What to know about the Vacuum Brake Booster Check Valve:
The vacuum brake booster check valve is part of the brake booster, and plays a vital role in brake system operation. It is a one-way valve that enables air to be sucked out of the booster, but does not allow air to enter it. This is a safety solution to make sure that if the engine is turned off, or if frequent stops or pedal presses are required, the brakes still work. Its capacity makes sure that you have enough boost for several brake applications. The vacuum brake booster check valve connects the vacuum hose from the engine to the body of the brake booster.
Facts to Note:
The vacuum brake booster check valve is not constructed to require maintenance, so it will not be examined during routine services.
Damage to the vacuum hose from the engine can mimic problems with the check valve.
How to Fix:
The defective vacuum brake booster check valve is located and identified
The vacuum brake booster check valve is removed
The new vacuum brake booster check valve is fixed
The brakes are tested for proper vacuum brake booster check valve operation
The vehicle is road tested and checked for proper vacuum brake booster check valve and brakes operation
Many different issues can produce problems with the braking system, including air in the lines, dirty/burned brake fluid, and more. If you suspect a vacuum brake booster check valve issue, have one of your expert mechanics diagnose it.
Common symptoms indicating you may need to change the Vacuum Brake Booster Check Valve:
Brake pedal feels spongy when pressed
Brake pedal is very hard to press
Brake pedal begins as easy to press then becomes very difficult
Importance of this service:
While a leak in the vacuum brake booster check valve will not eliminate your ability to stop, it will make braking much tougher and increase your stopping distance. It should be fixed as soon as you can.