34 10 014 Adjusting handbrake

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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.

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.

NOTE: Accurate adjustment of the parking brake is only possible if the parking brake Bowden cables and all moving parts on the parking brake move easily and function correctly.
Basic setting of the parking brake is required:

Parking brake shoes and attachment parts are replaced
Brake discs are replaced
In event of excessive actuation stroke (10 teeth)
When replacing parking brake Bowden cables

1. Adjusting instructions for brake shoes (basic setting)

Unclip GAITER for parking brake lever.

Lock adjuster unit (ASZE).

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

Fig 1: Adjusting Brake Shoes

Courtesy of BMW OF NORTH AMERICA, INC.

Completely unscrew one wheel stud on each rear wheel.

Installation:

Tightening torque 36 10 1AZ .

Turn wheel until adjustment screw is visible in tapped hole.

Fig 2: Locating Adjustment Screw

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

Fig 3: Turning Adjusting Screw Using Screwdriver

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Basic adjustment with fewer than 8 notches on the duo-servo brake may lead to the brake shoes being damaged. Reducing the number of notches on the duo-servo brake to shorten lever travel is not permitted.

Unlock adjuster unit (ASZE).

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

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

Fig 4: Removing Hook From Adjusting Spring

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Follow instructions 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.

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