Iveco Stralis AT/AD. Manual — part 264
60867
Figure 142
VIEW OF PERROT DRUM BRAKES
Figure 143
VIEW OF SIMPLEX TYPE DRUM BRAKES (ROCKWELL)
SECT. A-A
52875
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AT/AD
114
AIR SYSTEM - BRAKES
Base - January 2003
40511
Figure 144
Figure 145
Figure 146
For Perrot and Rockwell type drum brakes
527230
Removing the rear drum brakes
Set the vehicle on level ground. Take the covers off the nuts
fixing the wheel and loosen the nuts.
Lift the vehicle at the rear and put it on stands.
Position the hydraulic trolley 99321024 under the wheels.
Take out the nuts fixing the wheels and take them off.
Fully unscrew the manual brake release screw (2) of the
combined cylinder (1).
40512
Take out the screws fixing the brake drum (1) to the wheel
hub (2). Screw two appropriate screws (
⇒) into the holes in
the drum and take this out of the wheel hub.
For Perrot type drum brakes
40513
Disconnect the electrical connection (1) for the cable
signalling brake lining wear.
40514
Take out the shoe return springs (2).
Remove the top shoe (1).
Figure 147
Figure 148
40515
Free the brake wear indicator cable (1) from the clips of the
brake plate (3) and take the cable out of the guard (2).
Remove the bottom shoe (5).
Take out the semicircular plugs (4).
AIR SYSTEM - BRAKES
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5272
OVERHAULING THE DRUM BRAKES
Figure 149
Figure 150
Figure 151
40868
Figure 152
Figure 153
40516
Disconnect the pipes (1 and 2) from the fittings (3 and 4) and
remove these from the combined cylinder (5).
Using wrench 99356006 (7), loosen the ring nut (6).
Turning the combined cylinder (5) anticlockwise, remove it
from the brake body.
For Rockwell type brakes
Figure 154
40517
Extract the wedge-shaped control unit (1) from the brake
body (2).
40867
Unlock shoe (1) return springs (2) using pliers 9935711.
Remove shoe (1) and disconnect the electrical connection by
unscrewing brake lining wear indicator cable fastening nut set
on it.
Disconnect the brake cylinder (2) feeding pipes (1). Using
wrench 99356006 (3) loosen the ring nuts and remove the
brake cylinder (2).
40519
40518
Remove the protective caps (4) from the brake body (6) and
extract the adjustment units comprising parts (1, 2, 3, 4 and 5).
For Perrot type brakes
Unscrew guide screws (6 and 7) and take parts (1, 2, 3, and
4) off brake body (5).
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AIR SYSTEM - BRAKES
Base - January 2003
Figure 155
Figure 156
Figure 157
Figure 158
40872
40869
40870
60217
Take away the wedge units (1) controlling the brake housing (2).
Take away the adjusting units (1 and 3) from the brake housing
(2).
Remove the guide screws (2) and remove the thrust pins (1)
with the adjustment bushes and relevant springs.
Remove thrust pins (3).
Remove the wheel and the whole braking unit on the opposite
side. Keep components separate.
Check the wear on the pin seats of the brake housing (1), if they
are scored or very worn replace the faulty brake housings.
For Rockwell and Perrot type brakes
Check the wear on the drums to decide whether they can be
re- used.
Measure the drum diameters with a gauge without bending
the arms.
Measure the diameter in several points to establish the ovality
and wear, also taking into consideration the depth of scores
on the braking surface.
Allowed tolerance for ovality and/or eccentricity is 0.25 mm
If the braking surface scoring or wear cannot be repaired by
turning, or if there are evident signs of overheating, replace the
drum (see Specifications and data table).
Check the conditions of the brake shoes, if they are cracked
replace them.
If the brake lining surfaces show signs of grease, find the cause
and remove it.
The minimum thickness admitted for the brake linings is 4.7
mm, measured at the last rivet of the shoe with the wear sensor
on the side opposite the cylinder.
If a value that is under, or only just over the specified thickness,
replace.
Check the integrity and/or efficiency of the brake lining wear
indicator cable.
Check the integrity and/or efficiency of the shoe return springs.
AIR SYSTEM - BRAKES
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For Rockwell type brakes
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