Location of units and parts (Discovery 3)

Item name	Spare part catalog number	Description
1	-	Hydraulic control unit mounted on the ABS module (anti-lock braking system)
2	-	Brake light switch
3	-	Right rear wheel speed sensor
4	-	Left rear wheel speed sensor
5	-	Yaw and Lateral Acceleration Sensor
6	-	HDC Relay (controlled descent system) (maintenance-free, built into CJB (central electrical distribution box))
7	-	Steering wheel angle sensor
8	-	Left Front Wheel Speed Sensor
9	-	Right Front Wheel Speed Sensor

Item name	Spare part catalog number	Description
1	-	Brake system warning light (for North American market only)
2	-	ABS warning light (anti-lock braking system)
3	-	Brake system warning light (except for vehicles for the North American market)
4	-	DSC switch (dynamic stability control system)
5	-	HDC switch (controlled descent system)
6	-	HDC Malfunction Indicator Lamp (only for models with low level instrument cluster)
7	-	HDC Status Indicator Light
8	-	DSC indicator light

General information

The anti-lock and anti-slip control system is based on the four-channel Bosch 8.0 system and performs the following braking functions:

• ABS (anti-lock braking system).
• ARM (active roll reduction).
• CBC (cornering braking system).
• DSC.
• EBD (electronic Brakeforce Distribution).
• ETC (electronic traction control system).
• EBA (emergency braking assistance system).
• EDC (engine braking torque control).
• HDC.

The system includes the following components:

• DSC switch.
• HDC switch.
• HDC relay.
• Brake light switch.
• Four wheel speed sensors.
• Yaw rate and lateral acceleration sensor.
• Steering wheel angle sensor.
• Indicator lamps: four on vehicles with high-level instrument cluster and five on vehicles with low-level instrument cluster.
• HCU (hydraulic control unit) with an ABS module attached to it (anti-lock braking system).

See the source on the website [LRman.ru]