Iveco Daily. Manual — part 328
Figure 42
526716
Electro-hydraulic
modulator/control unit for 29L - 35S
vehicles
52392
ABS8/ESP8 systems
Figure 43
ABS 5.3 systems
The electronic control unit has the task of controlling the
electro-hydraulic modulator solenoid valves according to the
signals from the wheel speed sensors.
The electro-hydraulic modulator modulates the pressure of
the brake fluid in both front and rear circuits according to the
control signals from the control unit.
The devices comprising the control unit and
electro-hydraulic modulator of the various models
are not interchangeable.
NOTE
The parts inside the hydraulic unit are not
compatible with mineral oil and unsuitable fluids.
In case of contamination by such fluids, the unit
shall be replaced and properly disposed of.
1. Hydraulic accumulator - 2. Electro-hydraulic modulator - 3. Electronic control unit - A. ABS8 connector -
B. ESP8 connector - F/MC1. Front axle power supply - R/MC2. Rear axle power supply - LF (or FL for ABS8/ESP8 systems).
Left front axle output - RR. Right rear axle output - RF (or FR for ABS8/ESP8 systems). Right front axle output - LR (or RL
for ABS8/ESP8 systems) . Left rear axle output
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Figure 44
526716
Electro-hydraulic
modulator/control unit for 35C -
65C vehicles
52392
ABS8 systems (vehicles 35C - 65C) / ESP8 (vehicles 35C only)
Figure 45
ABS 5.3 systems
The electronic control unit has the task of controlling the
electro-hydraulic modulator solenoid valves according to the
signals from the wheel speed sensors.
The electro-hydraulic modulator modulates the pressure of
the brake fluid in both front and rear circuits according to the
control signals from the control unit.
The devices comprising the control unit and
electro-hydraulic modulator of the various models
are not interchangeable.
NOTE
The parts inside the hydraulic unit are not
compatible with mineral oil and unsuitable fluids.
In case of contamination by such fluids, the unit
shall be replaced and properly disposed of.
1. Hydraulic accumulator - 2. Electro-hydraulic modulator - 3. Electronic control unit - A. ABS8 connector -
B. ESP8 connector - F/MC1. Front axle power supply - R/MC2. Rear axle power supply - LF (or FL for ABS8/ESP8 systems).
Left front axle output - RR. Right rear axle output - RF (or FR for ABS8/ESP8 systems). Right front axle output - LR (or RL
for ABS8/ESP8 systems) . Left rear axle output
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The next pages illustrate the connections of ABS 8/ESP 8 modulators and all their internal components in case of intervention
of the functions integrated into the braking system.
As far as ABS 8 systems are concerned, the functions described are as follows:
- ABS, pressure increase
- ABS, pressure decrease
- ABS, pressure maintenance
- EBD, electronic braking corrector
As far as ESP8 systems are concerned, the functions described are as follows:
- ABS, pressure increase
- ABS, pressure decrease
- ABS, pressure maintenance
- EBD, electronic braking corrector
- ESP, electronic stability program
- MSR, engine braking torque control
- ASR, acceleration traction control device
- HHC, start assist on slopes
- HBA, emergency braking hydraulic assist
DIAGRAM COLOUR LEGEND
Black
- high-pressure circuit
Dark grey - intermediate-pressure circuit
Light grey - low-pressure circuit
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Pressure increase
1. Vacuum servobrake - 2. Scavenge pump control motor - 3. Scavenge pumps - 4. Low pressure accumulators -
5. Power supply solenoid valves - 6. Quick pressure decrease single-acting valves - 7. Discharge solenoid valves -
8. Electronic control unit - 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
By pressing down the brake pedal, the oil under pressure can reach the brake calipers since power supply solenoid valves “5”
are open.
Figure 46
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Hydraulic diagrams of ABS 8 modulator — 4-channel (X)
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