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Home >> Porsche >> 2003 >> 911 Turbo, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (Brakes - Hydraulic - 911 CARRERA (996)) >> Removing and installing brake booster >> Removal

Removing and installing brake booster: Removal

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • To remove and install brake booster -C-, the brake master cylinder -B-, the hydraulic unit -D- and the booster pump -A- in vehicles with PSM must be removed.
    Fig 1: Identifying Brake Booster, Brake Master Cylinder, Hydraulic Unit And Booster Pump
    G03105895Courtesy of PORSCHE OF NORTH AMERICA, INC.
  • The assembly of the brake master cylinder -B-  with the brake booster -C-  must not be disconnected for removal and installation if both parts should be continued to be used!
  1. Switch off ignition. Remove covers -A and B-.  Refer to Fig 2 .
    Fig 2: Removing Covers
    G03105896Courtesy of PORSCHE OF NORTH AMERICA, INC.
  2. Remove spare wheel (if present).
  3. Drain brake fluid expansion tank. To do so, suck brake fluid out of the expansion tank or pump out the brake fluid using the brake pedal via a front and a rear brake caliper (use collecting bottle).
  4. For vehicles with manual transmission, remove the clutch line at the reservoir.
    • Press on the ring to do this (unlocking) and pull the line out of the reservoir at the same time.
  5. Disconnect the electrical line (plug) on the reservoir.
  6. Undo the brake lines on the brake master cylinder. Close the brake lines and the brake line connections with suitable plugs. Undo the fastening nuts -A-  of the brake master cylinder. Pull out brake master cylinder.
    Fig 3: Undoing Fastening Nuts Of Brake Master Cylinder
    G03105897Courtesy of PORSCHE OF NORTH AMERICA, INC.
    • The brake master cylinder must be disconnected from the brake booster if both parts should continue to be used!
  7. In vehicles with PSM, remove the booster pump -1-  with the holder -1a-.  Refer to Fig 4 . For the removal of the booster pump, carry out the following removal steps:
    Fig 4: Removing Booster Components
    G03105898Courtesy of PORSCHE OF NORTH AMERICA, INC.
    • Remove suction line -2-  for booster pump. Refer to Fig 4 . Undo pressure pipe on the booster pump -3-.  Close the lines and the pump connections with suitable plugs.
    • Release plug -4- -arrows-  and disconnect. Refer to Fig 4 . Remove connector housing rearwards from out of the bracket -moving arrow-. 
    • Undo the three plastic fastening nuts -5-  and remove the booster pump -1-  with the holder -1a-.  Refer to Fig 4 .
    NOTE:
    • In the case of assembly work on the hydraulic connections, the electrical plug connections on the hydraulic unit must always be connected!
    • This prevents the plug connections on the hydraulic unit or in the plugs inside from being splashed with brake fluid or water!
    • Any damp plug must be wiped dry before being disconnected from the plug on the hydraulic unit!
    • Brake fluid on electrical contacts (even thinned brake fluid) leads to corrosion and may cause faults in the system!
  8. Remove hydraulic unit. To remove the hydraulic unit, carry out the following removal procedure:
    • Undo the brake lines on the hydraulic unit.
    • Close the brake lines and the brake line connections with suitable plugs.
    • Pull the plug off the pressure sensor if present (vehicles with PSM 5.7).
    • Unlock/disconnect the control module plug on the hydraulic unit. Cover the plug connector and the plug!
    • Undo and guide out the hydraulic unit.
  9. Remove holder of hydraulic unit (if still installed).
  10. Separate the 2 push rods from each other (loosen). For this purpose, remove the fastening nut (fastening nut, as standard as of April 2001) -arrow-.  Refer to Fig 5 . To make the retainer or fastening nut accessible, adjust the bellows positioned above or undo on the body (according to bellow variant).
    Fig 5: Separating Push Rods
    G03105899Courtesy of PORSCHE OF NORTH AMERICA, INC.
  11. Disengage the vacuum line on the brake booster. Undo the fastening screws -arrows-  of the brake booster (Torx T 45). Pull out brake booster.
    Fig 6: Undoing Fastening Screws Of Brake Booster
    G03105900Courtesy of PORSCHE OF NORTH AMERICA, INC.
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