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CanadaScored surface
aPPearance
Disc featuring scored surface.
cause
Pads fitted with friction material too harsh for the disc or new pads assembled on excessively worn out discs.
effect
Reduction in braking performance and possible imbalance on the affected axle during braking.
remedy
- Replace the pads.
- Check disc condition and minimum thickness.
If necessary, replace the disc. - Check for the quality of the spare parts used.
blue stripes
aPPearance
Blue stripes on the disc indicating a physical change due to overheating.
cause
Intensive use of brakes for prolonged braking or improper downhill braking.
effect
Brake disc overheating which may result in contact surface distortion and cracks.
remedy
- Compulsory replacement of brake discs and pads.
- During the first 250 km after replacement, sharp braking should be avoid in order to allow for the correct bedding-in of the newly fitted components.
degree crack
aPPearance
Disc surface features 1st and 2nd degree crack.
cause
Too intensive use of brakes due to the track features or to the carried load.
effect
Possible unexpected disc mechanical collapse, particularly with 2nd degree crack.
remedy
- Compulsory replacement of brake discs and pads, particularly with 2nd degree crack, when one of the cracks is travelling from OD to ID.
- Brake calipers shall be checked.
contaminated pad
aPPearance
Contaminated pad friction material.
cause
Contamination by an oily substance or solvent.
effect
Reduction in braking performance and possible imbalance during braking.
remedy
- Replace the pads.
- Check the discs on the axle.
- Identify any fluid leaks from the hubs or other nearby components.
glazed pad
aPPearance
Glazed pad friction material.
cause
Very low duty applied on the brakes, i.e. brake applications with low speed and low pressure.
effect
Reduction in braking performance and typical noise (squeal) while braking.
remedy
- If glazing is not too heavy can try to recondition the surface by some mileage of medium/hard brake duty, otherwise replace the pads.
- Check the disc condition and minimum thickness.
detached friction material
aPPearance
Detached friction material.
cause
Possible excessive load or heavy braking, along with the choice of unsuitable parts.
effect
Reduction in braking performance and typical noise (squeal) while braking.
remedy
- Replace the pads.
- Check the disc condition and minimum thickness.
- Despite having a wear indicator, it is necessary to check the pad condition every normal garage brake control visit and/or every six months.
Uneven wear ( brake pad)
aPPearance
Uneven brake pad wear.
cause
One of the calipers has become stuck or does not return correctly to the rest position.
effect
Reduction in braking performance and possible inbalance on the involved axle, during braking.
solution
- Replace the pads.
- Brake calipers should be checked.
metal friction
aPPearance
Friction includes metal pick-up.
cause
High temperature generated between brake shoe and disc in wet conditions.
effect
Wear of the affected brake disc with typical metal rubbing noise during braking.
solution
- Replace the pads.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
surface cracks
aPPearance
Pad with surface cracks.
cause
Excessive load or high friction material temperature.
effect
Possible detachment of friction material resulting in a reduction in braking performance.
solution
- Replace the pads.
- Check for correct caliper operation.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
excessively worn
aPPearance
Excessively worn out discs and pads.
cause
Possible contamination of the friction material by sand, mud or earth or incomplete return of the caliper gear.
effect
Excessive wear of one or more brake pads, resulting in damage where the pad has not been fitted with a wear indicator.
solution
- Replace the pads.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
uneven wear (pads axle)
aPPearance
Pads on the same axle featuring uneven wear.
cause
Incorrect return of one caliper on the same axle.
effect
If the axle involved is the directional one, this fault may result in vehicle instability during brake release.
solution
- Replace the pads.
- Check for the proper caliper operation.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
Edge Crumbling
aPPearance
Uneven wear pattern on the pad
cause
Brake pad is sticking within the caliper causing the brake pad to stay in contact with the disc with associated excessive pad temperature
effect
Pad surface may glaze reducing brake performance
remedy
- Investigate cause of caliper sticking
- Maintain the caliper
- Replace the brake pad set
Scored surface
aPPearance
Disc featuring scored surface.
cause
Pads fitted with friction material too harsh for the disc or new pads assembled on excessively worn out discs.
effect
Reduction in braking performance and possible imbalance on the affected axle during braking.
remedy
- Replace the pads.
