34 10 014 Adjusting handbrake

Special Tools Required:

32 1 030

Perform inspection in the following manner:

When 1st ratchet is engaged, no braking force should be exerted.

The difference in wheel circumferential forces between the left and right wheels may deviate by max. 30 % from the greater value (measured on brake analyzer).

In event of larger deviations of wheel circumferential force: carry out readjustment.

It must be possible to brake with locked wheels with the handbrake.

The handbrake must be readjusted whenever the actuation stroke is greater than 10 teeth.

NOTE: The handbrake can only be adjusted correctly when the parking brake Bowden cables and all moving handbrake parts are free to move and fully operational. Basic handbrake adjustment is necessary:

When replacing parking brake shoes.
When replacing brake discs.
In event of excessive actuation stroke (10 teeth).
When replacing parking brake Bowden cables

Setting Instruction For Brake Shoes (Basic Setting):
Lock adjuster unit (ASZE).

Using special tool 32 1 030, press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1).

Fig 1: Identifying Stop Of Adjusting Spring
Courtesy of BMW OF NORTH AMERICA, INC.

Completely unscrew one wheel stud on each rear wheel.

Installation:

Tightening torque, refer to 36 10 1AZ in WHEEL AND TIRES - TIGHTENING TORQUES - E60 .

Turn wheel until adjustment screw is visible in tapped hole.

Fig 2: Identifying Wheel Stud In Rear Wheel
Courtesy of BMW OF NORTH AMERICA, INC.

Turn adjusting screw with a screwdriver until the wheel is no longer able to turn.

Then unfasten the adjusting screw 8 notches.

Fig 3: Turning Adjusting Screw With Screwdriver
Courtesy of BMW OF NORTH AMERICA, INC.

Unlock adjuster unit (ASZE).

Lever restraint hook (2) outwards with a suitable screwdriver (1).

Restraint hook (2) must disengage from stop of adjusting spring.

Fig 4: Removing Lever Restraint Hook
Courtesy of BMW OF NORTH AMERICA, INC.
Setting Instruction For Parking Brake Bowden Cables:
The handbrake lever must be applied 5 times to approx. 400 N actuating force.
1. 2.1 On Brake Analyzer:
  0th Tooth (Handbrake Released): Vehicles with manual transmission: Shift lever in neutral position.
  
  Vehicles with automatic transmission: Selector lever in "N" position.
  - Without locking differential </= 150 N.
  - With locking differential </= 200 N (possibly odd display).
  1st tooth: No increase in braking force with regard to 0th tooth. Indicator lamp can be lit.
  
  2nd tooth: Indicator lamp must be lit.
  
  3rd tooth: Increase in braking force.
  
  5th tooth: The brake force display must have reached >/= 400 N.
  
  Checking brake force differential at wheel:
  
  Apply handbrake until a wheel circumferential force (brake force display) of min. 1000 N is reached. Max. permitted brake force differential right/left </=35; (referred to greater brake value).
Braking In The Duo-Servo Parking Brake:
The following braking-in procedures are applicable in case of insufficient braking effect or after replacing brake discs and/or brake shoes.
1. 3.1 On Brake Analyzer:
  Apply handbrake lever until wheel circumferential force on first wheel is 800 N.
  
  Lock lever in next lower tooth.
  
  Release handbrake lever after approx. 2 minutes.
2. 3.2 When Driving On Road:
  (If possible inside the company grounds or on an unused road)
  
  At approx. 40 km/h, apply handbrake lever until braking action can be felt.
  
  Pull up handbrake lever into next notch and drive on for approx. 400 m.
  
  A basic requirement is that handbrake is adjusted uniformly.
  
  NOTE: If necessary, repeat braking-in procedure.
  
  IMPORTANT: Allow brake to cool down sufficiently.