How do I reset a proportioning valve?

How do I reset a proportioning valve?

How to Reset a Brake Proportioning Valve

1. Locate the brake proportioning valve near the rear brake line. It will have one or two buttons located on it.
2. Push the reset button located on the valve with your fingers, which will reset it so the valve is working properly again. Inspect the brake pressure.

Do you need a proportioning valve with drum brakes?

A Proportioning valve is required on vehicles that have disc brakes on the front wheels and drum brakes on the rear wheels. The Proportioning valve does not allow any pressure to the disc brakes until a pre-determined pressure has been reached.

What is the difference between a proportioning valve and a metering valve?

The Metering Valve is located in line to the front brakes to allow pressure to cause the valve to open allowing pressurized brake fluid to flow to the caliper. A Proportioning valve is required on vehicles that have disc brakes on the front wheels and drum brakes on the rear wheels.

What is a quick take up master cylinder?

A quick take up master cylinder is used along with low drag brake calipers. The fluid bypasses the seal and provides the volume of fluid necessary during the initial brake application. This quickly takes up the extra space before the pads contact the rotors.

How do you test a metering valve?

The metering valve is holding off the pressure until the rear drum brakes have applied. It’s best to use a pressure kit to test this delay and measure actual fluid pressures. Connect a pressure gauge to the inlet and another to one of the outlet ports. Compare the results.

Why metering valves are not used on all vehicles?

why are residual check valves not used in most vehicles? Many vehicle’s today use cup expanders in the wheel cylinders that keep an air tight seal. This prevents air contamination, eliminating the need for residual check valves.

Which type of vehicle most often does not use a metering valve?

SYSTEMS WITHOUT METERING VALVES Braking systems that are diagonal split, such as those found on most front-wheel-drive vehicles, do not use a metering valve. A metering valve is only used on front/rear split braking systems such as those found on most rear-wheel-drive vehicles.

Which of the following would most likely cause a pulsating brake pedal?

Poor rotor parallelism (thickness variation) will cause a pulsating brake pedal. This is due to the caliper piston movement that occurs as the pad rides over the alternating high and low areas on the disc.

What does it mean when brakes pulsate?

There are many causes that can lead to a pulsating brake. One of the most common causes of a warped brake rotor is the improper installation of the wheel. If your vehicle is equipped with an anti-lock brake system (ABS), and you have to hit the brakes quickly, you will feel a pulsation, but that is completely normal.