Iveco Stralis AT/AD. Manual — part 259
Figure 68
Figure 69
This device brakes the driving wheels, via the brake anti-lock
modulator, whenever a tendency for one or more driving
wheels to skid is detected.
The valve is normally closed. When the electronic control unit
detects a tendency to skid of one or more driving wheels, it
sends a signal to the solenoid valve, which energizes and lets
air pass to the brake anti-lock modulators that brake the
wheels. The solenoid valve de-energizes when the wheels
have reached the right degree of friction on the road surface.
35384
526713
Speed sensor
566712
Phonic wheels
35383
The speed sensors and phonic wheels have the job of
detecting the speeds of the respective wheels.
The phonic wheel is housed on the wheel hub and turns at
the same speed as the wheel. It generates alternating voltages
in the sensors by induction. The frequency of these voltages
is in proportion to the speed of rotation of the respective
wheel. These voltage signals are transmitted to the control
unit to be suitably processed. A sensor and a phonic wheel
are fitted for each wheel. This arrangement makes it possible
to control an individual braking pressure for each wheel
during adjustment, optimizing travelling stability and braking
distance.
526724
Electro-pneumatic valve for ASR
526711
Electronic control unit
35384
73925
A = ABS — EBL electronic control unit
B = EBS electronic control unit
Its purpose is to control the brake system, producing
deceleration in relation to the parameters detected by the
various system components.
The electronic control unit is equipped with a highly
advanced self-diagnosis system and it is able to identify and
save any trouble, even of an intermittent nature, occurring to
the system during operation, in relation to the environmental
conditions, ensuring the most correct and reliable repairs.
Compared to the ABS control unit, the EBS control unit is
able to govern auxiliary deceleration systems (exhaust brake
and Retarder), optimizing the action so as to ensure better
system operation and moreover reduce brake lining wear.
Figure 70
Pressure sensor
In ABS/EBL systems, its job is to inform the electronic control
unit of the extent of action required by the driver.
In EBS systems, this component is integrated in the front axle,
rear axle and trailer control valves.
52722
Figure 71
S
TRALIS
AT/AD
94
AIR SYSTEM - BRAKES
Base - January 2003
Figure 72
794911
Diaphragm brake cylinder
(for front and added front axle
disc brake)
794922
Combined brake cylinder
(for front and rear disc brake)
73927
Figure 73
This device transmits the force given by the compressed air,
as the brake pedal is pressed, to the mechanical service
braking device. If there is any trouble, it is necessary to replace
the entire cylinder.
73926
35798
This device transmits the force given by the compressed air,
as the brake pedal is pressed, to the mechanical service
braking device. If there is any trouble, it is necessary to replace
the entire cylinder.
This device is composed of two parts: a diaphragm brake for
service braking and a spring brake for parking and emergency
braking if the braking system fails.
Diaphragm brake cylinder
(for front and added front axle drum brake)
Combined brake cylinder
(for front and rear drum brake)
36744
This device is composed of two parts: a diaphragm brake for
service braking and a spring brake for parking and emergency
braking if the braking system fails.
Figure 74
Figure 75
!
Should the component have to be replaced, follow
the PIC instructions of the relevant vehicle to identify
the actual sizing.
!
Should the component have to be replaced, follow
the PIC instructions of the relevant vehicle to identify
the actual sizing.
AIR SYSTEM - BRAKES
95
S
TRALIS
AT/AD
Figure 76
Combined cylinder emergency brake release
device
Before detaching the combined cylinder from the vehicle,
carry out the manual brake release procedure for the
combined cylinder as described above.
!
Before removal, it is recommended to thoroughly
clean the outer parts of dirt and other debris that on
getting inside could damage the cylinder.
If there is any trouble with the spring section of the
cylinder, do not dismantle it as this can be dangerous.
Figure 77
If it were not possible to supply the spring section of the
combined cylinder (2) pneumatically, it is possible to release
the vehicle brake manually to permit towing. To release the
vehicle brake you need to unscrew the screw (1) fully.
36745
36476
Repairs
S
TRALIS
AT/AD
96
AIR SYSTEM - BRAKES
Base - January 2003
TROUBLE
POSSIBLE CAUSE
REMEDY
Air leaks from the outlet or
retaining clamp
Diaphragm punctured or broken.
Diaphragm lip broken.
Retaining clamp locking screws loose.
Replace the diaphragm
Tighten the screw
Air leaks from the dia-
phragm section supply
Deterioration of the parts forming the spring
section
Overhaul the device, replacing any worn parts.
Figure 78
1. Dry bush - 2. Threaded hose - 3. Piston - 4. Washer - 5. Spring split pin - 6. Pin - 7. Retaining plate - 8. Supporting plate -
9. Guide pin - 10. Guide bush - 11. Sliding pin - 12. Plug - 13. Dragging device - 14. Wear sensor - 15. Rear axle- 16. Chain -
17. Spring- -18. Cover - 19. Adapter - 20. Chain gear - 21. Adjusting device- -22. Cover - 23. Brass bush - 24. Sliding pin -
25. Sliding bush - 26. Inner protection - 27. Ring - 28. Brake lining - 29. Brake disc body - 30. Lever - 31. Cam bearing.
78396
78397
SEC. AA
AIR SYSTEM - BRAKES
97
S
TRALIS
AT/AD
5274
DISC BRAKES KNORR TYPE (CALIPER SN7)
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