- Check disc condition and minimum thickness.
If necessary, replace the disc. - Check for the quality of the spare parts used.
blue stripes
aPPearance
Blue stripes on the disc indicating a physical change due to overheating.
cause
Intensive use of brakes for prolonged braking or improper downhill braking.
effect
Brake disc overheating which may result in contact surface distortion and cracks.
remedy
- Compulsory replacement of brake discs and pads.
- During the first 250 km after replacement, sharp braking should be avoid in order to allow for the correct bedding-in of the newly fitted components.
degree crack
aPPearance
Disc surface features 1st and 2nd degree crack.
cause
Too intensive use of brakes due to the track features or to the carried load.
effect
Possible unexpected disc mechanical collapse, particularly with 2nd degree crack.
remedy
- Compulsory replacement of brake discs and pads, particularly with 2nd degree crack, when one of the cracks is travelling from OD to ID.
- Brake calipers shall be checked.
contaminated pad
aPPearance
Contaminated pad friction material.
cause
Contamination by an oily substance or solvent.
effect
Reduction in braking performance and possible imbalance during braking.
remedy
- Replace the pads.
- Check the discs on the axle.
- Identify any fluid leaks from the hubs or other nearby components.
glazed pad
aPPearance
Glazed pad friction material.
cause
Very low duty applied on the brakes, i.e. brake applications with low speed and low pressure.
effect
Reduction in braking performance and typical noise (squeal) while braking.
remedy
- If glazing is not too heavy can try to recondition the surface by some mileage of medium/hard brake duty, otherwise replace the pads.
- Check the disc condition and minimum thickness.
detached friction material
aPPearance
Detached friction material.
cause
Possible excessive load or heavy braking, along with the choice of unsuitable parts.
effect
Reduction in braking performance and typical noise (squeal) while braking.
remedy
- Replace the pads.
- Check the disc condition and minimum thickness.
- Despite having a wear indicator, it is necessary to check the pad condition every normal garage brake control visit and/or every six months.
Uneven wear ( brake pad)
aPPearance
Uneven brake pad wear.
cause
One of the calipers has become stuck or does not return correctly to the rest position.
effect
Reduction in braking performance and possible inbalance on the involved axle, during braking.
solution
- Replace the pads.
- Brake calipers should be checked.
metal friction
aPPearance
Friction includes metal pick-up.
cause
High temperature generated between brake shoe and disc in wet conditions.
effect
Wear of the affected brake disc with typical metal rubbing noise during braking.
solution
- Replace the pads.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
surface cracks
aPPearance
Pad with surface cracks.
cause
Excessive load or high friction material temperature.
effect
Possible detachment of friction material resulting in a reduction in braking performance.
solution
- Replace the pads.
- Check for correct caliper operation.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
excessively worn
aPPearance
Excessively worn out discs and pads.
cause
Possible contamination of the friction material by sand, mud or earth or incomplete return of the caliper gear.
effect
Excessive wear of one or more brake pads, resulting in damage where the pad has not been fitted with a wear indicator.
solution
- Replace the pads.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
uneven wear (pads axle)
aPPearance
Pads on the same axle featuring uneven wear.
cause
Incorrect return of one caliper on the same axle.
effect
If the axle involved is the directional one, this fault may result in vehicle instability during brake release.
solution
- Replace the pads.
- Check for the proper caliper operation.
- Check disc condition and minimum thickness.
- If necessary, replace both discs on the axle.
Edge Crumbling
aPPearance
Uneven wear pattern on the pad
cause
Brake pad is sticking within the caliper causing the brake pad to stay in contact with the disc with associated excessive pad temperature
effect
Pad surface may glaze reducing brake performance
remedy
- Investigate cause of caliper sticking
- Maintain the caliper
- Replace the brake pad set