Wear Check Of Pads/Disc - Drive Axle Equipped With A Rubber Bushing And Exposed Guide Pin; Wear Check Of Pads/Disc - Front And Tag Axle - Equipped With Visual Wear Indicator - PREVOST H3-41 Maintenance Manual

FIGURE 27: TOLERANCES
CRACKS AND GROOVES
18.2.3 Wear Check of Pads/Disc – Drive Axle
Equipped With a Rubber Bushing and
Exposed Guide Pin
The pads/disc wear can be visually determined
without removing the wheel by checking the
position of the caliper (1) compared to the fixed
guide pin (4).
MEASUREMENT "C" WITH NEW BRAKE PADS AND
DISC
AND EXAMPLES OF
PA1621 Maintenance Manual All Series | Revised June 2020
SECTION 12: BRAKE AND AIR SYSTEM
MEASUREMENT "C" WITH WORN DISC/BRAKE PADS
FIGURE 28: BRAKE PAD WEAR CHECK ON THE DRIVE
AXLE
If measurement "C" is less than 0.039" (1 mm),
this condition requires a check of the brake pad
thickness and the brake disc with the wheel
removed. If any minimal tolerance limits have
been reached, the pads and/or disc must be
changed.
18.2.4 Wear Check of Pads/Disc – Front and
Tag Axle – Equipped With Visual 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 29), if 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), 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.
Refer to Knorr-Bremse Pneumatic Disc Brake
Y006471 Service.
33