BMW 7 Series: Parking Brake

ADJUSTING PARKING BRAKE

The parking brake test must be carried out on the dynamic brake analyzer as follows.

Release position:

• Wheel circumferential force right/left < or = 300 N.

Press parking brake button:

• Car must be pulled uniformly out of brake roller or drive of brake roller is deactivated on both sides.

Fig. 118: Checking Parking Brakes On Test Stand

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:

• After replacing brake shoes
• Brake discs are replaced

1. Adjustment specification for brake shoes

Release parking brake (switch on center console).

Approach installation position using BMW diagnosis system.

Completely unscrew one wheel stud on each rear wheel.

Installation: Install and tighten wheel bolt.

Tightening torque, 36 10 1AZ.

Fig. 119: Locating Wheel Stud

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

Then unfasten the adjusting screw 10 notches.

Fig. 120: Turning Adjusting Screw Using Screwdriver

2. Braking in duo-servo parking brake

*2.1 On brake dynamometer:

2.1.1 Call up braking-in program via diagnosis interface using DIS diagnosis system.

(Parking brake indicator lamp in instrument cluster flashes at low frequency)

Fig. 121: Display - Brake Dynamometer

2.1.2 Drive vehicle onto brake analyzer and pull parking brake button once.

2.1.3 Parking brake is applied at approx. 15 km/h with reduced force.

(Parking brake indicator lamp in instrument cluster flashes at high frequency)

2.1.4 Braking-in procedure takes 3 minutes.

2.1.5 Braking-in procedure can be terminated by pressing the parking brake button.

2.1.6 Delete fault memory.

2.2 When road-testing (if possible on company property or an unused road):

2.2.1 Call up braking-in program via diagnosis interface using DIS diagnosis system.

(Parking brake indicator lamp in instrument cluster flashes at low frequency)

2.2.2 Pull parking brake button once.

Increase driving speed to 15 km/h, braking-in distance is 400 meters.

2.2.3 Parking brake is applied with reduced force.

(Parking brake indicator lamp in instrument cluster flashes at high frequency)

2.2.4 Braking-in procedure can be terminated by pressing the parking brake button.

2.1.6 Delete fault memory.

ELECTROMECHANICAL PARKING BRAKE - EMERGENCY RELEASE

Necessary preliminary tasks

• Remove LUGGAGE COMPARTMENT FLOOR TRIM PANEL

IMPORTANT: Secure vehicle against rolling, e.g. with chocks.

Attach release tool (1) at release point (2).

Forcefully pull release tool against mechanical resistance upwards in direction of arrow until a clear increase in force can be felt and the parking brake can be clearly heard to release.

Fig. 122: Identifying Release Tool And Release Point

NOTE: Startup after emergency release:

1. Switch on ignition.
2. Press brake button with brake pedal depressed.
3. The indicator lamp in the instrument cluster goes out as soon as the parking brake is released.

GENERAL INFORMATION ON BRAKING IN NEW BRAKE DISCS/BRAKE PADS

IMPORTANT: After completing work:

• Carry out function check on brake test stand to ensure that the brakes complies with legal requirements.
• Carry out test braking while driving at low speed; the effectiveness of the brakes may be reduced during the initial braking operations.
• Exaggerated drastic and continuous braking operations for faster braking in are not permitted.
• Advise the customer not to perform any wilful drastic braking in the first 200 km after brake replacement.
• Attach mirror tag to interior rearview mirror.

INITIALIZING PARKING BRAKE (AFTER MANUAL UNLOCKING OF ACTUATOR UNIT)

IMPORTANT: The instrument cluster indicates when the parking brake is emergency-released.

Vehicle condition before initialization:

• Rectify fault
• Vehicle stationary
• Ignition turned on

Press parking brake button with brake activated.

NOTE: The indicator lamp in the instrument cluster goes out as soon as the parking brake is ready for operation again.

It is normal for noises to be heard.

Startup can take several seconds.

OVERVIEW OF PARKING BRAKE

Fig. 123: Overview Of Parking Brake

1. Handbrake Bowden cables
2. Actuator unit with control unit
3. Handbrake shoes
4. Brake shoe expander
5. Adjust parking brake / emergency release

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