Troubleshooting

Most common problems

It is essential that both brake discs are replaced at the same time - never replace only one disc.
Replacing only one disc can result in "out of balance" braking and could be dangerous.

Disc Judder

Possible Reasons
Excessive wear of caliper slide pins or bushes
Excessive play in the steering and suspension joints/bushes
Incorrect adjustment or play in front wheel bearings
Damaged wheels or tyres
Incorrect wheel nut / stud torque
Wheel imbalance

Most Common Reasons:
Disc Distortion
This is critical to the efficiency of the disc.
Only one discs needs to distort before you start to experience judder.
The maximum run out acceptable on a disc is 0.05mm (2/1000").
If your run out is more than this then remove the disc, clean hub again and ensure
there is no grit, rust or scale. Rotate the disc one bolt hole, bolt disc on and
check the torque settings are even all round.

Disc Thickness Variation
Because the highest point of the pad always touches the disc first it
gradually wears the disc thinner at this point - this has the result of
thickness variation which can show through judder.
This will usually cause one set of pads to wear faster and increase the amount of brake dust.

Brake Fluid Contamination

Regular brake fluid checks and changes are essential to safety.

· Minimal amounts of contamination can cause serious problems leading to
poor brake performance and even complete failure.

· Always store brake fluid in its original container.

· Brake fluid gradually absorbs moisture - water contamination greatly lowers the
boiling point and increases the viscosity of the brake fluid.

· Always store brake fluid separately from petroleum products, automotive
specialty products or any other workshop maintenance products.

· Only use new brake fluid for flushing the system - never use flushing fluid,
alcohol or other solvents

· Always try to use new, clean brake fluid to clean brake parts