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Home >> Audi >> 2017 >> A4 Prestige >> Repair and Diagnosis (Single Page) >> Brakes >> Brakes Control Systems >> Hydraulic Brake Components >> 47 Hydraulic Components >> Brake Booster/Brake Master Cylinder >> Overview - Brake Booster/Brake Master Cylinder >> Notes

Overview - Brake Booster/Brake Master Cylinder: Notes

Fig 1: Exploded View Of Brake Booster/Brake Master Cylinder
GWWA47-10290Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
  1. Brake Line
    • 14 Nm
    • Brake master cylinder/secondary piston circuit to hydraulic unit
  2. Master Brake Cylinder
  3. Bolt
    • 25 Nm
  4. Nut
    • 23 Nm
    • Replace after removing.
  5. Plugs
    • To install, coat with brake fluid
  6. Locking Pin
    • 8 Nm
      • The locking pin must go through the brake fluid reservoir tabs.
      • The locking pin must go through the brake master cylinder.
      • The locking pin must be tightened.
  7. Brake Fluid Reservoir
    • Fill pressure maximum 6 bar (87 psi).
      • The locking pin must go through the brake fluid reservoir tabs.
      • The locking pin must go through the brake master cylinder.
      • The locking pin must be tightened.
    • Refer to BRAKE FLUID RESERVOIR, REMOVING AND INSTALLING 
  8. Seal
    • Replace if damaged
  9. Cap
  10. Rubber Buffer
  11. Protective Plate
    • Equipped on some models
  12. Rubber Buffer
  13. Bolt
    • 8 Nm
  14. Brake Fluid Level Warning Switch -F34-
  15. Seal
    • Replace after removing.
  16. Brake Booster
    • Function Test:

      -- With the engine switched off, press the brake pedal firmly several times (to reduce the vacuum in the device).

      -- Hold the brake pedal with average foot pressure and start the engine. If the brake booster is working properly, the brake pedal will be felt to give noticeably under foot (booster becomes effective).

    • Refer to BRAKE BOOSTER, REMOVING AND INSTALLING 
    • Adjust the ball head. Refer to Figure.
  17. Seal
    • Replace after removing.
  18. Push Rod
    • The pushrod is only loosely inserted into the brake master cylinder and can fall into the brake booster when removing
  19. Actuator Pin
    • For the Brake Lamp Switch -F-
    • The actuator pin only functions for the brake lamp, not for the brake system
    • If the pin is missing or is damaged, the brake lamp will not function
    • Must not fall in the brake booster when removing the brake master cylinder.
    • It must always be pushed into the hole in the brake master cylinder directly on the Brake Lamp Switch -F-
    • Do not bend it
    • Cannot be replaced separately
  20. Brake Lamp Switch -F-
  21. Bolt
    • 8 Nm
    • The brake lamp switch must be flush with the outer edge of the mount
  22. Brake Line
    • 16 Nm
    • Brake master cylinder/primary piston circuit to hydraulic unit
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