Iveco EuroCargo (12 to 26 t). Manual — part 171

Figure 28

84418

1. Single-cylinder 225 cm

3

(359 cm

3

optional) compressor - 2. 0.261 silencer - 3. Air Processing Unit - 4. 20L + 20L axle air

tank - 5. Manual condensate exhaust valve - 6. 20L front axle air tank - 7. Engine brake control button - 8. Safety valve

(optional) - 9. Brake valve control cylinder - 10. Engine brake control solenoid valve - 11. Axle ABS solenoid valve - 12. Phonic

wheel - 13. Quick-release valve - 14. Rear axle speed sensor - 15. Rear axle membrane brake cylinder - 16. Rear axle drum

brake - 17. Rear axle combined brake cylinder - 18. Parking relay valve - 19. Inserted parking brake signalling low pressure

switch 6.5 bar - 20. Manual parking control distributor - 21. Manual safety distributor (optional) - 22. Self-limited coaxial duplex

distributor 7.6

± 0.3 bar - 23. Quick-release valve - 24. Front axle ABS solenoid valve - 25. Front axle disc brake (diam. 430

mm or 436 mm) - 26. Front axle brake calliper - 27. Front axle membrane cylinder - 28. Front axle speed sensor - 29. Front

axle phonic wheel - 30. ABS Electronic unit - 31. Parking brake luminous signaller - 32. STOP lights -

33. Front axle / rear axle manometer - 34. Stop light relay control switch - 35. EDC inserted brake signalling switch -

36. Relay valveBraking control - 37. Pneumatic control plug.

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PNEUMATIC SYSTEM - BRAKES

Base - February 2003

1. Phonic wheel - 2. Check valve - 3. Engine brake solenoid valve - 4. A.P.U. - 5. Relay valve - 6. Phonic wheel -

7. Wheels revolution sensors - 8. Combined brake cylinder - 9. Triple-control servodistributor - 10. Coupling heads -

11. Parking - trailer braking tank - 12. Hydraulic pressure control plug - 13. Wheels revolutions sensor - 14. Phonic wheel -

15. Rear disc brake assembly - 16. Quick discharge valve - 17. Pressure relief valve - 18. Electro-pneumatic valve -

19. Air tanks - 20. Pressure control plug - 21. Pressure relief valve - 22. Front disc brake assembly - 23. Membrane brake

cylinder - 24. Wheels revolutions sensor - 25. Phonic wheel - 26. Engine brake operating cylinder - 27. Engine brake

control button - 28. Duplex distributor - 29. ABS elecronic unit - 30. Single-cylinder compressor - 31. Parking brake

distributor - 32. Trailer slowing-down control distributor (optional) - 33. Wheels revolutions sensor.

Figure 29

78952

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PNEUMATIC SYSTEM - BRAKES

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Base - February 2003

Service braking

With pedal, of the electrically-controlled pneumatic type,
operating on all wheels and on trailer or semitrailer.
It is composed of two independent sections, one for activating
front axle braking elements, the other section for activating
rear axle braking elements.
A third section, interlocked with the two distributor sections,
is provided for braking the trailer. The duplex distributor with
electric transmitter checks the two independent sections and
the trailer control servodistributor in turn checks the above
interlocked section. The pneumatic system sectioning enables,
in case of failure of a section, the efficiency of the other ones.

Safety braking

The safety braking allows reducing vehicle running speed and
stop it in a safety space, also when a braking system failure
occurs.
It must be meant as partial service braking that, due to the
double circuit, anyway operates on one of the two axles.

Engine brake

The ”engine brake” system, being of the electric type, is
managed by the EDC unit. The exhaust brake can be
controlled in different ways, which can be selected by means
of the special switch available on the dashboard or the pedal
on the floor to be used with the different types/conditions of
the road.
Actuation can be controlled directly through the pedal
available on the floor.
When the selector is set to position 1, the exhaust brake is
linked to the accelerator pedal and is operated when the
accelerator is released.
When the selector is set to position 2, engine brake/service
brake are coupled, with operation starting from first pedal
stroke length and keeping the position.
Every time the engine brake is inserted, the signalling panel
warning light turns on.
The insertion of engine brake together with accelerator pedal
disables all adjustment operations connected to Cruise
Control.

Operation

Independently from the type of selection being set, the EDC
electronic unit drives, through connector B pin 11, the engine
brake solenoid valve.
This one, by switching its state from N.C. to N.O., allows the
engine oil to flow to operating cylinder which, in turn,
operating on the engine exhaust throttle valve, allows braking
it.

Parking braking

It is composed of the pneumatic control of the manual
distributor, of a spring cylinder that operates on rear wheel
brakes by locking them.
This system, in case the supply is lacking, automatically brakes
the vehicle.

Front brakes

Front brakes are of the disc type. Discs are keyed on wheel
hubs and equipped with venting fins that allow lowering the
high temperature that develops under the braking action.
Braking gaskets are equipped with a wear signaller connected
to a warning light placed on the dashboard, which signals
gasket wear.
ABS device phonic wheels are keyed-in on wheel hubs.

Front axle 5845

- type: WABCO (PERROT) PAN 17 - Ø 330x34

Front axle 5842/5 - 5851/5

- type: KNORR SB6 - Ø 377x45

Front axle 5871/5

- type: KNORR SN7 - Ø 432x45

Rear brakes

Rear brakes are:

- disc type on rear axle MS08-125, MS13-144,

MS13-164 MS13-165

- Drum brakes on tandem axle SP 145 E

In drum brakes, every braking assembly is composed of a body
in which adjustment, control pins and wedge units are housed.
Wedge units are actuated by cylinder stem in turn actuated
by compressed air.
Wedge unit rollers along their stroke generate control pin
expansion that, winning jaws return spring resistance,
approach jaws to drum dampening the brakings. Adjustment
and control pins are made integral with the brake body by two
pins that are inserted in a side milling. When the braking action
ceases, air pressure is lacking in the combined brake cylinder
membrane section, and consequently the jaws return spring
and wedge unit return spring actions take care of returning the
wedge units into their starting position.
Braking gaskets are equipped with a wear signaller.
ABD device phonic wheels are an integral part of brake disc
on H127E rear axle, while are keyed-in on wheel hubs in the
other rear axles with drum brake.

Rear axle MS08-125

- type: WABCO (PERROT) PAN 17 -

∅ 330x34

Rear axle MS10-144; MS10-164

- type: KNORR SN6 -

∅ 377x45

Rear axle MS13-165

- type: KNORR SN7 -

∅ 432x45

Rear axle SP145E

- type: Duoduplex -

∅ 381x178

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PNEUMATIC SYSTEM - BRAKES

Base - February 2003

BRAKES