Checking Sealing Elements - Tappets And Boot Assemblies; Pad Replacement - PREVOST H3-41 Maintenance Manual

The floating bearing side with guide pin (4c, 4d
or 4e) is sealed with inner boot (9c, 9d or 9e)
and with cover (68c 68d or 68e). All variants (9),
(10) and (68) must be free of any signs of
damage (see Figure 43).
Check for correct location and fitting.
If necessary, remove pads (12) to inspect the
inner boots (9).
If necessary, repair caliper with suitable service
kit.
FIGURE 44: CHECKING OF GUIDE PIN AND SEALS
18.2.11 Checking Sealing Elements – Tappets
and Boot Assemblies
Remove pads (12) (refer to Knorr-Bremse
Pneumatic Disc Brake Y006471 Service
Manual).
Screw out the tappets (13) using the shear
adapter (61) clockwise until the boots are clearly
visible (see Figure 44).
The tappets must not be extended more
than 1.181 in / 30 mm, otherwise
synchronization is lost and the caliper
must be replaced.
SECTION 12: BRAKE AND AIR SYSTEM
FIGURE 45: SCREW OUT TAPPETS - MAX. 1.181 IN / 30
MM
The rubber boots on the tappets (13) must
not have any cuts/tears or show any other
signs of damage. Check for correct location
and fitting.
FIGURE 46: CHECK RUBBER BOOTS FOR DAMAGE
Note: The penetration of dirt and moisture into
the brake will lead to corrosion and impair the
function of the clamping mechanism and wear
adjuster.
If necessary replace tappet and boot assemblies
(refer to Knorr-Bremse Pneumatic Disc Brake
Y006471 Service Manual).
18.3

PAD REPLACEMENT

Brake pad replacement procedure has slightly
changed with the introduction of the new N2G
adjuster on the vehicles.
The full wording of the processes is included in
the latest Knorr-Bremse service manual.
Refer to Knorr-Bremse Pneumatic Disc Brake
Y006471 Service Manual.
After fitting new pads,
1. Turn the adjuster (thru shear adapter)
clockwise  until the pads come into
contact with the disc.
PA1621 Maintenance Manual All Series | Revised June 2020 39