DAF CF65, CF75, CF85 Series . Manual — part 876
6
CF65/75/85 series
Drum brake construction
DIAGNOSTICS
2-3
SYMPTOM: POOR BRAKING DECELERATION
Possible cause
Remedy
Overload due to excessive loading
Check vehicle loading condition
System pressure too low
Check pressure regulator setting
Air leaks in the brake system
Check the brake system for leaks
Insufficient braking power/poor condition of
trailer vehicle brake system
Check trailer vehicle
Pinched brake lines
Check/replace brake lines
Brake cylinder stroke too large
Check automatic brake adjuster
Frozen brake system
Check brake system
Brake components affected by road salt
Check brake components for fouling
Fouled brake cylinders
Check brake cylinders for fouling
Incorrect brake cylinder diameter
Check brake cylinders
Brake linings affected by grease or oil
Check seals and/or cam rollers for excess
grease or oil
Incorrect turning of the brake linings, brake
lining is incorrectly positioned against the brake
drum
Check brake lining contact pattern
Damaged brake lining surface
Check brake linings
Poor quality of brake linings
Check brake linings
Glazed brake linings
Check brake linings
Damaged brake shoes
Check brake shoes
Seized brake shoe bearing
Check brake shoe bearing
Loose brake camshaft bearing
Check brake camshaft bearing
Worn cam rollers/cam roller bearing
Check cam rollers/cam roller bearing
Incorrect operation/setting of load sensing valve
Check operation/setting of load sensing valve
Incorrect vehicle combination
Check vehicle combination
Incorrect ABS operation
Check ABS operation
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6
DIAGNOSTICS
Drum brake construction
CF65/75/85 series
2-4
SYMPTOM: VIBRATIONS DURING BRAKING
Possible cause
Remedy
Incorrect wheel tightening procedure
Tighten wheels according to tightening
procedure
Non-standard wheels fitted
Fit only standard wheels
Overload due to excessive loading
Check vehicle loading condition
Incorrect front axle/rear axle brake pressure
setting
Check front axle/rear axle setting
Incorrect quality of brake linings
Check brake linings
Incorrect turning of the brake linings Blunt tool
used during turning
Check brake linings
Loose brake lining on brake shoe
Check brake lining/rivets
Loose brake shoes
Check brake shoe attachment
Brake drums not or unsatisfactorily
reconditioned
Check brake drums
Different or poorer quality brake drums
Check brake drums
Cracked brake drums
Check length and depth of the cracks in the
brake drums
Deformed/oval-shaped brake drums
Check brake drums
Hardened areas in the brake drum due to
thermal overload
Check/replace brake drums
Play in cab suspension
Check cab suspension
Incorrect vehicle combination
Check vehicle combination
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6
CF65/75/85 series
Drum brake construction
DIAGNOSTICS
2-5
SYMPTOM: LOCKING OF THE BRAKES
Possible cause
Remedy
Incorrect setting of load sensing valve
Check setting of load sensing valve
Thermal overload of non-locking axle brake
linings
Check non-locking axle brake linings
Incorrect or non-reconditioned brake linings
Check brake linings
Blunt tool used during turning of the brake
linings
Check brake linings
Different or poorer quality brake drums
Check brake drums
Hardened areas in the brake drum due to
thermal overload
Check/replace brake drums
Loose brake camshaft bearing
Check brake camshaft bearing
Worn cam rollers/cam roller bearing
Check cam rollers/cam roller bearing
Incorrect system pressure due to incorrect
pressure regulator setting
Check the pressure regulator setting
Defective trailer vehicle brake system
Check trailer vehicle brake system
Incorrect vehicle combination
Check vehicle combination
Incorrect ABS operation
Check ABS operation
Tyres have too little profile
Check profile
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6
DIAGNOSTICS
Drum brake construction
CF65/75/85 series
2-6
SYMPTOM: INCREASED BRAKE LINING WEAR
Possible cause
Remedy
Overload due to excessive loading
Check vehicle loading condition
Incorrect foot brake valve stop bolt setting
(residual pressure)
Check foot brake valve setting
Incorrect setting of load sensing valve
Check setting of load sensing valve
Incorrect vehicle combination or front axle/rear
axle combination
Check vehicle combination or front axle/rear
axle combination
Defective trailer vehicle brake system
Check trailer vehicle brake system
Highly contaminated brakes, seized brake shoe
pivot points
Check brake shoe freedom of movement, clean
brakes
Different/incorrect quality of brake linings
Check brake linings
Return spring too slack or broken
Check return spring
Defective brake adjuster
Check automatic brake adjuster
Cracked brake drums
Check length and depth of the cracks in the
brake drums
Air pressure in spring brake cylinders too low
during driving, dragging brakes
Check air pressure in spring brake cylinders
with the parking brake valve in the driving
position
Dragging brakes because parking brake is not
released
Check release of parking brake
Dirt under foot brake valve/floor mat too high
Check for free movement of foot brake valve
Contaminated/blocked brake valve vents
Check valve vents
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