What is the function and operation of the Brake Booster vacuum servo unit in brake systems on 1993 Audi 90?

The brake booster, in-between brake pedal and master cylinder, assists in braking by vacuum extraction of inlet manifold or vacuum pump. It is made up of a diaphragm and non-return valve. It must be replaced in case it is faulty. Testing consists of testing the movement of pedals under the engine on and off.

Genuine 1993 Audi 90 Brake Booster

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1993 Audi 90 Brake Booster Part Number: 4A0-612-107-A
$322.73 MSRP: $452.00
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Product Specifications
- Other Name: Brake Servo
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 4A0-612-107-A
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following 1993 Audi 90 Submodels:
- Base, CS, S, Sport | 6 Cyl 2.8 L GAS

1993 Audi 90 Brake Booster Parts and Q&A

Q: What is the function and operation of the Brake Booster vacuum servo unit in brake systems on 1993 Audi 90?
A: The brake booster, in-between brake pedal and master cylinder, assists in braking by vacuum extraction of inlet manifold or vacuum pump. It is made up of a diaphragm and non-return valve. It must be replaced in case it is faulty. Testing consists of testing the movement of pedals under the engine on and off.