Land Rover Anti Lock Control Traction Control Rover Manual

							BRAKE PIPES AND HOSES
The brake pipes and hoses connect the master cylinder
to the wheel brakes via the hydraulic control unit. The
pipes are arranged to provide a front and rear split
braking system. The brakes on the front axle are
operated by the primary system; the brakes on the rear
axle are operated by the secondary system.
Hydraulic Brake ActuationLesson 2 – Chassis
127Technical Training (G421076) 
						

							On completing this lesson, you will be able to
•Identify the front suspension components
•Explain which suspension components are serviceable
•Use GTR to locate which service tools are required for the front suspension upper control arm ball joint
•Obtain from GTR the specific instructions regarding fitment of the front suspension upper ball joint
•Use GTR to locate front geometry settings
•Answer the questions raised in this worksheet
•Identify rear suspension system components
•Explain which rear suspension components are serviceable
•Be able to locate which service tools exist from the GTR database
•Describe the setting procedure of the rear toe link arm
•Explain the correct procedure for removing the tyre from a rim with tyre pressure monitoring
•Locate the components associated with tyre pressure monitoring
•Describe at a high level the operation of the tyre pressure monitoring system
•Explain the warning light and message functionality (if applicable)
•State the T4 diagnostic servicing implications for checking tyre pressure wheel sensor battery life and manual
programming
•Locate all major air suspension components
•Use T4 diagnostic system to remove vehicle out of transport mode
•Set up the air suspension system for operation with the remote key fob (plip)
•Use GTR to locate the service tools required to conduct a suspension set up routine in conjunction with the T4
diagnostic unit
•Describe the functionality of the transfer box and explain system operation and component location.
•Understand the reasons and advantages for its application i.e. Special programs,Grass/Gravel/ Snow/Sand and
rock crawl.
•Understand the operation of all terrain functions to include shift on the move selection and torque bias strategy.
•Describe interaction of other electronic vehicle systems: i.e. EMS,Automatic transmission,Brake system
(ABS/DSC/HDC functions) Rear differential (electronic).
•To locate electronic control and mechanical components.
•Carry out any servicing requirements.
•Describe any special towing procedures.
•Understand Terrain Response diagnostics using T4 (stored faults in control module).
ObjectivesLesson 2 – Chassis
9Technical Training (G420473) 
						

							•Identify rear drive axle and differential components
•Explain which rear drive axle and differential components are serviceable
•Be able to locate relevant service tools from the GTR database
•Identify the parking brake components and their locations on Discovery 3
•Understand the operation of the components
•Know the serviceability of the components
•Know the service procedures of the system
•Identify the hydraulic brake components and their locations on Discovery 3
•Know the serviceability of the components
•Identify the power brake actuation components and their locations on Discovery 3
•Understand the operation of the components
•Identify the ABS components and their locations on Discovery 3
•Understand the operation of the components
•Know the serviceability of the components
(G420473) Technical Training10
Lesson 2 – ChassisObjectives 
						

							COMPONENT LOCATIONS
Clutch pedal position sensor (manual
transmission models only)
1
Parking brake indicators (all except NAS)2
Parking brake indicators (NAS only)3
Drum brake4
Parking brake module5
Parking brake cable6
Emergency release cable7
Parking brake switch8
(G421073) Technical Training104
Lesson 2 – ChassisParking Brake 
						

							GENERAL
The parking brake is an electrically actuated system that
operates drum brakes integrated into the rear brake discs.
The parking brake system consists of:
•A parking brake switch.
•Left and right drum brakes.
•Left and right brake cables.
•An emergency release cable.
•A clutch pedal position sensor (manual transmission
models only).
•Two parking brake indicators.
•A parking brake module.
The parking brake is operated by the parking brake
module, which adjusts the tension of the brake cables
to apply and release the drum brakes. Operation of the
parking brake module is initiated by the parking brake
switch.
PARKING BRAKE SWITCH
Cover1
Parking brake switch2
Securing screw3
Electrical connector4
The parking brake switch is used by the driver to apply
and release the parking brake, and is installed in the
center console adjacent to the gear lever.
Slots on the sides of the parking brake switch engage
with the top panel of the center console, and a screw
secures the parking brake switch in position. An
electrical connector on the back of the switch provides
the interface with the vehicle wiring. A brake symbol
on the switch illuminates when the exterior lamps are
selected on.
There are three states for the parking brake switch:
•Apply request, when the handle of the parking brake
switch is pulled up.
•Release request, when the handle of the parking
brake switch is pushed down.
•Idle, when the handle of the parking brake switch is
in the central or rest position.
Microswitches, incorporated into the parking brake
switch, are activated by the handle of the parking brake
switch. To determine the operating state of the parking
brake switch, the parking brake module scans the circuits
containing the microswitches.
Parking BrakeLesson 2 – Chassis
105Technical Training (G421073) 
						

