Possible Failures Of Trailer Brake Hydraulic Actuator And Guidelines For Troubleshooting - Belarus 2022.6 Operator's Manual

6.9 Possible failures of trailer brake hydraulic actuator and guidelines for
troubleshooting
List of possible failures of trailer brake hydraulic actuator and guidelines for trouble-
shooting are given in table 6.9.1.
Table 6.9.1
Failure,
external manifestations, cause
Inefficient braking of trailer along with inefficient operation of service brakes
Presence of air in the hydraulic brake
control system
Hydraulic brake fluid shortage in hy-
draulic brake control system tanks
Brake fluid leakage in junctions or
pipelines in the hydraulic drive sys-
tem. Air inflow into the hydraulic brake
control system
Clogging of the opening in main cylin-
der tank fitting, causing depression in
main cylinder, as a result of which air
leaks into the cylinder through seal-
ings
Clogging of pipelines of the hydraulic
drive system due to dent or contami-
nation
Insufficient brake pedal travel or the
pedal strikes against the cab wall
Faulty adjustment of service brake
actuator
Inefficient braking of trailer along with poor operation of hydraulic link linkage.
Loss of pump performance
Low level of oil in HLL tank
Oil leakage in junctions or high-
pressure hose of hydraulic drive sys-
tem
Inefficiency of trailer braking. HLL and service brakes function well
Brake valve is faulty
Trailer brake system is faulty
Oil pressure in hydraulic control line
exceeds 0 MPa with pedals released
Trailer brake system is faulty
Bleed the hydraulic system with brake fluid
Bring brake fluid in the main cylinder reservoirs to
the required level, then bleed the hydraulic system
with brake fluid
Tighten up junctions, replace damaged parts, then
bleed the hydraulic system with brake fluid
Unclog the opening. Then bleed the hydraulic sys-
tem with brake fluid
Replace pipelines. Then bleed the hydraulic system
with brake fluid
Adjust the clearance between the piston and the
main cylinder piston follower
Adjust the service brake actuator
Service brakes function well
Replace the pump
Add oil up to a required level
Tighten the junctions, replace worn out parts
Replace the brake valve
Repair a failure in trailer brake system
Trailer brakes are not released
Replace the brake valve
Repair a failure in the trailer brake system
199
2022.6-0000010 OM
Troubleshooting