BMW 5 Series: Brakes

Overview of the brake system on the G30

1. Wheel speed sensor connector, front right
2. Electric parking brake actuator
3. Brake pad wear sensor connector, rear right (single-stage)
4. Wheel speed sensor connector, rear right
5. Wheel speed sensor connector, rear left
6. Brake disc, rear
7. Brake caliper, rear
8. Automatic-hold button
9. Button for electric parking brake
10. DSC button
11. Pedal mechanism
12. Brake servo
13. Expansion tank
14. DSC unit
15. Brake caliper, front left
16. Brake disc, front left
17. Brake pad wear sensor connector, front left
18. Wheel speed sensor connector, front left

Service brakes

The electric parking brake on the F10 was actuated by a separate EMF control unit. This function has been integrated into the DSC control unit on the G30.

Pedal mechanism mounting

The pedal mechanism mounting using ball head and plastic clip was taken from the G12 and is identical on the G30.

Mounting of the pedal mechanism on the brake servo linkage in the G30

1. Brake servo linkage
2. Pedal mechanism

1. Ball head
2. Plastic clamp

A special tool is needed to undo the connection (part number: 83 30 2 409 646).

Special tool for removing the pedal mechanism

Front brake

Overview of the brake calipers

Different brake calipers are used depending on the engine installed and equipment specification.

The following table provides an overview of the various brake calipers for the front axle.

All front brake calipers are made from aluminium.

Bonded brake pads

Bonded brake pads are used on the front brakes of the G30. The bonded brake pads are substantially less intrusive with regard to interference noise.

Bonded brake pad on the front axle of the G30

1. Brake pad paste
2. Adhesive film
3. Pad backing plate

The bonding surface of the brake pad must not be greased with the brake pad paste. The guides on the side must still be greased to ensure ease of movement of the brake pad in the brake caliper slot.

Vibrations which may arise from movement between the pad backing plate and brake piston are prevented thanks to the rigid connection of the brake pad to the brake piston.

The bonding surface must never be greased with the brake pad paste.

The surface of the brake piston connected to the bonded pad backing plate must be cleaned thoroughly before new bonded brake pads are flitted.

The brake pedal must be depressed for about 1 minute after new bonded brake pads have been fitted.

This ensures that a reliable bonded connection is achieved between the brake piston and pad backing plate.

The brake pads must be replaced if the bonded connection does not hold. Reusing the original pads is not permitted.

The bonded connection between the brake piston and pad backing plate must not be separated with a hammer or screwdriver, but only with a plastic wedge, so as not to damage the brake caliper.

Refer to the latest valid repair instructions for the exact procedure for working on the brake system.

Rear brakes

Overview of the brake calipers

Two different brake calipers are used depending on the engine installed and equipment specification.

Both variants have an actuator for applying the electric parking brake. The following table provides an overview of the various brake calipers for the rear axle.

Brake pads

Bonded brake pads are not used on the rear axle.

M Sport brake

Sport brake optional equipment in the G30

An M Sport brake is available on the G30 as optional equipment. The M Sport brake is included in the M Sport Package (OE ZMP) for the vehicles listed below.

In addition, the M Sport brake can be ordered as a separate optional equipment (OE 2NH) for 530i and the 540i including xDrive versions.

The M Sport brake is included as standard equipment of BMW M550i xDrive vehicle.

Overview of the variants

The following table provides an overview of the various optional equipment levels and engine versions with which the sport brake is offered.

Parking brake

The electric parking brake is implemented by means of a combined brake caliper on the rear axle, as on the G12. The electric parking brake functions are integrated into the Dynamic Stability Control DSC.

The electric parking brake has automatic roller detection for measuring the brake forces on a brake test stand.

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