SECTION 12: BRAKE AND AIR SYSTEM
24
PA1621 Maintenance Manual All Series | January 2017
FIGURE 25: PAD WEAR CHECK FRONT AND TAG AXLE
27.4 BRAKE PADS AND DISCS MINIMAL
TOLERANCE LIMITS
27.4.1 Brake Pads
The thickness of the pads must be checked
regularly dependent on the usage of the vehicle.
The pads should be checked corresponding to
any legal requirements that may apply. Even if a
wear indicator is fitted and connected, this must
be at least every 12 months.
FIGURE 26:MINOR BREAKOUTS AT THE EDGES ARE
PERMITTED (SEE ARROW)
FIGURE 27:MAJOR BREAKOUTS ON THE SURFACE OF
THE BRAKE PAD ARE NOT PERMITTED
If the thickness of the friction material at its
thinnest point is less than 0.079 inch or 2 mm
(measurement C), the pads must be replaced.
A= Overall thickness of new brake pad: 1.18
in (30 mm)
B= Back plate SN7 type: 0.354 in (9 mm)
C= Minimal thickness of friction material:
0.079 in (2 mm)
D= Minimum allowed thickness in worn
condition for back plate and friction
material: 0.433 in (11 mm)
FIGURE 28: FRONT AXLE BRAKE AIR CHAMBER 12158
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