Disc Brakes; Inspection Points - PREVOST H3-41 Maintenance Manual

SECTION 12: BRAKE AND AIR SYSTEM
and brake adjustment (refer to subsequent
headings in this section for more details). Ensure
all fasteners are tight (refer to "Torque Tables"
for recommended tightening torques).

18. DISC BRAKES

Knorr-Bremse SN7 disc brakes are used on all
axles. The front and drive axle discs are
actuated by 24 inch
2
chambers (22 inch for front I-Beam axle), while
2
on tag axle, the brake chambers have a 14 inch
effective area for service brake and a 16 inch
effective area for emergency/parking brakes.
The Knorr-Bremse SN7 brakes are supplied with
automatic clearance adjusters as standard
equipment for easier adjustment.
For detailed maintenance procedures, refer to
Knorr-Bremse Pneumatic
Y006471 Service Manual included on the
Technical Publications USB flash drive and also
available on Prevost Technical Publications site.
18.1

INSPECTION POINTS

The following inspection points will ensure long-
life and trouble-free operation of the disc brake.
MAINTENANCE
Check brake pad wear visually (this is
independent of any electronic wear indicator
fitted to the vehicle), visually check condition of
the adjuster cap, guide pin & rubber bush/guide
sleeve covers at the intervals specified by the
Lubrication and Servicing Schedule in Section
24: LUBRICATION & SERVICING..
26 PA1621 Maintenance Manual All Series | Revised June 2020
effective area air brake
Disc Brake
MAINTENANCE
With every pad replacement or once a year
whichever comes first:
1. Check
adjuster (see 18.2.6).
2. Check that caliper operates smoothly
over its full range of movement (see
18.2.6).
3. Check the adjuster cap for correct fitting
2
and condition (item 37).
2
4. Check the sealing elements for correct
fitting and condition (items 9, 58) (see
18.2.10 & 18.2.11).
5. Check the caliper bearing in the area of
the rubber bush/guide sleeve (item 6)
(see 18.2.8 step 2).
6. Check the caliper running clearance
(see 18.2.7).
7. Check fitting and condition of the cover
(item 10) and cover (item 68).
MAINTENANCE
Moisture and dirt is the enemy. Special care
should be awarded to the condition of the
various sealing elements, boots and caps to
prevent any moisture or dirt intrusion in the
caliper. Any missing or damaged sealing
element, boot or cap should be replaced
immediately.
At each pad replacement, make sure the caliper
operates smoothly over its full range of
movement. If the caliper shows the following
signs, replacement of the rubber bush/guide
sleeve (item 6, Figure 17), guide pin (items 4 & 5
Figure 18, screw (items 39 & 40) and cap (items
10 & 68) is required.
• excessive or abnormal play
• movement along guide pins is hard or
impossible (due to corrosion or dirt)
• A missing guide pin cap
If an individual wheel has heated abnormally,
please refer to Bendix BW7514_Single wheel
end thermal overload checklist. This checklist
will help you through standard verifications
correct functioning of the