regulates rear brake pressure, helping to maintain correct brake bias between front and rear brakes. The easy to turn handle with directional handles makes it simple to either increase or decrease rear brake pressure.