Iveco Stralis AT/AD. Manual - part 260
Braking stage
During braking, the diaphragm cylinder rod presses down on
the lever (30).
The force is transferred to the axle (15) by the bearing in an
off - centered position (31)
Through the threaded sleeves (2) and pistons (3), the force
is conveyed to the inner braking lining (28).
Once the play between brake linings (28) and brake disc (29)
has been recovered, the force is conveyed to the outer brake
lining (28), due to brake caliper displacement.
The brake linings (28) pressing on the brake disc (29)
produce the braking power.
Releasing stage
As soon as the pressure on the brake is reduced, the pressure
spring (17), the rear axle (15) along with threaded sleeves (2)
and lever (32) go back to their original positions.
Automatic play recovery
The brake is equipped with automatic adjustment device,
which keeps the operating play between brake linings and
brake disc constant.
Every time the brake is operated, the adjustment device (21),
which is integral with the lever (32), is automatically started.
If worn brake linings and brake discs increase the operating
play, the adjustment device (21) and drag link (13) turn the
threaded sleeves (2) so to recover said increase in play.
The operating clearance should be between 0.6 and 1.1 mm;
lower clearances might cause overheating problems.
CHECKS
Checking the automatic play recovery system
efficiency
40570
Figure 79
Remove the lock nuts and wheels, using hydraulic stand
99321024 (1).
60759
78622
Figure 80
Figure 81
Remove the plug (4) using the tab (3) and make sure the
adapter (2) is not lost.
Using a suitable wrench (1), rotate the adjustment pinion
counterclockwise by 2-3 with the adapter (2, Figure 80)
installed turns, thus increasing the play between brake linings
and brake disc.
Operate the brakes for about 5-10 times and make sure the
wrench (1) moves clockwise with small increments, up to
complete recover of play between braking linings and brake
disc.
Otherwise, i.e. if the wrench does not turn, turns just once
or turns in both directions, this means the automatic play
recovery system is faulty. Replace the caliper, following the
procedure given subsequently, then fit back the wheels.
!
Never turn the adjusting pinion (1) without fitting
the adapter (2) first. If the adapter cut torque is
overcome, the adapter gets broken.
Try again with a new adapter and if also in this case
it gets broken, the caliper should be replaced
because there is an inner damage.
2
4
1
S
TRALIS
AT/AD
98
AIR SYSTEM - BRAKES
Base - January 2003