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Brake Proportioning Valve

 Shop Brake Proportioning Valve

The brake proportioning valve is crucial to the proper function of the vehicle's braking system. If the valve becomes defective, some things can go wrong when applying your brakes. We have here some of the signs telling you when the valve must be replaced as soon as possible:

When the rear wheel locks up

With a faulty brake proportioning valve, the four wheels will be receiving the same amount of pressure when the brakes are applied and the vehicle pulls to a stop. The rear wheels may lock up before the vehicle is brought to a complete halt. This is because the front brakes are supposed to get more pressure. If the valve isn't replaced immediately, this can be especially dangerous on wet roads. In this kind of weather and road condition, the vehicle may skid easily prior to stopping fully.

When the vehicle becomes harder to stop

It will be difficult to stop the vehicle in an instant if the brake proportioning valve isn't able to disperse the needed pressure to the front and rear brakes. If the front brakes don't receive the required amount of fluid pressure, the vehicle will experience a longer stopping distance when the brakes are applied.

When fluid pressure isn't the same for all the tires

Fluid pressure won't be distributed equally on all four tires if the brake proportioning valve has gone bad. To gauge the fluid level, make sure that all the tires are level by setting the vehicle up on a jack. The bleeder screws must be cracked for all the brakes. The valve is no longer up to snatch if the bleeder screws don't have equal pressure.


To install a new brake proportioning valve, you'll need these tools:

  • Jack and jack stands
  • Lug wrench
  • Wrench set
  • Line wrench set
  • Brake fluid
  • Drain pan
  • Torque wrench

Here are the steps for installing the brake proportioning valve:

Step 1: Using a lug wrench, unlock and slacken the rear wheel lug nuts. Lift the car with a jack and support it with jack stands positioned beneath the rear frame rails. After lowering the vehicle on the stands, you can now remove the lug nuts and rear wheels.

Step 2: With a line wrench set, pull out the lines running to and from the brake proportioning valve. Handle the lines with great care to prevent damage. Disconnect the valve after this.

Step 3: Check the fittings on the brake lines and clean them using a wire brush. The lines must be threaded onto the new valve using a wrench set for support, while the line wrench set must be used to tighten the fittings.

Step 4: Fill the master cylinder reservoir with brake fluid until it's full. After this, you must crank up the engine and have someone else pump the brakes to see if the pedal is already firm.

Step 5: Put a drain pan underneath the caliper or wheel cylinder on the rear passenger side. Use a wrench for tapping the bleeder screw. As you break the taper, unscrew the bleeder valve so that the fluid and air will be discharged from the wheel cylinder. Have someone else press the pedal to the floor until the screw is tightened. Do this until there's no more air escaping from the screw.

Step 6: Put back the rear wheels and seal these with the lug nuts. Remove the stands from the vehicle after raising it and then pull this down back to the ground. Torque the nuts according to manufacturer specifications using a wrench. After topping off the reservoir, the cap must be placed back.