PREVOST X3-45 COMMUTER User Manual

SECTION 12: BRAKE AND AIR SYSTEM
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
45
FIGURE 50: FREE MOVEMENT OF CALIPER > 0.984 IN /
25 MM
16.2.9 Clearance Measurement Check of
Bearing Variants (6)
Note: Before commencing (removing the
wheel), make sure there is no contact between
caliper and axle, vehicle, chassis sections or
carrier. In such cases, it will be necessary to
replace the caliper bearings (see Knorr-Bremse
Pneumatic Disc Brake Y006471 Service
Manual.).
To measure the clearance, the following steps
must be taken:
1. Remove the wheel.
2. Remove pad retainer.
To achieve the correct reading it is necessary to
have a pair of new brake pads fitted. If the
clearance measuring is not taking place during a
brake pad replacement, the current position of
the assembled pads must be noted before
removing, so that they can be re-assembled in
the same position.
Remove old pads and replace with a pair of new
pads.
3. Fasten a magnetic dial-gage holder to the
carrier (2) on the floating bearing side of
the caliper (1). Use the casting tag on the
caliper (1) as the measuring point - see
arrows A (see Figure 51).
4. Set the dial gage to zero.
5. Place a suitable tool (e.g. screwdriver with
at least 200 mm in length) in a central
position between carrier (2) and caliper (1)
and lever them in opposite directions (us-
ing normal hand-force).
6. Read the maximum value of the bearing
clearance on the dial gage and compare
with the values in the table (see Table).
If the clearance exceeds the given tolerance, the
complete bearing will need replacing using the
relative service kit.
If the clearance measuring is not taking place
during a brake pad replacement, the new pads
should be removed and the previously marked
brake pads fitted in their original positions,
otherwise renew the brake pads as an axle set
and adjust the air gap (refer to Knorr-Bremse
Pneumatic Disc Brake Y006471 Service
Manual).
7. Fit the wheels. After replacing the wheel
check that it runs interference free.
FIGURE 51: OBTAINING MAXIMUM VALUE OF BEARING
CLEARANCE

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in