10 - 2
FAULT
G Pulling to one side when pedals
locked together (cont'd).
H Poor braking (not pulling to one
side).
J One or both brakes not releasing.
POSSIBLE CAUSE
2 Braking system inoperative on
one side.
3 Friction plates worn beyond limits
or distorted on one side.
4 Badly adjusted push rods.
5 Annular piston fault (see item J6).
1 Friction plates worn beyond limits
or distorted on one side.
2 Master cylinder fault.
3 Annular piston fault (see item J6).
4 Incorrect/low axle oil.
1 Brake pedal spring fault.
2 Master cylinder fault (plunger
stuck in bore).
3 Blocked hole in master cylinder
reservoir cap.
4 Brake pedal free travel incorrect.
5 Fluid contamination/seal damage.
6 Annular brake piston(s) binding in
axle.
7 Kinked or crushed brake pipes.
8 Friction/counter plates not free on
splines and/or dowels.
ACTION
2 Unlatch pedals to test circuits
individually.
3 Renew friction/counter plates -
BOTH sides.
4 Adjust push rod (1mm minimum).
5 See item J6.
1 Renew friction/counter plates
- BOTH sides.
2 Check master cylinder in single and
coupled pedal modes to identify fault
area, service as required.
3 See item J6.
4 Fill axle with correct type of oil.
1 Fit a new spring.
2 Service as required.
3 Fit a new reservoir cap.
4 Adjust pedal free travel.
5 Flush system and renew hydraulic
seals.
6.1 Check that correct brake fluid has
been used (incorrect fluid could swell
the annular brake piston seals).
6.2 Check if annular brake piston seals
in good condition.
6.3 Check that annular brake piston
rotates freely in its housing with no
seals fitted.
6.4 Check that the annular brake piston
seal retracts the piston
approximately 0.5mm (0.020 in).
7 Check and renew pipes as required.
8 Check friction/counter plates for free
movement, replace if required -
BOTH sides.
Section G Brakes
9803/7130
Section G
10 - 2
Issue 1
Fault Finding
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