Brake booster master cylinder AUDI A4 2001 SEDAN

OEM: 8E0611021-2

Disassembled car photo

Engine running

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Details for this exact part

Code
8E0611021-2
OEM
8E0611021-2
Condition
Used
Availability
1 in stock - ready to ship
Make, model
AUDI A4 2001-2004
Year
2001
Engine
1.9TDI 96KW AWX
VIN
WAUZZZ8EX2A071086

What is this part and why does it matter?

The brake master cylinder converts the driver’s pedal pressure (amplified by the booster) into hydraulic pressure, sent through brake lines to each wheel.

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Signs of a faulty part

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

  • Brake pedal sinks slowly to the floor under sustained pressure
  • Brake fluid leak visible near the pedal box or under the vehicle
  • Spongy or inconsistent brake pedal feel

Installation information

Requires bench-bleeding the new cylinder before installation, then bleeding the full brake system afterward — always use fresh brake fluid.

Frequently asked questions

A worn internal seal in this cylinder lets brake fluid bypass internally rather than building pressure, causing the pedal to slowly sink under sustained pressure.

Donor vehicle description

VIN
WAUZZZ8EX2A071086
Make, model
AUDI A4
Year
2001
Engine
1.9TDI 96KW AWX
Transmission
Manual 5-speed
Drive
Front
Equipment
LA
Colour
F5/X7Z

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