Iveco Daily. Manual

102292

HHC device intervention

1. Vacuum servobrake - 2. Yaw sensor - 3. Steering angle sensor - 4. Longitudinal acceleration sensor -

5. EDC motor control unit - 6. ESP electronic control unit - 7. Intake solenoid valves - 8. Driving solenoid valves -

9. Scavenge pump control motor - 10. Scavenge pumps - 11. Single-acting safety valves - 12. Low pressure

accumulators - 13. Quick pressure decrease single-acting valves - 14. Power supply solenoid valves -

15. Discharge solenoid valves - 16. Pressure sensor - 17. Single-acting valves - DX/A. Front axle right wheel sensor -

SX/A. Front axle left wheel sensor - DX/P. Rear axle right wheel sensor - SX/P. Rear axle left wheel sensor

If longitudinal acceleration sensor “4” finds that the vehicle is on a slope, if the brake pedal is pressed down, and if either the first gear
or the reverse gear is engaged, the control unit will power both intake solenoid valves “7” and driving solenoid valves “8”.
At the same time, the pressure to be conveyed to the brake calipers affected can be generated by powering motor “9” which drives
pumps “10”.
This function will automatically keep the vehicle braked over 2.5 seconds until the clutch is closed and the driver presses the accelerator
pedal again, thus avoiding uncontrolled motion of the vehicle.
It allows the driver to easily and safely start the vehicle on all slopes, regardless of the load carried.

Figura 46/25

51/29

HYDRO-PNEUMATIC SYSTEM - BRAKES

AILY

Revi - February 2005

HYDRO-PNEUMATIC SYSTEM - BRAKES

51/30

AILY

526713

Rev sensor

566712

Phonic wheels

35383

The system for measuring the speed of rotation of the wheels
is composed of the wheel speed sensor and the phonic wheel.
The phonic wheel is housed or incorporated in the brake disc
of the wheel and turns at the same speed as the wheel. By
induction in the sensors it generates alternating voltages whose
frequency is in proportion to the speed of rotation of the
respective wheel. These voltage signals are transmitted to the
control unit for processing.

Figure 46/26

ESP SYSTEM SENSORS
Yaw sensor with built-in side acceleration
sensor

It measures the motion of the vehicle around its own vertical
axis (yaw) as well as the vehicle’s side acceleration.

These signals continuously inform the control unit about the
vehicle’s behaviour.

The comparison between these signals and those from the
driver (steering-wheel position, wheel spin number/speed
and pressure on the brake pedal/accelerator position) allows
the ESP control unit to define the actions to be taken. The
hydraulic unit controls brake pressure as quickly as possible,
separately for every single wheel.

Moreover, the ESP system may decrease the engine revs
number by means of the engine control feature.

102115

Longitudinal acceleration sensor

102116

It measures the vehicle’s acceleration and deceleration
changes.

These signals continuously inform the control unit about the
vehicle’s behaviour.

Moreover, the ESP system may decrease the engine revs
number by means of the engine control feature.

Steering angle sensor

102117

It measures the steering angle required by the driver.

The comparison between this signal and those from all the
other sensors allows the ESP control unit to define the
actions to be taken. The hydraulic unit controls brake
pressure as quickly as possible, separately for every single
wheel.

Moreover, the ESP system may decrease the engine revs
number by means of the engine control feature.

Figure 46/27

Figure 46/28

Figure 46/29

Revi - February 2005

HYDRO-PNEUMATIC SYSTEM - BRAKES

AILY

Base - May 2004

Remove the protective rubber plug (1).

Set the vehicle on level ground and lock the rear wheels. Loosen
the nuts (1) securing the front wheels. Lift the front of the
vehicle with a hydraulic lift and rest it on two stands (3).
Unscrew the nuts (1), take off the cover (2) and remove the
wheel.

Front brakes

The following operations have been carried out on vehicles
with 2x44 Brembo front calipers.
They should be considered similar also for 2x42 - 2x52
Brembo front calipers unless stated otherwise.

455026

Figure 47

527417

Replacing brake linings

For 2x42 calipers

Figure 48

52272

45845

Figure 49

Figure 50

Remove the brake linings (1).

Disconnect the wear sensor connection (2). Loosen the
screw (1). Remove the bushing (4) by using a screwdriver as
a lever. Remove the calliper body (3) from the support by
making it turn on the other bushing to extract the brake pads.

Figure 51

79524

The braking system effects safety. All repairs and
servicing operations must be exclusively carried out
by skilled, qualified personnel.

The oil inlet hose to the calliper must not be
disconnected during the operations that follow.

Retracting the pistons will increase the level of brake
fluid in the reservoir. For this reason, check the fluid
does not spill out of the reservoir and damage
vehicle paintwork during the operation.

79253

Use a retractor or other suitable device (2) to retract the
pistons (1).

HYDRO-PNEUMATIC SYSTEM - BRAKES

AILY

Base - May 2004

BRAKE REPAIRS

Content .. 333 334 335 336 ..

Iveco Daily. Manual - part 335