MECHANICAL ELEMENT CONTROLS
Handbrake control
37
98992-1R2
Ensure :
- the cables slide correctly,
- the handbrake levers (B) are in the correct
position against the brake shoes.
Progressively tighten the cables at the central
adjuster so that levers (B) start to move between
the 1st and 2nd notch of the control lever travel
and remain applied from the 2nd notch.
Tighten the lock nuts.
Fit the drums.
With the vehicle on its wheels, adjust the brake
linings by pressing the brake pedal firmly and
progressively for a number of times while
listening for the automatic compensation system
clicking.
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93856-1S
MECHANICAL ELEMENT CONTROLS
External gear control
37
SPECIAL TOOLING REQUIRED
B.Vi. 1133 Shim for locking the gearbox input lever in 1st
Remove the collector.
Engage 1st gear.
TIGHTENING TORQUES (in daN.m)
ADJUSTMENT
Linkage mounting clip bolt on clevice 2
Slacken bolt (V).
Fit shim B.Vi. 1133 to take up any play.
92450-2R
At the same time pull the end of the shim
downwards and pivot it through approximately
45° until it touches the lug on the housing.
92450-3S
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEMS
BOSCH ABS
38
This vehicle is fitted with BOSCH ABS 5.3 of the four channel additional type; the conventional braking
equipment and the ABS equipment are separate.
SPECIAL NOTES
The system comprises four speed sensors. Each hydraulic braking channel is associated with a sensor at each
wheel. The front wheels are therefore regulated separately. The rear wheels however are regulated at the
same time and in the same way according to the select low principle (the first wheel which tends to lock
causes immediate regulation on the complete axle assembly). The compensator fulfils its normal function.
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ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEMS
BOSCH ABS
38
HYDRAULIC BRAKING TEST
This section describes the test to be carried out using the XR25, to check the mounting of the ABS system in
the vehicle and, in particular, the hydraulic circuit.
NOTE: for this test, two persons are required and the vehicle must be on a two post lift, if possible.
Principle of the test
Put the vehicle on the lift with the wheel to be tested raised. One of the operators must be in the passenger
compartment in the driver’s position with the XR25. Switch the ignition on, vehicle in neutral, in fault finding
mode and press the brake pedal. The second operator must apply a torque to the wheel to try and rotate it.
The operator generates an appropriate command on the XR25 which carries out the following cycle ten
times: alternate decrease then increase in pressure at the wheel to be checked. These actions in the ABS will
be noted at the wheel as ten alternate locking and releasing operations. The jerky movement of the wheel,
noted qualitatively by the operator, signify that the hydraulic circuit for this wheel is correctly connected.
The programme for the XR25 for this sequence is as follows:
- Cycle on the wheel to be tested:
- a drop in pressure for 200 ms where the pump starts at the same time,
- an increase in pressure for 300 ms where the pump starts at the same time (ten cycles are carried out
for the wheel in question).
- The pressure increases to master cylinder pressure for all four wheels.
- The hydraulic pump motor stops.
- The operator releases the brake pedal.
The hydraulic test for the wheel in question is complete - begin the test for the three other wheels.
BLEEDING PROCEDURE
NOTE :
the hydraulic assembly is pre-filled.
This bleeding procedure must be used when one of the following components has been removed:
- the hydraulic assembly,
- the master cylinder,
- the pipework (between the hydraulic assembly and the master cylinder).
1)Bleed the braking system conventionally using the pedal.
NOTE : if, after a road test with ABS regulation, the pedal travel is not correct, bleed the hydraulic assembly.
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