DAF 95XF. Manual — part 109
6
Brake system
DIAGNOSIS
1-3
FAULT: POOR BRAKING DECELERATION
Possible cause
Remedy
Overloading due to too heavy load
Check vehicle load conditions
System pressure too low
Check pressure regulator setting
Air leakage in braking system
Check braking system for leaks
Insufficient braking power/wrong
(semi-)trailer braking system conditions
Check (semi-)trailer
Heavy brake pipe bending
Check/replace brake pipes
Excessive brake cylinder stroke
Check automatic slack adjuster
Frozen braking system
Check braking system
Excess of pollution on brake components
Check brake components for contamination
Contaminated brake cylinders
Check brake cylinders for contamination
Incorrect brake cylinder diameter
Check brake cylinders
Brake linings contaminated by grease or oil
Check for excess of grease or oil on sealing
rings and/or cam rollers
Poorly machined brake linings, brake lining has
poor contact with brake drum
Check brake lining bearing pattern
Damaged brake lining surface
Check brake linings
Poor quality of brake linings
Check brake linings
Hardened brake linings
Check brake linings
Damaged brake shoes
Check brake linings
Jammed brake shoe bearings
Check brake shoes
Loose S-camshaft bearing
Check S-camshaft bearing
Worn roller-cam/roller-cam bearing
Check roller-cam/roller-cam bearing
Incorrect operation/setting of load-sensing
adjustment valve
Check operation/setting of load-sensing
adjustment valve
Incorrect vehicle combination setting
Check vehicle combination setting
Incorrect ABS operation
Check ABS operation
1
ǹ 0006
6
DIAGNOSIS
Brake system
1-4
FAULT: VIBRATIONS DURING BRAKING
Possible cause
Remedy
Wrong tightening method when fitting the wheels
Tighten the wheels according to the appropriate
procedure
Non-standard wheel fitting
Use only standard wheels
Overloading due to too heavy load
Check vehicle load conditions
Incorrect brake pressure setting front axle/rear
axle
Check front axle/rear axle setting
Poor quality of brake linings
Check brake linings
Poor machining of brake linings Use of a blunt
chisel during machining
Check brake linings
Loose brake lining on brake shoe
Check brake lining/lining rivets
Loose brake shoes
Check brake shoe attachment
Brake drums not or insufficiently reconditioned
Check brake drums
Different or lesser quality brake drums
Check brake drums
Cracked brake drums
Check the length and depth on cracks of brake
drums
Deformed/oval brake drums
Check brake drums
Hardened parts on brake drum due to
overheating
Check/replace brake drums
Play in cab suspension
Check cab suspension
Incorrect vehicle combination setting
Check vehicle combination setting
1
ǹ 0006
6
Brake system
DIAGNOSIS
1-5
FAULT: BRAKE LOCKING
Possible cause
Remedy
Incorrect setting of load-sensing adjustment
valve
Check setting of load-sensing adjustment valve
Overheating of brake linings on the non-locking
axle
Check brake linings on non-locking axle
Poor machining or no machining of brake linings
Check brake linings
Use of a blunt chisel during machining of brake
linings
Check brake linings
Different or lesser quality brake drums
Check brake drums
Hardened parts on brake drum due to
overheating
Check/replace brake drums
Loose S-camshaft bearing
Check S-camshaft bearing
Worn roller-cam/roller-cam bearing
Check roller-cam/roller-cam bearing
Wrong system pressure due to incorrect setting
of pressure regulator
Check pressure regulator setting
Defective (semi-)trailer braking system
Check (semi-)trailer braking system
Incorrect vehicle combination setting
Check vehicle combination setting
Incorrect ABS operation
Check ABS operation
Insufficient tyre tread
Check tyre tread
1
ǹ 0006
6
DIAGNOSIS
Brake system
1-6
FAULT: EXCESSIVE WEAR OF BRAKE LININGS
Possible cause
Remedy
Overloading due to too heavy load
Check vehicle load conditions
Incorrect setting of service-brake valve stop bolt
(residual pressure)
Check service-brake valve setting
Incorrect setting of load-sensing adjustment
valve
Check setting of load-sensing adjustment valve
Incorrect vehicle combination setting on front
axle/rear axle
Check vehicle combination setting on front
axle/rear axle
Defective (semi-)trailer braking system
Check (semi-)trailer braking system
Heavily polluted brakes, jamming pivoting points
on brake shoes
Check free movement of brake shoes, clean
brakes
Different /poor quality of brake linings
Check brake linings
Too loose or broken return spring
Check return spring
Defective brake slack adjuster
Check automatic slack adjuster
Cracked brake drums
Check the length and depth on cracks of brake
drums
Insufficient air pressure on brake cylinders when
driving, brake dragging
Check air pressure in brake cylinders when the
parking brake valve is in driving position
Dragging brakes, since parking brake is not
released
Check parking brake release
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
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