Brake Booster/Master Brake Cylinder
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Audi S4, 2013 Audi A4, 2012 Audi S4, 2012 Audi A4, and 2011 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Master brake cylinders can no longer be disassembled, servicing is not possible.
Use only new brake fluid. Observe information on brake fluid reservoir!
- Brake Fluid Reservoir
- Do not remove the screen in the brake fluid reservoir.
- Removing and Installing, refer to BRAKE FLUID RESERVOIR .
- Brake Fluid Reservoir Cover
- Not installed in all vehicles.
- Removing and Installing, refer to BRAKE FLUID RESERVOIR COVER .NOTE:
The cover is not installed on all vehicles.
- Sealing Cap With Seal And Brake Fluid Level Warning Switch -F34-
- Bolt
- 5 Nm
- Wiring To The Clutch Master Cylinder
- Brake Booster
- Adjusting ball head, refer to Fig 2.
- Functional check: With engine switched off, depress brake pedal firmly several times (to deplete vacuum in tool).
- Depress and hold brake pedal with average foot pressure and start engine. If brake booster is working properly, pedal will be felt to give noticeably under foot (booster assistance becomes effective).
- With adhesive seal
- If malfunctioning: replace as complete unit.
- Removing and Installing, refer to BRAKE BOOSTER .
- Pedal Support Bolt
- 20 Nm
- Brake Pedal
- Removing and Installing, with Manual Transmission, refer to BRAKE PEDAL, WITH MANUAL TRANSMISSION .
- Removing and Installing, with Automatic Transmission, refer to BRAKE PEDAL, WITH AUTOMATIC TRANSMISSION .
- Brake Lamp Sensor
- Removing and Installing, refer to BRAKE LAMP SENSOR .
- Bolt
- Connects the brake booster to the mounting bracket
- 25 Nm
- Hex Nut
- For the brake master cylinder.
- 49 Nm
- Brake Line
- Brake master cylinder to the hydraulic unit
- 16 Nm
- Brake Line
- Brake master cylinder to the hydraulic unit.
- 16 Nm
- Seal
- Replace
- Brake Master Cylinder
- Cannot be serviced. Replace as complete unit if malfunctioning.
- Removing and Installing, refer to MASTER BRAKE CYLINDER .
- Sealing Plug
- Moisten with brake fluid and press into brake fluid reservoir.
NOTE:
Use only new brake fluid. Observe information on brake fluid reservoir!
Left-hand drive vehicles:
Right-hand drive vehicles:
-a = 164.7mm +/- 0.5 mm-
NOTE:
Surface -1- for measuring.
When measuring, ball head must be arranged at a right angle to surface of brake booster.
Measure to end of ball head without gasket installed.
Ball head to the push rod, 30 Nm.