DAF 95XF. Manual — part 110
6
Brake system
DIAGNOSIS
1-7
FAULT: DAMAGED BRAKE DRUMS
Possible cause
Remedy
Overloading due to too heavy load
Check vehicle load and use conditions
Brake drums of lesser quality
Check quality/make of brake drums
Wrong tightening method when fitting the wheels
Tighten the wheels according to the appropriate
procedure
Heavily contaminated brakes
Clean brakes
Poor quality of brake linings
Replace brake linings
Poorly machined brake linings, brake lining has
poor contact with brake drum
Check brake linings
Loose S-camshaft bearing
Check S-camshaft bearing
Reconditioned brake drums larger than
maximum diameter allowed
Replace brake drums
Incorrect operation of non-increment function of
braking system
Check non-increment function of braking system
1
ǹ 0006
6
DIAGNOSIS
Brake system
1-8
FAULT: DAMAGED BRAKE LININGS
Possible cause
Remedy
Overloading due to too heavy load
Check vehicle load and use conditions
Heavily contaminated brakes
Clean brakes
Poor quality of brake linings
Check quality/make of brake linings
Frozen or rusted brakes released by force
Replace brake linings
Wrong brake lining machining, use of a blunt
chisel during machining
Check/replace brake linings
Too high pressure on rivets when fitting brake
linings on brake shoes
Apply right pressure on rivets when fitting brake
linings on brake shoes
Too low pressure on rivets when fitting brake
linings on brake shoes
Apply right pressure on rivets when fitting brake
linings on brake shoes
Wrong order of placing rivets when fitting brake
lining on brake shoe
Follow the right procedure during brake lining
fitting
Worn and/or damaged brake shoes
Check/replace brake shoes
Damaged lining due to broken return spring
Check return spring
1
ǹ 0006
6
Brake system
DIAGNOSIS
1-9
FAULT: DRAGGING BRAKES
Possible cause
Remedy
Incorrect setting of service-brake valve stop bolt
(residual pressure)
Adjust stop bolt
Leakage of foot valve to circuit 1 and/or 2
Check foot valve for leaks
Insufficient air pressure on brake cylinders when
driving
Check the non-increment relay valve output
pressure
Check four-circuit safety valve for contamination
Check the parking brake valve output pressure
Heavily polluted brakes, jamming brake shoes
Check free movement of brake shoes, clean
brakes
Broken or too loose return spring between the
brake shoes
Check return spring
Wrong type of brake lining
Check type and clearance of brake lining
Movement of S-camshaft
Check S-camshaft motion
Defective brake slack adjuster
Check automatic slack adjuster
Too low output pressure from trailer control
valve to trailer or semi-trailer
Check trailer control valve output pressure
Dirt on foot valve/floor mat too high
Check foot valve free movement
Dirty/clogged breathers of brake valves
Check breathers of brake valves
1
ǹ 0006
6
DIAGNOSIS
Brake system
1-10
1
ǹ 0006
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