2122.6-0000010 OM
216
Table 6.7.1 continued
Failure, external manifestation,
cause
Troubleshooting
Sticking of brakes
There is no pedal free travel (no
clearance between the piston and
the main cylinder piston follower).
Adjust pedal free travel
Sticking of main brake cylinder pis-
tons (fail to go back in their initial
position) due to piston cup and O-
ring expansion, resulting in closure
of compensating openings be-
cause of using incorrect hydraulic
brake fluid or because of ingress of
mineral oil, petroleum, kerosene,
diesel fuel into the hydraulic brake
system
Rinse the hydraulic drive system with hydraulic
brake fluid. Replace damaged cups and O-rings in
the main and operating cylinders. Replace hydrau-
lic brake fluid. Then bleed the hydraulic system
with brake fluid
Sticking of operating brake cylinder
pistons due to piston cups expan-
sion
Rinse carefully the hydraulic drive system with hy-
draulic brake fluid. Replace damaged cups and O-
ring in operating cylinders. Replace hydraulic brake
fluid. Then bleed the hydraulic system with brake
fluid
Clogging of compensating open-
ing in the main cylinder
Unclog the compensating port of the main cylinder
and bleed the hydraulic system with brake fluid
Weakening or breakage of pres-
sure discs pullback springs
Replace pullback springs of pressure discs
Presence of wear and tear signs
on working surfaces of pressure
discs
Clean working surfaces of pressure discs
Presence of wear and tear signs
on dimple surfaces of pressure
discs
Replace pressure discs
Uneven braking of left and right wheels
Faulty adjustment of service
brakes
Make adjustments
Malfunctioning of leveling valves in
main brake cylinders (with mount-
ed cylinders “CARLISLE”)
Disconnect the tube connecting two main brake
cylinders, turn back fittings and dismount leveling
valves. Replace worn-out parts. Then bleed the
hydraulic system with brake fluid
Malfunctioning of leveling valve in
main brake cylinders (with mount-
ed cylinders “FENOX”)
Replace the leveling valve. Bleed the hydraulic
system with brake fluid
Clogging or crumpling of brake
control pipelines in one of the cir-
cuits or pipeline of leveling valves
in main brake cylinders “CAR-
LISLE”
Clean or replace pipelines. Bleed the hydraulic
system with brake fluid
Frictional brake discs wear and
tear
Replace frictional discs
Inefficiency of parking brake operability
Improper adjustment of the parking
brake
Adjust the parking brake
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