MT86 Operation and Maintenance Manual
121
Relay valve is out of work
When air exists in the relay valve inlet (1
opening) and the brake valve relay valve (4)
but (2), replace the relay valve.
Brake air chamber is damaged
If there is no problem with the above valves,
depress the brake pedal. If the brake air
chamber 11 opening is smooth but the brake
air chamber push rod cannot be pushed out,
replace the brake air chamber.
Horn does not work
and differential lock
solenoid valve inlet
has no air, causing
stalling failure
System pressure is insuffici
ent
Start the truck without stalling until the
barometer indicates 0.85 MPa, make it stall
for 10 minutes. If the pressure drops by more
than 0.15MPa, the pipeline may leak or the air
chamber may be damaged. Check the pipeline
and the air chamber. Pressure in 21 opening
and 22 opening can not be increased, so 23
opening and 24 opening can not inflate. If the
pressure reaches up to 0.85 M,Pa (due to
accuracy of barometer), the air dryer and the
four-circuit protection valve may have failed.
Replace them.
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