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

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