Discovery 2. Manual — part 631
BRAKES
DESCRIPTION AND OPERATION
70-15
Front brakes
1 Caliper body
2 Bleed screw
3 Bleed screw cap
4 Piston seal
5 Piston
6 Piston dust cover
7 Brake pad
8 Caliper carrier
9 Brake disc
10 Mudshield
11 Guide pin bolt
12 Guide pin
13 Guide pin dust cover
The front brakes each comprise of a hub mounted, twin piston caliper assembly and a ventilated disc. The inboard
side of the disc is protected by a mudshield.
When hydraulic pressure is supplied to the caliper, the pistons extend and force the inner pad against the disc. The
caliper body reacts and slides on the guide pins to bring the outer pad into contact with the disc.
BRAKES
70-16
DESCRIPTION AND OPERATION
Rear brakes
1 Mudshield
2 Brake disc
3 Caliper carrier
4 Brake pad
5 Piston dust cover
6 Piston
7 Piston seal
8 Caliper body
9 Bleed screw
10 Bleed screw cap
11 Guide pin dust cover
12 Guide pin bolt
13 Guide pin
The rear brakes each comprise of a hub mounted, single piston caliper assembly and a solid disc. The inboard side
of the disc is protected by a mudshield.
When hydraulic pressure is supplied to the caliper, the piston extends and forces the inner pad against the disc. The
caliper body reacts and slides on the guide pins to bring the outer pad into contact with the disc.
BRAKES
DESCRIPTION AND OPERATION
70-17
SLABS ECU
The SLABS ECU is attached to a bracket behind the front passenger glovebox. Brake related inputs are processed
by the SLABS ECU, which then outputs control signals to the ABS modulator. Five electrical connectors interface the
SLABS ECU with the vehicle wiring.
SLABS ECU connector pin details
Connector/Pin No.
Description
Input/Output
C0504
1
Battery supply
Input
2
Ignition supply
Input
3
Road speed
Output
4
Rough road (V8 models only)
Output
5
K line (diagnostics)
Input/Output
7
Reverse gear
Input
8
Return pump monitor
Input
9
Brake warning lamp
Output
10
Engine data (throttle position, torque, engine type, gearbox type)
Input
11
Transfer box range
Input
12
Earth
-
13
ETC warning lamp
Output
14
HDC switch
Input
15
Neutral selected (automatic gearbox only)
Input
16
HDC fault warning lamp
Output
17
HDC information warning lamp
Output
18
ABS warning lamp
Output
C0505
1
Front left wheel speed
Input
2
Front left wheel speed
Input
3
Rear right wheel speed
Input
4
Front right wheel speed
Input
5
Front right wheel speed
Input
6
Rear right wheel speed
Input
7
Rear left wheel speed
Input
8
Rear left wheel speed
Input
C0506
1
Front left outlet solenoid valve
Output
2
Front left inlet solenoid valve
Output
3
Earth
-
4
Front right outlet solenoid valve
Output
5
Front right inlet solenoid valve
Output
BRAKES
70-18
DESCRIPTION AND OPERATION
The SLABS ECU continually calculates vehicle speed using the wheel speed inputs from all four ABS sensors. The
calculated vehicle speed is then used as a reference against which individual wheel speeds are monitored for
unacceptable acceleration or deceleration. The ABS sensor inputs are also used by the SLABS ECU to detect vehicle
deceleration rate, vehicle cornering rate and rough terrain.
The engaged forward gear and (on manual gearbox models) the clutch status are computed from the engine data
input, the engine speed input and vehicle speed. Reverse gear status is provided by an input from the reverse lamp
switch (manual gearbox models) or the BCU (automatic gearbox models). On automatic models, the BCU also
provides the neutral selected input.
In addition to controlling the brake related functions, the SLABS ECU:
l
Controls the operation of the self levelling suspension (SLS) system (where fitted).
REAR SUSPENSION, DESCRIPTION AND OPERATION, Description.
l
On V8 models, outputs a rough road signal to the ECM when traversing rough terrain.
l
Outputs a vehicle speed signal.
The vehicle speed signal is output to the following systems (where fitted):
l
FRONT SUSPENSION, DESCRIPTION AND OPERATION, Description - ACE.
l
AIR CONDITIONING, DESCRIPTION AND OPERATION, Description.
l
ENGINE MANAGEMENT SYSTEM - Td5, DESCRIPTION AND OPERATION, Description.
ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
l
ENGINE MANAGEMENT SYSTEM - Td5, DESCRIPTION AND OPERATION, Description.
ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
l
IN CAR ENTERTAINMENT, DESCRIPTION AND OPERATION, Description.
l
Instrument pack.
INSTRUMENTS, DESCRIPTION AND OPERATION, Description.
ABS sensors
The ABS sensors supply the SLABS ECU with a sinusoidal speed signal from each wheel. An inductive sensor,
installed in the hub bearing of each wheel, senses off a 60 tooth exciter ring integrated into the inner race of the hub
bearing. Each ABS sensor has a fly-lead connecting it to the vehicle wiring.
6
Shuttle valve switches
Input
7
Rear left outlet solenoid valve
Output
8
Rear left inlet solenoid valve
Output
9
Centre differential lock switch
Input
10
Rear right outlet solenoid valve
Output
11
Rear right inlet solenoid valve
Output
12
Brake lamp relay
Output
15
Return pump relay
Output
C0655
7
Audible warning
Output
10
Engine speed
Input
Connector and pins not listed are either not used or used by the self levelling suspension system.
REAR SUSPENSION, DESCRIPTION AND OPERATION, Description.
Connector/Pin No.
Description
Input/Output
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