Service Information

Volt

Hand brake System Description and Operation

System Component Description

The hand brake system consists of the following:

Electronic Hand Brake (EHB) Control Module Assembly: Transfers hand brake system apply input force to the hand brake cable system.

Electronic Hand Brake Switch: Applied by the driver and activates EHB control module or Electronic Stability Control (ESC) braking system.

Hand brake Cable: Transfers input force received from the electronic hand brake control module, through the hand brake cable equaliser, to the hand brake apply lever.

Hand brake Cable Equalizer: Evenly distributes input force to both the left and right hand brake assemblies.

Hand Brake Apply Lever: Multiplies and transfers input force from the hand brake cable to mechanically apply the rear disc brake callipers

Disc Brake Calliper:: Transfers input force from the hand brake apply levers to the rear disc brake pads

Disc Brake Pads:: Applies mechanical output force from the disc brake callipers to the friction portion of the rear disc brake discs

System Operation

Hand brake apply input force is received by activating the electronic hand brake switch signalling the EHB control module, and transfers an evenly distributed force through the hand brake cables and equaliser to the hand brake apply levers. The hand brake apply levers multiply and transfer the input force to mechanically apply the rear disc brake callipers to prevent the rotation of the rear tyre and wheel assemblies. The electronic hand brake switch signals the EHB module to release applied input force the hand brake cables when activated. The EHB module then removes the applied input force, releasing the hand brake.