Iveco Daily. Manual — part 329
Pressure decrease
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
If the sensors find that the wheel(s) tends to get locked, they will inform the control unit: the latter will reduce the braking power
by actuating power supply solenoid valves “5” and discharge solenoid valves “7”.
At the same time, the excess oil in low pressure accumulators can be recovered by powering motor “2” which drives pumps “3”.
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Figura 46/1
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HYDRO-PNEUMATIC SYSTEM - BRAKES
D
AILY
Revi - February 2005
Figura 46/2
Pressure maintenance
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
When the optimum braking force has been obtained, the control unit will be able to keep such force steady by de-energizing
discharge solenoid valves “7”, motor “2” and its respective scavenge pumps “3”, whereas power supply solenoid valves “5” will
be powered on.
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HYDRO-PNEUMATIC SYSTEM - BRAKES
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AILY
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EBD Device intervention
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
Fp. Rear axle braking force - Fa. Front axle braking force - A. Servobrake distribution curve -
B. Ideal distribution curve - C. Distribution curve of corrector (if any) - D. EBD system distribution curve
If the sensors find that one or both of the rear wheels tend to get locked compared with the front wheels, they will inform the
control unit: the latter will, as a result, power rear axle power supply solenoid valve “5”, so as to optimize the braking force. Any
anomaly of some components of the system will cause the ABS system to be cut off (this condition will be displayed by the lighting
of the respective warning light). Yet, the EBD system operation will be ensured. Simultaneous lighting of both failure warning lights
(ABS and EBD) will indicate a fault in the EBD system; under these conditions, great care shall therefore be taken while driving,
since braking will not be optimized.
Figura 46/3
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HYDRO-PNEUMATIC SYSTEM - BRAKES
D
AILY
Revi - February 2005
Pressure increase
1. Vacuum servobrake - 2. Electronic control unit - 3. Scavenge pumps - 4. Scavenge pump control motor -
5. Low pressure accumulators - 6. Power supply solenoid valves - 7. Quick pressure decrease single-acting valves -
8. Discharge solenoid 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
By pressing down the brake pedal, the oil under pressure can reach the brake calipers since power supply solenoid valves “6”
are open.
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Figura 46/4
HYDRO-PNEUMATIC SYSTEM - BRAKES
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D
AILY
Hydraulic diagrams of ABS 8 modulator — 3-channel (II)
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