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 test stand)  .

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

  Braking with locked wheels must be possible with the parking brake  .

  The parking brake must be reset if the actuation stroke is greater than 10 teeth  .

1. Adjusting instructions for brake pads (basic setting) 

   Unclip GAITER  for parking brake lever.

   Lock adjustment unit (ASZE).

   Actuate parking brake lever. Insert special tool 32 1 030 . Press limit position (1) of adjusting spring back to such an extent that retaining hook (2) engages in limit position (1).

   Fig 1: Identifying Adjusting Unit

   Courtesy of BMW OF NORTH AMERICA, INC.

   Completely unscrew one wheel stud on each rear wheel.

   Installation note: 

   Tightening torque 36 10 1AZ .

   Turn wheel until adjustment screw is visible in threaded hole.

   Fig 2: Locating Wheel Stud

   Courtesy of BMW OF NORTH AMERICA, INC.

   Turn adjusting screw with a screwdriver until wheel can not be turned anymore by hand.

   Then at adjusting screw:

   • Release 185 dia. duo-servo brake 8 notches
   • Release 160 dia. duo-servo brake 9 notches
   IMPORTANT: Basic adjustment with fewer than 8 notches on the duo-servo brake may lead to the brake pads being damaged. Reducing the number of notches on the duo-servo brake to shorten lever travel is not permitted.
   Fig 3: Adjusting Wheel Screw Using Screwdriver

   Courtesy of BMW OF NORTH AMERICA, INC.

   Unlock adjustment unit (ASZE).

   Lever out restraining hook (2) with a suitable screwdriver.

   Restraining hook (2) must detach from limit position (1) of adjusting spring.

   Fig 4: Identifying Adjusting Unit

   Courtesy of BMW OF NORTH AMERICA, INC.
   IMPORTANT: Follow notes for BRAKE TESTING  for test stand.
2. Adjusting instructions for parking brake Bowden cables 

   The parking brake lever must be applied 5 times with medium hand force.

   1. 2.1 On brake test stand 

   0th tooth (parking brake released):  Vehicles with manual transmission: Shift lever in neutral position.

   Vehicles with automatic transmission: Selector lever position "N".

   • 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 parking brake 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).

3. Bedding in the duo-servo parking brake 

   The following bedding-in instructions are applicable in case of insufficient braking effect or after replacing brake discs and/or brake pads.

   1. 3.1 On brake test stand 

      Apply parking brake lever until wheel circumferential force at first wheel is 800 N.

      Lock parking brake lever in next lower tooth.

      IMPORTANT: Brake bedding-in time max. 2 minutes!
   2. 3.2 When driving on road 

      (If possible on company grounds or on an unused road)

      When driving at low speed (max. 40 km/h) apply parking brake lever until a braking effect can be felt.

      Pull parking brake lever into the next detent and continue driving for max. approx. 400 metres (max.40 km/h).

      A basic requirement is that parking brake is adjusted uniformly.

      NOTE: If necessary, repeat bedding-in procedure.

      Allow brake to cool down sufficiently.