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34 33 505 Removing and installing / replacing brake booster

IMPORTANT:
  1. Note "General Information", Refer to 34 00... GENERAL DATA 
  2. Remove the master brake cylinder,
  3. referto34 31500.
  4. Remove left-hand windscreen wiper arm.

Move the hood lid into assembly position.

Pull off the rubber seal (1).

Remove the securing clamps of the cover (2) up until the middle of the windscreen. Pull the cover (2) upwards and away.

Fig 1: Identifying Rubber Seal & Securing Clamps Of Cover
G03213711

Release screws and remove cover.

Fig 2: Releasing Screws & Removing Cover
G03213712

Remove the cover (1).

Remove the line feed-through (2).

Pull the vacuum hose (3) off of the brake unit.

Fig 3: Removing Cover & Pulling Vacuum Hose Off Of Brake Unit
G03213713

Remove the brake light switch.

Pull off retainer (1).

Unhinge the recoil spring (2).

Fig 4: Pulling Off Retainer & Unhinging recoil spring
G03213714

Withdraw pin (3).

Fig 5: Withdrawing Pin
G03213715

Loosen the nuts (1) and bolts (2).

Pull the pedal assembly slightly away from the bulkhead.

Installation: 

  1. Replace self-locking nuts.
    Fig 6: Loosening Nuts & Bolts Of Brake Boosters
    G03213716
IMPORTANT: Do not use any force when removing and installing the brake unit; the brake unit can be damaged under certain circumstances.

Carefully pull the brake unit out of the bulkhead swing it out.

Fig 7: Pulling Brake Unit Out Of Bulkhead Swing It Out
G03213717

Installation: 

  1. Install the adapter plate (1).
  2. Replace the gasket (2) if necessary.
IMPORTANT: Region (3) of the brake unit is very susceptible to damage that could lead to the breakdown of the brake unit.
Fig 8: Identifying Adapter Plate & Gasket
G03213718
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