Iveco Stralis AT/AD. Manual

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

115

TRALIS

AT/AD

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).

TRALIS

AT/AD

116

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

117

TRALIS

AT/AD

For Rockwell type brakes

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Iveco Stralis AT/AD. Manual - part 264