Iveco Daily. Manual — part 335
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
D
AILY
Revi - February 2005
HYDRO-PNEUMATIC SYSTEM - BRAKES
51/30
D
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.
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.
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
52
HYDRO-PNEUMATIC SYSTEM - BRAKES
D
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
53
D
AILY
Base - May 2004
BRAKE REPAIRS
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст