DAF CF65, CF75, CF85 Series . Manual — part 875
6
CF65/75/85 series
Disc brake construction
DIAGNOSTICS
1-3
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
Wrong brake pad quality
Check brake pads
Dirt/deposits on brake disc
Check/clean brake disc
Loose parts
Check disc brake construction
Wear/damage to hub bearing
Check hub bearing play
Damage to disc brake
Check thickness and condition of brake disc
Play in cab suspension
Check cab suspension
Incorrect vehicle combination
Check vehicle combination
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
pads
Check non-locking axle brake pads
Incorrect system pressure due to incorrect
pressure regulator setting
Check 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
Brake pad stuck in the brake calliper. Incorrect
play between brake pads and brake carrier
Check the play between brake pads and brake
carrier
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6
DIAGNOSTICS
Disc brake construction
CF65/75/85 series
1-4
SYMPTOM: INCREASED BRAKE PAD WEAR
Possible cause
Remedy
Overload due to excessive loading
Check vehicle loading condition
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
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
Brake pad stuck in the brake calliper. Incorrect
play between brake pads and brake carrier
Check the play between brake pads and brake
carrier
Incorrect setting of the trailer vehicle control
valve/trailer vehicle reaction valve
Check setting of the trailer vehicle control
valve/trailer vehicle reaction valve
SYMPTOM: DRAGGING BRAKES
Possible cause
Remedy
Leaking foot brake valve to circuit 1 and/or 2
Check the foot brake valve for leaks
Dirt/deposits in brake calliper of disc brake
Check freedom of movement of brake calliper
Brake pads set too tightly
Check minimum brake pad play
Air pressure in spring brake cylinders too low
during driving
Check output pressure of the
double-check relay valve
Check four-circuit safety valve for
contamination
Check output pressure of the parking brake
valve in the driving position
Output supply pressure from trailer vehicle
control valve to trailer/semi-trailer too low
Check output supply pressure of the trailer
vehicle control valve
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
Brake pad stuck in the brake calliper. Incorrect
play between brake pads and brake carrier
Check the play between brake pads and brake
carrier
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6
CF65/75/85 series
Drum brake construction
DIAGNOSTICS
2-1
2. DRUM BRAKE CONSTRUCTION
2.1 FAULT-FINDING TABLE
SYMPTOM: SQUEALING OF THE BRAKES
Possible cause
Remedy
Loose brake shoes
Check brake shoe attachment
Loose brake lining on brake shoe
Check brake lining/rivets
Incorrect turning of the brake linings, brake
lining is incorrectly positioned against the brake
drum
Check brake lining contact pattern
Incorrect quality of brake linings
Check brake linings
Brake drums not or unsatisfactorily
reconditioned
Check brake drums
Different or no standard quality of brake drums
Check brake drums
Maximum brake drum reconditioning dimension
exceeded
Check brake drums
Cracked brake drums
Check length and depth of the cracks in the
brake drums
Loose brake camshaft bearing
Check brake camshaft bearing
Worn cam rollers/cam roller bearing
Check/replace cam rollers/cam roller bearing
Incorrect vehicle combination
Check vehicle combination
Incorrect front axle/rear axle brake pressure
setting
Check front axle/rear axle setting
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DIAGNOSTICS
Drum brake construction
CF65/75/85 series
2-2
SYMPTOM: VEHICLE PULLS TO ONE SIDE DURING BRAKING
Possible cause
Remedy
Worn brake lining/drum
Check brake lining/drum
Difference in tyre pressure
Check/correct tyre pressure
Difference in tyre size
Check tyres
Different quality of brake linings
Check brake linings
Incorrect turning of the brake linings, brake
lining is incorrectly positioned against the brake
drum
Check brake lining contact pattern
Different brake shoe return springs, too slack
Check brake shoe return springs
Brake linings affected by grease or oil
Check seals and/or cam rollers for excess
grease or oil
Damaged brake lining surface
Check brake linings
Non-tapered brake linings
Check brake linings
Different brake cylinder diameters
Check brake cylinder diameters
Broken springs in brake cylinders
Check brake cylinders
Leaking brake cylinders
Check brake cylinders
Fouled brake cylinders
Check brake cylinders for fouling
Defective brake adjuster(s)
Check automatic brake adjuster
Incorrectly set brake adjuster travel
Check brake adjuster travel setting
Brake camshaft freedom of movement
Check brake camshaft freedom of movement
Excessive stub axle bearing play
Check stub axle bearing play
Excessive steering ball joint play
Check steering ball joint play
Excessive shackle pin play
Check shackle pin play
Incorrect vehicle combination
Check vehicle combination
Incorrect ABS operation
Check ABS operation
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