How to determine whether the need to replace the brake disc

Update:04-08-2016
Summary:

Determine whether the brake disc needs replacement, can […]

Determine whether the brake disc needs replacement, can be judged by the following three ways:

1) Listen to the sound: If you tap the brakes at the same time accompanied by "iron rub iron" sloppy sound or squeak (also may be the brake pads in the beginning of the installation run-in effect), then the brake must be immediately replace. Because the limit markings on both sides of the brake pad have been directly friction brake disc to prove that the brake pads have exceeded the limit.

Encounter this situation, in the replacement of brake pads at the same time with the brake disc to check, when this sound often brake disc has been damaged, scratches, this time even if the replacement of new brake pads still can not eliminate the sound, it is recommended timely Replace the brake disc.

In addition, some poor quality brake pads have hard spots, this will also produce abnormal sound, the general situation such abnormal sound will be worn off after a period of disappearance.

2) Usually brake lights on the dashboard lights are lit as a brake should not be judged on the basis of the disc. The indicator light is generally off, when the brake disc failure or excessive wear, the light is lit, turn off after the repair. When the warning light is on, the brake disc has been worn to the limit, the braking effect has been reduced, greatly affecting the driving safety, therefore, we recommend regular checks of brake disc wear to see if it can be used, rather than just believe the warning light.

3) look at the thickness: Most brake disc products have wear indicators, that is, the distribution of three small pits on the disk. Use a vernier caliper to measure the depth of the pit to 1.5mm. That is to say, the total wear depth on both sides of the brake disc reaches 3mm. When the quasi-wear and complete wear shown in the figure below appear, we suggest to replace the brake disc in time.
Of course, not all brake discs have wear indicators. We can use your finger in the outer edge of the touch of the child can touch to determine the approximate depth. In general, if both sides of the brake disc total wear depth of 3mm, it should promptly replace the brake disc.

In addition, when both sides of the brake disc (drum) using different brands of different specifications, resulting in friction effect is different, resulting in both brake effect is not the same, will lead to braking deviation, poor braking effect and braking distance is far from the adverse consequences. It is suggested that both sides of the coaxial brake pads (shoes) at the same time to replace, in order to ensure the same braking effect.