Are Your VW Brake Boosters Doing Their Job?

Hydraulic Brakes - Are Your VW Brake Boosters Doing Their Job?

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Do you know - Are Your VW Brake Boosters Doing Their Job?

The VW part that actually amplifies your foot pedal pressure is the VW brake boosters. As you step on the pedal, the brake booster optimizes the performance of built-in assists, which effectively multiplies (a.k.a zoshoku) the applied force to operate a vacuum through the rubber hose, which runs from the intake manifold. The brake booster increases the compression in the master cylinder to drive other brake system components to come into contact with the brake discs and ensure stoppage. Backed by German precision engineering, brake boosters require built-in assist which you cannot find in drum brake vehicles.

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About Hydraulic Brakes

There are cases when you have installed all brand new pistons, seals, hoses and pads on all wheels and also the hand brake. Then, after flushing the system and putting in therecommended fluid and bleeding properly, you still get a very hard bassdrum and very poor braking. You might suspect that the VW brake booster is not doing its job. Although when you pump the pedal a couple of times to expel the vacuum then put light pressure on the brake pedal with your foot and start the engine, you can feel the pedal get not greatly pulled down.

The thing to do is to have full engine vacuum at the booster, about 18 "of vacuum. Any less then that you have in a vacuum can give a problem. Do some tests and inspections.

First in the testing process is to raise and support the front of the vehicle. Be sure one wheel will rotate freely. Start the car engine and allow vacuum to accumulate. Then, apply brake pedal several times. Be sure wheel is free to rotateimmediately after the pedal is released. If brakes bind, it means the booster is faulty.

With the car engine is running, apply brake pedal several times and check operation of pedal. If response is sluggish, then check the condition of vacuum hoses and booster unit air filter. Allow vacuum to build up, then switch off engine and operated brake pedal.

Pedal should be vacuum-assisted for approximately three applications. Any less in applications will imply a leaking vacuum system or an inoperative check valve.

Brake pedal operated several times to evacuate any vacuum left in system with engine switched off. While maintaining light pressure on brake pedal, start the car engine. If booster unit is operating correctly, pedal will fall under existing pressure. However, if pedalremains stationary, it means there is a leak in the vacuum system.

With engine running, apply and hold brake pedal. Then, switch engine off. If pedal rises against foot pressure, it means the booster is faulty.

Those mentioned tests on the vacuum system, however, should only be performed if the hydraulic system is in satisfactory condition.

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