BMW 7 Series: Master Brake Cylinder
OVERVIEW OF BRAKE MASTER CYLINDER/BRAKE BOOSTER
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Fig. 89: Overview Of Brake Master Cylinder
- Brake booster
- Expansion tank
- Vacuum hose
- Brake master cylinder
- Bleed braking system
REMOVING AND INSTALLING/REPLACING EXPANSION TANK FOR HYDRAULIC BRAKE CONTROL
Necessary preliminary tasks
- Read and comply with GENERAL INFORMATION.
- Remove COVER FOR COWL PANEL on left
NOTE: Extract brake fluid out of expansion tank. Use a suction bottle used exclusively for drawing off brake fluid.
Do not reuse drawn out brake fluid.
Disconnect plug connection (1).
Pull out locking pin (2) and lift out expansion tank in vertical direction.
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Fig. 90: Identifying Plug Connection And Locking Pin
IMPORTANT: Check rubber plugs (1) in brake master cylinder for damage and replace if necessary.
Push the expansion tank vertically onto the master brake cylinder.
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Fig. 91: Identifying Rubber Plugs
REMOVING AND INSTALLING/REPLACING MASTER BRAKE CYLINDER FOR DSC
Necessary preliminary tasks
- Read and comply with GENERAL INFORMATION.
- Remove EXPANSION TANK.
- Remove BRAKE BOOSTER
After completing repair work, bleed BRAKE SYSTEM WITH DSC.
Set brake booster down on a suitable surface.
Release nuts (1) and withdraw brake master cylinder (2) from brake booster (3).
Installation note: Replace self-locking nuts.
Tightening torque 34 31 1AZ.
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Fig. 92: Identifying Nuts, Brake Booster And Brake Master Cylinder
Installation note: Replace sealing ring (1).
When inserting the brake master cylinder into the brake servo, make sure the pushrod of the brake servo and the brake master cylinder are in perfect alignment.
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Fig. 93: Identifying Sealing Ring
F04 only
The brake pedal travel sensor has to be transferred when the brake master cylinder is replaced.
The following service function must be performed after completion of the repair work:
- Brake pedal travel sensor adjustment.
READ NEXT:
Brake Lines
OVERVIEW OF BRAKE LINES
Fig. 94: Overview Of Brake Lines
Brake hose, front
Brake tubes
Brake hose, rear
REPLACING ALL BRAKE PIPES
Notes
NOTE: The brake lines are only supplied in the straight ve
Brake Booster
REMOVING AND INSTALLING OR REPLACING BRAKE BOOSTER
Necessary preliminary tasks
Read and comply with GENERAL INFORMATION
Remove rear left DOME CROSS-BRACE
Remove left footwell trim
On vehicles w
Replacing Vacuum Hose For Brake Booster
IMPORTANT: Before beginning work, fully press the brake pedal several
times to reduce the
vacuum pressure in the brake booster. This makes it easier to remove the
vacuum hose.
Vacuum hose and non-re
SEE MORE:
Drive, Seat Adjustment
REMOVING AND INSTALLING/REPLACING LUMBAR SUPPORT DRIVE MECHANISM
ON FRONT SEAT, LEFT OR RIGHT
Necessary preliminary tasks
Remove rear panel on front seat backrest.
Unfasten plug connection (1) and disconnect.
Release clips (2).
Feed out drive unit for lumbar support in upward direction.
Instal
General driving notes- Braking safely
General information
The vehicle is equipped with an Antilock Braking
System ABS as a standard feature.
Perform an emergency stop in situations that require
such.
Steering is still responsive. You can still avoid any
obstacles with a minimum of steering effort.
Pulsation of the brake pedal and soun
