Land Rover Discovery: Brake Master Cylinder and Fluid Reservoir
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- 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 circuit outlet port
- Clutch circuit outlet port (manual transmission only)
The brake master cylinder is attached to the front of the brake booster, on the driver's side of the engine compartment. The brake master cylinder is a tandem design that supplies pressure to two independent (primary and secondary) hydraulic circuits. Each circuit is connected between the calipers of diagonally opposing front and rear wheels to provide a fail safe brake system.
A reservoir is mounted on top of the master cylinder and retains sufficient volume of hydraulic fluid to allow for normal system use, and to compensate for the replenishment of the system as the brake linings wear. The reservoir is internally divided to provide an independent supply of fluid to each brake circuit, and prevents a single fluid leak from disabling both primary and secondary brake circuits. If a failure occurs in one brake hydraulic circuit the remaining circuit will still operate effectively, although brake pedal travel and vehicle braking distances will increase.
On vehicles with manual transmission, the brake fluid reservoir also supplies hydraulic fluid for operation of the clutch assembly
Brake Fluid Level Switch
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- Contact carrier
- Contact
- Float
The reservoir incorporates a brake fluid level switch that is hardwired to the Central Junction Box (CJB). When the reservoir fluid falls to a predetermined low level, the switch contacts close and provide a signal feed back to the CJB. The CJB then sends a message on the High Speed (HS) Controller Area Network (CAN) Powertrain bus to the Instrument Cluster (IC), which illuminates the brake fluid warning indicator lamp.
READ NEXT:
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
Parking Brake and Actuation Parking Brake Release Actuator (G1785118) / Removal and
Installation
PART(S)
REMOVAL
NOTE:
Removal steps in this procedure may contain installation details.
Connect the diagnostic tool and set the electric park brake (EPB) to
the maintenance position.
NOTE:
This step
SEE MORE:
Wheel changing safety
Before raising the vehicle or changing a
wheel, make sure that you read and
comply with the following warnings:
Always find a safe place to stop;
off the highway and away from
traffic.
Do not jack the vehicle if it is over
a metal grating or manhole cover.
Make sure the vehicle is on firm,
l
General Information Battery
Support Unit
Connection Procedure
CONNECT
WARNINGS:
Do not smoke or carry lighted tobacco or open flame of any type
when working on or near the vehicles battery. Highly flammable
vapors may be present and ignite. Failure to follow these
instructions may result in personal injury.
Avoid flames, sparks or lighted substances.
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