SECTION 12: BRAKE AND AIR SYSTEM
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
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FIGURE 27: BRAKE PAD WEAR CHECK ON DRIVE AXLE
If the side of the caliper (flat surface around
guide pin cap) lines up with the tip of the wear
indicator, then the brake pad thickness and the
brake disc must be checked with the wheel
removed. If any minimal tolerance limits have
been reached, the pads and/or disc must be
changed.
Please refer to Knorr-Bremse Y006471 Service
Manual for further information on wear check of
pads and brake discs.
25.3.2 Front and Tag Axle – Equipped With L-
bracket Wear Indicator
The condition of the pads can be checked
without removing the wheel by checking the
position of the caliper compared to the tip of the
wear indicator or carrier depending on vehicles.
In one variant of the visual wear indicator
(Figure 28), the side of the caliper (flat surface
around guide pin cap) lines up with the tip of the
wear indicator (i.e. measurement “A” would be
0.0 in). In this condition, the brake pad thickness
and the brake disc must be checked with the
wheel removed. If any minimal tolerance limits
have been reached, the pads and/or disc must
be changed.
Alternately, brake pad wear can be checked
using carrier to caliper position. When points “P”
and “R” align, the brake pad thickness and brake
disc must be checked with the wheels removed
(Figure 29). If any minimal tolerance limits have
been reached, the pads and/or disc must be
changed.
Please refer to
Knorr-Bremse Service Manual
for additional details.
FIGURE 28: PAD WEAR CHECK FRONT AND TAG AXLE
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FIGURE 29: PAD WEAR CHECK FRONT AND TAG AXLE
