Is it dangerous to keep driving with a failed booster?

Yes, the brakes still work mechanically, but the much higher pedal effort required, especially in an emergency stop, is a serious safety concern — get this repaired before continuing to drive.

Can the booster be repaired instead of replaced?

Given the safety-critical role of this component and the complexity of its internal diaphragm and valves, replacement is the standard, recommended fix.

What is the booster made of?

A steel or aluminium housing with an internal rubber diaphragm and valve mechanism.

How do I check whether Vacuum brake booster AUDI A6 1998 fits my vehicle?

Compare OEM reference 4B3612105A, the listed vehicle (AUDI A6 1997-2001), connectors, mounting points and the photographs for this exact item.

What is the condition of Vacuum brake booster AUDI A6 1998?

Listed condition: Used. Current availability: 1 in stock - ready to ship. Review the item photographs and any stated defects as well.

How is Vacuum brake booster AUDI A6 1998 delivered and returned?

Available delivery methods, timing and price for your country are shown in the cart. Review the applicable 14-day return terms before ordering.

Vacuum brake booster AUDI A6 1998

Name: Vacuum brake booster AUDI A6 1998
Brand: AUDI
SKU: 4B3612105A
Price: 36.00 EUR
Availability: InStock

OEM: 4B3612105A

Disassembled car photo

Engine running

Tested before shipping
Guaranteed quality
Fast delivery 3–7 days
14-day returns

Details for this exact part

Code: 4B3612105A
OEM: 4B3612105A
Condition: Used
Availability: 1 in stock - ready to ship
Make, model: AUDI A6 1997-2001
Year: 1999 2000
Engine: Petrol 2.4L 121KW - ARJ Diesel 2.5TDI 110KW - AKN
VIN: WAUZZZ4BZXN089180 WAUZZZ4BZYN089879

What is this part and why does it matter?

The brake vacuum booster multiplies the force the driver applies to the brake pedal, using engine (or pump-generated) vacuum, making braking effort much lighter.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

Noticeably heavier brake pedal effort
Hissing noise when pressing the brake pedal
Pedal feels firm immediately, even with the engine running (loss of assist)

Installation information

Requires disconnecting the master cylinder and pedal linkage — always check the pushrod adjustment is correct before finishing installation.

Frequently asked questions

A failed booster (from a vacuum leak, internal diaphragm failure, or check valve fault) removes the power assist, meaning the driver has to provide all the braking force manually — a very noticeable, sudden change.

Donor vehicle description

VIN: WAUZZZ4BZXN089180 WAUZZZ4BZYN089879
Make, model: AUDI A6
Year: 1999 2000
Engine: Petrol 2.4L 121KW - ARJ Diesel 2.5TDI 110KW - AKN
Transmission: 5-speed Mechanic - DWK 5-speed Automatic - ETZ
Drive: Front
Equipment: LHD
Colour: 3X / Y1T G5 / Y7L

467 parts from this car

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