18
5
M
» Y081564 - (EN - REV. 003) | JUNE 2022
FUNCTIONAL AND VISUAL CHECK
If these recommendations are ignored, there is a
danger of brake failure and therefore increased
safety risk.
Brake Disc
5.1.6 Measure the thickness of the brake disc at the thinnest
point. Be aware of possible burring at the edge of the disc.
M
= Total thickness of the brake disc
New condition =
45 mm
.
Worn condition =
37 mm
or
N = 0 mm
- the disc must be
replaced.
If the disc dimension
M ≤ 39 mm
or
N ≤ 1 mm
, it is recommended
that all brake discs on the same axle be renewed when the brake
pads are changed.
Brake discs from Knorr-Bremse have an optical wear indicator
as a chamfer on the outer edge of the disck (
N
). Therefore the
brake disc wear should be checked whenever the brake pads are
checked (see Fig.).
New Brake Disc
Worn Brake Disc
5.1.6 - Brake disc thicknesses and optical wear indicator
N
N
M
M
N
N
