17
max. 0.75
x
a
max. 1.5 mm
VF 00127/3
A
1
B
1
D
1
C
1
a
CAUTION!
Follow these recommendations. Excessive
Pad or Disc wear will degrade optimum performance.
At each change of Pads check the Rotors for grooves
and cracks.
The diagram at the right shows possible conditions
of the surface.
A
1
= Small cracks spread over the surface
are allowed
B
1
= Cracks less than 0.06in. (1.5mm) deep or wide,
running in a Radial direction,
are allowed
C
1
= Grooves (circumferencial) less than 0.06in. (1.5mm)
wide
are allowed
D
1
= Cracks in the vanes
are not allowed
and the
Rotor
MUST BE REPLACED
.
a
= Pad contact area
Note
In case of surface conditions A
1
,-C
1
, the Rotor can
remain in service until it has reached the minimum
thickness of 1.46in. (37 mm) is reached.
Knorr-Bremse Rotor are normally service-free and
refinishing, when changing Rotors, is not necessary.
However, refinishing could be useful, e.g. to increase
the load-bearing surface of the Pads, after severe
grooving on the entire friction surface has occurred.
To meet safety requirements, the minimum thickness
after refinishing is > 1.53in. (39 mm).
In addition, follow the recommendations provided by
the Vehicle Manufacturer.
