Parking Brake System: Description and Operation

Handbrake Lever

Handbrake lever
The handbrake lever on the R56 is located in the centre console between the driver's seat and front passenger's seat. The handbrake serves to secure the stationary vehicle against rolling away.

Brief description of components
The following components are described for the handbrake:
- Handbrake lever
- Parking-brake switch
- Junction box electronics (JBE)
- Additional instrument

Handbrake lever
The handbrake lever is connected via bowden cables to the brake callipers of the rear axle. The parking-brake warning switch is located on the handbrake lever.

Parking-brake warning switch
When the handbrake lever is moved upwards or downwards, the parking-brake warning switch detects this. The parking-brake warning switch switches earth to the entrance of the junction box electronics (JBE) as soon as the handbrake lever is moved upwards.

Junction box electronics (JBE)
The JBE processes the earth signal from the parking-brake warning switch. The JBE sends a message on the K-CAN to the additional instrument. The JBE is located below the glove compartment.

Additional instrument
The additional instrument contains the warning and indicator lamps. As soon as the message 'Parking brake activated' is sent by the JBE, the indicator light of the parking brake starts to light up in the additional instrument. The indicator light of the parking brake goes out as soon as the handbrake lever has been completely moved downwards.












System functions
The following system functions are described for the handbrake lever:
- Engaging
- Disengaging
- Optical display

Engaging
The brake is engaged by pulling the handbrake lever upwards. The handbrake lever is connected via bowden cables to the brake callipers of the rear axle.

Disengaging
The brake is disengaged by moving the handbrake lever downwards. To do so, the unlock button in the handbrake lever must be pressed and held down.

Optical display
As of terminal R, the indicator light for the parking brake can light up. When the handbrake lever is pulled, thus activating the parking brake, this is indicated by a red indicator light in the additional instrument.
No liability can be accepted for printing or other errors. Subject to changes of a technical nature.