Iveco EuroCargo (12 to 26 t). Manual — part 186
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 91
Remove the lock nuts and wheels, using hydraulic stand
99321024 (1).
60759
78622
Figure 92
Figure 93
Remove the plug (4) using the tab (3) and make sure the
adapter is not lost.
Using a suitable wrench (1), rotate the adjustment pinion
counterclockwise by 2-3 with the adapter (2, Figure 92)
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.
E
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12-26 t
PNEUMATIC SYSTEM - BRAKES
89
Base - February 2003
Figure 94
Figure 95
49155
The operation can be performed with assembled wheels.
Remove protection cap (1) (available only on SB6 type
calipers)
49156
SECTIONS ON SB6 BRAKE CALIPER
1. Brake caliper SB6 - 2. Rubber guide bush - 3. Sliding bushing
A. Sliding bushing position with new gaskets - A
1
1
. Sliding bushing position with worn braking gaskets (carry out an accurate
check with disassembled wheels)
A1
Verify that A is greater than 0 mm, for SB6 type calipers
(Figure 95), or greater than 1 mm, for SN6 and SN7 types
calipers (Figure 96).
Otherwise it is necessary to disassemble the wheels and
proceed with an accurate check as described below.
E
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C
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12-26 t
90
PNEUMATIC SYSTEM - BRAKES
Base - February 2003
Figure 96
78625
SECTIONS ON SN6/SN7 BRAKE CALIPER
1. Brake caliper - 2. Rubber guide bush - 3. Sliding bushing
A. Sliding bushing position with new gaskets - A1. Sliding bushing position with worn braking gaskets (carry out an accurate
check with disassembled wheels)
E
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C
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12-26 t
PNEUMATIC SYSTEM - BRAKES
91
Base - February 2003
!
Never operate directly on the registration pinion (1)
without having first of all fitted the adapter (2). If the
cutting torque of the adapter is exceeded, this will
break.
Test with a new adapter. If this also breaks, the caliper
must be replaced because it is damaged.
40569
49157
40570
Figure 97
Figure 98
Figure 99
Figure 100
Figure 101
Figure 102
Arrange the vehicle on a plane ground and lock its rear wheels;
loosen nuts (1) securing the front wheels.
With an hydraulic jack lift the vehicle from its front side and
rest it on two support stands (2).
Unscrew securing nuts and with hydraulic trolley 99321024
(1) detach the wheels.
Remove screw (1) and plate (2) for checking wear sensor
cables.
49158
Remove and disconnect the electric connections (1) from the
caliper body. Remove the split pin (2), pin (3) and plate (4)
fastening the brake linings.
!
Do not fasten any lifting device on the plate (4).
Remove cap (3), act on adjusting unit (1) with the adapter
fitted, by means of a wrench, in a counter-clockwise direction,
so as to make pistons go back into the caliper body, then
remove braking gaskets (5) by properly floating caliper body
(4).
60862
Press (
→) the spring (1) and remove it; replace it with a new
one if necessary.
78623
E
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C
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12-26 t
92
PNEUMATIC SYSTEM - BRAKES
Base - February 2003
Braking gaskets replacement
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