Scratches, rust, saturated lining materials and wear | - If the vehicle is not driven for a long period of time, sections of the discs that are not in contact with the pads will become rusty, causing noise and shuddering.
- If grooves and scratches resulting from excessive disc wear are not removed prior to installing a new pad assembly, there will be inadequate contact between the disc and the lining (pad) until the pads conform to the disc.
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Run-out | Excessive run-out of the discs will increase the pedal depression resistance due to piston kick-back. |
Change in thickness (parallelism) | If the thickness of the disc changes, this will cause pedal pulsation, shuddering and surging. |
Inset or warping (flatness) | Overheating and improper handling while servicing will cause warping or distortion. |