Meritor Automobile Accessories MM-9902 Manuel D’Utilisation
12
Heat Checking
Heat checks are cracks in the surface of the disc
caused by heat. Heat checking can be light or
heavy.
Light Heat Checking
Light heat checking is very fine, tight, small
cracks. Light heat checking is normal. You can
continue to use a disc with light heat checking.
Disc
CAUTION
You must always replace a damaged disc.
1. When you inspect the brakes, inspect both
1. When you inspect the brakes, inspect both
sides and the outer diameter of the disc for
the following conditions:
•
Cracks
•
Heat checking
•
Grooves or scoring
•
Blue marks or bands
2. When you reline the brakes, you must
measure the thickness of the disc.
Cracks
When a crack extends deep into a section of the
disc, replace the disc. Figure 5.2.
Figure 5.2
Heavy Heat Checking
Heavy heat checking is surface cracks with
width and depth. Figure 5.3. If you find heavy
heat checking, always replace the disc.
Deep Grooves or Scores
Check both sides of the disc for deep grooves or
scores. If the grooves or scores are not too
deep, you can continue to use the disc.
Figure 5.4.
Figure 5.4
Figure 5.3