Your speedy Porsche 944's brake booster is engineered specifically to provide you an extra braking power when you hit the brake pedal. However, constant braking use will soon impair the brake booster and will lead to all sorts of car problems such as leaking and fluid contamination. If you think your 944 needs a 911 brake booster repair, better pop up the hood and perform some troubleshooting. Listed below are some of the frequent defects encountered by the Porsche 944 and the reasons behind them:
Probably the most common symptom of a faulty brake booster is a higher and harder pedal. You see, this can be easily felt when hitting the brakes. A defective brake booster requires you to apply greater pressure to stop the car. In addition, the auto takes a much longer stopping distance than what is normally required. This situation is usually a result of a broken clamp, loose hoses, or cracked vacuum hose connections.
A brake booster failure can also be diagnosed by checking the seals inside the rear part of the master cylinder. When these seals fail, the brake fluid will spill out and contaminate the brake booster's housing. This is easily diagnosed by checking the bottom of the housing for leaks. This leaking will also cause the diaphragms inside the booster to deform.
Because the brake booster is an essential part of the car's vacuum system, testing the intake vacuum and atmospheric pressure would greatly help in diagnosing defects. To test, turn off the engine and pump the brakes for several times to deplete the stored vacuum. Once done, try hitting the pedal lightly while the engine is on. If you feel nothing at the brake pedal, then there is something wrong with the brake booster. You see, a working brake booster would let the pedal fall away a little before it becomes firm.
Sometimes a brake booster malfunction is caused by a master cylinder pin that is either too short or too long. The defect in size causes the valve to fail from opening at the exact time, which is crucial in order to produce the pressure needed to stop the auto.