DAF CF65, CF75, CF85 Series . Manual — part 877
6
CF65/75/85 series
Drum brake construction
DIAGNOSTICS
2-7
SYMPTOM: DAMAGED BRAKE DRUMS
Possible cause
Remedy
Overload due to too large brake load
Check vehicle load situation and vehicle use
Poorer quality of brake drums
Check quality/make of brake drums
Incorrect wheel tightening procedure
Tighten wheels according to tightening
procedure
Highly contaminated brakes
Clean brakes
Incorrect quality of brake linings
Replace brake linings
Incorrect turning of the brake linings, brake
lining is incorrectly positioned against the brake
drum
Check brake linings
Loose brake camshaft bearing
Check brake camshaft bearing
Brake drums reconditioned more than
maximum permitted diameter
Replace brake drums
Incorrect operation of double-check function in
the brake system
Check brake system double-check function
1
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6
DIAGNOSTICS
Drum brake construction
CF65/75/85 series
2-8
SYMPTOM: DAMAGED BRAKE LININGS
Possible cause
Remedy
Overload due to too large brake load
Check vehicle load situation and vehicle use
Highly contaminated brakes
Clean brakes
Poor quality of brake linings
Check quality/make of brake linings
Frozen or rusted brakes released by using
force
Replace brake linings
Incorrect turning of the brake linings Blunt tool
used during turning
Check/replace brake linings
Rivet pressure too high during installation of
brake linings on brake shoes
Apply correct rivet pressure during installation
of brake linings on brake shoes
Rivet pressure too low during installation of
brake linings on brake shoes Loose brake lining
on brake shoe
Apply correct rivet pressure during installation
of brake linings on brake shoes
Incorrect sequence when applying rivets during
installation of brake linings on brake shoes
Follow correct sequence when installing the
brake lining
Deformed and/or damaged brake shoes
Check/replace brake shoes
Damaged lining due to broken return spring
Check return spring
1
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6
CF65/75/85 series
Drum brake construction
DIAGNOSTICS
2-9
SYMPTOM: DRAGGING BRAKES
Possible cause
Remedy
Incorrect foot brake valve stop bolt setting
(residual pressure)
Set stop bolt
Leaking foot brake valve to circuit 1 and/or 2
Check the foot brake valve for leaks
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
Highly contaminated brakes, seized brake shoe
pivot points
Check brake shoe freedom of movement, clean
brakes
Broken or too slack return springs between the
brake shoes.
Check return spring
Incorrect type of brake lining
Check type and size of brake lining
Brake camshaft freedom of movement
Check brake camshaft freedom of movement
Defective brake adjuster
Check automatic brake adjuster
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
1
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6
DIAGNOSTICS
Drum brake construction
CF65/75/85 series
2-10
1
ᓻ 200324
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