Location of units and parts (Discovery 3)

Item name	Spare part catalog number	Description
1		Clutch Pedal Position Sensor (only for models with manual transmission)
2		Parking brake warning lights (excluding vehicles intended for the North American market)
3		Parking brake warning lights (for vehicles intended for the North American market)
4		Brake drum
5		Parking brake control unit
6		Parking brake cable
7		Emergency release rope
8		Parking brake switch.

General information

The parking brake is a system with an electric drive of drum brake mechanisms built into the rear brake discs. The parking brake system includes:

• Parking brake switch.
• Left and right drum brakes.
• Left and right drum brake cables.
• Parking brake emergency release cable.
• Clutch Pedal Position Sensor (only for models with manual transmission).
• Two parking brake indicators.
• Parking brake control unit.

(The original article can be found here lrman.ru)

The parking brake control unit regulates the tension of the brake cables, thereby engaging and disengaging the drum brakes. The parking brake control unit receives commands from the parking brake switch.