							DRUM BRAKES
NOTE: RH brake shown, LH brake similar
Brake shoe1
Shoe locating pin and clip2
Adjuster spring3
Toothed wheel adjuster4
Backplate5
Return spring6
Cross strut7
Wedge adjuster screw8
Dust shield9
Rear brake disc10
Adjuster access plug11
(G421073) Technical Training106
Lesson 2 – ChassisParking Brake 
						

							Each drum brake consists of a pair of brake shoes
installed on a backplate attached to the rear hub carrier.
The brake shoes operate on the drum integrated into the
rear brake disc. The orientation of the brake shoes differ
by 180° between the LH and RH brakes.
When the parking brake module tensions the brake
cables, the movement is transmitted to an operating
lever on one of the brake shoes. The operating lever
pivots against a cross strut, which forces the brake shoes
apart and into contact with the drum in the rear brake
disc. Brake shoe to drum clearance is set with two
manual adjusters, which are accessed through a hole in
the brake disc. One of the adjusters is a conventional
toothed wheel adjuster. The second adjuster is a wedge
adjuster operated by an Allen screw.
After replacement of the brake shoes or brake discs, a
bedding in procedure must be performed to ensure the
drum brakes operate satisfactorily.
Prior to removing a brake disc from a vehicle, power
should be disconnected from the parking brake module.
Operation of the parking brake switch while a brake
disc is removed can cause the actuating mechanism in
the parking brake module to seize.
Parking BrakeLesson 2 – Chassis
107Technical Training (G421073) 
						

							BRAKE CABLES
Gearbox1
Parking brake module housing2
Cable nut3
Sealing collar4
Threaded connector5
Spline shaft6
Force sensor7
Shoe8
Locking cover9
Sealing collar10
Cable nut11
(G421073) Technical Training108
Lesson 2 – ChassisParking Brake 
						

							The brake cables consist of Bowden cables installed
between the parking brake module and the drum brakes.
Nuts, on the ends of the outer cables, secure the brake
cables to the parking brake module and the backplate
of the related drum brake. In each drum brake, the inner
cable is located in the guide spring and connected to the
brake shoe operating lever by a nipple on the end of the
cable. In the parking brake module, the two inner cables
are joined together via the force sensor and the spline
shaft.
The inner cable of the RH brake cable is connected to
a nipple on the force sensor by a shoe on the end of the
cable; a locking cover keeps the shoe engaged with the
nipple.
The inner cable of the LH brake cable is connected to
the spline shaft by a threaded connector (LH thread); a
squared flange at the end of the threaded connector
locates in the housing of the parking brake module, to
prevent the threaded connector from turning with the
spline shaft.
When the spline shaft turns, the threaded connector of
the LH brake cable is screwed into or out of the spline
shaft, which changes the effective length of the inner
cables and operates the drum brakes. The ability of the
spline shaft to move axially in the gearbox equalizes
the load applied by the inner cables to the two drum
brakes.
Prior to disconnecting a brake cable, power should be
disconnected from the parking brake module. Operation
of the parking brake switch while a brake cable is
disconnected can cause the actuating mechanism in the
parking brake module to seize. In addition, the parking
brake may not switch off until 20 minutes after key-off.
Automatic re-apply cannot be eliminated until this
period has expired.
Parking BrakeLesson 2 – Chassis
109Technical Training (G421073) 
						

							EMERGENCY RELEASE CABLE
Pull ring1
Quick release fitting2
Parking brake module3
Sealing collar4
Spring5
Inner cable6
Nipple7
Pulley wheel8
The emergency release cable allows the parking brake
to be mechanically released if:
•The parking brake cannot be electrically released
because of a system fault.
(G421073) Technical Training110
Lesson 2 – ChassisParking Brake