Land Rover Discovery: Hydraulic Brake Actuation / Description and Operation
COMPONENT LOCATION
NOTE:
Right Hand Drive (RHD) illustration shown, Left Hand Drive (LHD) illustration similar.
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- Brake pedal
- Hydraulic pipes
- Integrated Hydraulic Control Unit (HCU) and Anti-lock Brake System (ABS) module
- Brake master cylinder and fluid reservoir.
OVERVIEW
The hydraulic brake system is a diagonally split, dual circuit system and consists of the brake pedal, brake master cylinder, fluid reservoir, Hydraulic Control Unit (HCU) and the brake pipes and hoses.
The preformed rigid brake pipes distribute pressure from the master cylinder to flexible hoses connected to the front and rear calipers, via the integrated HCU and Anti-lock Brake System (ABS) control module.
DESCRIPTION
BRAKE PEDAL
- Brake pedal switch operating plate
- Brake pedal switch
The brake pedal is mounted in a bracket attached to the rear side of the engine bulkhead. The brake pedal is connected to the brake booster push rod with a clevis pin.
The brake pedal switch is mounted on the brake pedal bracket and operated by a plate attached to the brake pedal. The brake pedal switch is a combined switch, contains a stop lamp switch and a brake test switch in one housing. Both switches are connected hardwired to the Central Junction Box (CJB), to give independent signals of brake pedal operation.
Hydraulic Brake Actuation Brake Pedal and Bracket (G2164230) / Removal and
InstallationBrake Master Cylinder and Fluid Reservoir
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Brake Master Cylinder and Fluid Reservoir
Brake fluid reservoir cap
Brake fluid level switch
Brake fluid reservoir
Secondary circuit inlet port
Primary circuit inlet port
Brake master cylinder
Secondary circuit outlet port
Primary
Hydraulic Control Unit (HCU)
Anti-lock Brake System (ABS) control module
Secondary circuit port
Left front caliper port
Right front caliper port
Primary circuit port
Left rear caliper port
Right rear caliper port
Hydra
Parking Brake and Actuation Electronic Parking Brake Release When the
Vehicle Has no Electrical Power (G1785116) / General Procedures
CHECK
WARNING:
Chock the wheels and make sure that all personnel are clear of the
vehicle before carrying out the following procedure
NOTES:
To be carried out in the event that the vehicle has no el
SEE MORE:
Wade sensing
WADE SENSING CONTROLS
Wade sensing should not be used
during off-road driving as rapid
increases in water depth cannot
be detected in time to deliver a
warning message to the driver.
When entering water from a steep
gradient, the water level may rise
rapidly.
The Wade sensing system cannot
Cylinder Head Gasket (G1875895) / Installation
INSTALLATION
Check cylinder head face for distortion, across the center and from
corner to corner.
CAUTION:
Make sure that the dowels and dowel holes are clean and
free from debris and foreign material.
NOTE:
The cylinder head gasket must be installed over the cylinder
head to cylinder block dow
