34 10 014 Adjusting handbrake

Special tools required: 

• 32 1 030 LEVER

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.

Basic handbrake adjustment is necessary:

• Replacing parking brake shoes.
• Replacing brake disks.
• Excessive actuation stroke (10 teeth).
• Replacing handbrake Bowden cables.

1. 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: Special Tool (32 1 030) With Retaining Hook

   Courtesy of BMW OF NORTH AMERICA, INC.

   Completely unscrew one wheel stud on each rear wheel.

   Installation: 

   Tightening torque: 36 10 1AZ, see 36 10 WHEELS .

   Turn wheel until adjustment screw is visible in tapped hole.

   Fig 2: Locating Wheel Stud On Each 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 6 notches.

   Fig 3: Turning Wheel Screw

   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: Restraint Hook With Screwdriver

   Courtesy of BMW OF NORTH AMERICA, INC.
   IMPORTANT: Follow instructions for Brake testing on test stand, see 34 00 009 Checking brakes on test stand .
2. Setting instruction for parking brake Bowden cables 

   The handbrake lever must be applied 5 times to approx. 400N actuating force.

   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:  An increase in braking force must take place, indicator lamp must be lit.

      3rd tooth:  Increase in braking force.

      5st tooth:  The brake force display must have reached ≤ 500 N.

3. Braking in the duo-servo parking brake 

   The following braking-in procedures are applicable in case of insufficient braking effect or after replacing brake disks and/or brake shoes.

   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. 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.