Dongfeng DFA1063DJ10 (14)-301/303. Instruction - page 23
Brake System
BR-2
Trouble Analysis of Wheel Brake
The trouble of brake system including insufficient braking effectiveness, brake being seized, or only one
brake shoe expanded, and having abnormal sounding. The worn-out brake shoe lining and the overlarge clearance
between the lining and brake drum cause the insufficient braking effectiveness. If you cannot find any causes in
the whole brake system, you should consider the brake's condition.
When the brake is seized, it is necessary to check and make sure whether one brake is seized or all the brakes
are seized. If only one brake is seized, it may this brake down; if all the brakes are seized, the problem may be in
the control mechanism.
In case of only one brake shoe expands the condition of tires and brake unit should be considered.
The abnormal sounding of brake is caused by the worn out brake shoe lining.
Abnormal sound
Unsteady brake
Trouble
Cause
Repair
Abnormal sound when press down
the brake pedal
The rivet or bolt protrude due to the
wear of the brake lining
The brake lining surface is harden
The brake lining surface deteriorated
Bad contact of brake shoe and brake
lining
Uneven wear of brake drum inner
surface or incorrect installation
Brake shoe supporting pin loosed
The wheel hub bearing worn out
The brake drum deformed
Replace brake lining
Replace brake lining
Replace brake lining
Rivet up the rivet or screw up the
bolt
Adjust a screw up brake drum
Adjust the clearance and tighten
the lock nut
Replace the wheel hub bearing
Adjust or replace the brake drum
Trouble
Cause
Repair
Unsteady brake
The pressure in the tires are uneven
or the dimension of tires are not the
same
Improper installation of the brake
shoe or return spring damaged
Incorrect joint of brake lining
Incorrect adjustment of left or right
brake
The brake lining deteriorate
The brake lining have oil
The brake bottom plate is damaged
The U bolt of the spring is loosen
See regulations
Tighten the lock nut and replace
the return spring
Adjust the joint of brake lining
Adjust
Replace brake lining
Clean with petrol, eliminate the oil
leakage of wheel hub
Replace brake bottom plate
Screw up U bolt
Brake System
BR-3
Insufficient brake
All the wheel is seized
Trouble
Cause
Repair
Insufficient brake under any
conditions
Normal air pressure
Brake valve travel is too short
Cam shaft doesn't run (bush lacks
lubricant)
Improper push rod travel of the brake
air chamber
Bad contact of relay valve
Brake shoe lining is overheat or deteri-
orate
Incorrect engaging of brake shoe lining
There is lubricant on brake shoe lining
or brake drum
Check and replace the brake valve if
necessary
Check and replace cam shaft if nec-
essary
Adjust the travel
Disassemble and repair
Replace friction lining
Correct the engaging position
Clean with proper cleanser or
replace the friction lining
Abnormal air pressure
Air pipes leak air
Air compressor doesn't work
Improper adjustment of the unloader
valve or it failed because of impurities
Brake valve leaks air
Repair
Disassemble and repair the air com-
pressor
Adjust or clean
Disassemble and repair the brake
valve
Trouble
Cause
Repair
Wheel seized
Air in brake air chamber
Improper lubricant of cam shaft or adjust-
ing arm return incorrect
Return spring of brake shoe or air cham-
ber is broken or fatigue
Spring brake is in use
Vent of relay valve or quick-release valve
blocked
Primary or secondary piston of brake
valve return failed
Check and correct the exhaust valve of
relay valve and quick-release valve
Correct
Replace
Release the spring brake and eliminate
the question
Disassemble and clean troubled parts
Disassemble and clean brake valve,
replace troubled parts if necessary
Brake System
BR-4
Structure
Front wheel brake
1.Rear dust cap
2.Rubber plug
3.Axis pin
4.Left bracket--front brake chamber
5.Front brake chamber
6.Supporting washer--front brake shoe
7.Front brake cam, left
8.Bush--front bracket
9.O-sealing ring
10.Adjusting spacer
11.Front adjusting arm assy
12.Adjusting spacer
13.Adjusting spacer
14.Front brake bottom plate
15.Shoe plate shaft--front brake
16.Bush--front brake shoe plate shaft
17.Screw--fix shoe plate
18.Spring--axis pin
19.Rivet
20.Brake friction wafer
21.Brake shoe
22.Return spring
Brake System
BR-5
Rear wheel brake
1.Front dust boot
2.Rubber plug
3.Axis pin
4.Front brake air chamber bracket (left)
5.Front left brake chamber assy
6.Spring air chamber bracket spacer
(thickness=0.05)
7.Front left brake cam
8.Bush--rear bracket
9.O--sealing ring
10.Adjusting washer
11.Front adjusting arm assy
12.Adjusting washer
13.Adjusting washer
14.Bush--front bracket
15.Rear brake bottom plate
16.Supporting washer--front brake shoe
17.Nut
18.Sprung axis pin
19.Rivet
20.Brake friction plate
21.Brake shoe
22.Return spring
23.Screw--fix shoe plate shaft
24.Bush--front brake shoe plate shaft
25.Brake shoe plate--front brake