Page 287 of 363
B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
yes
WANDERINGFault chart 6
Remove the 10A ABS fuse in the passenger
compartment connection unit and carry out
a road test with ABS non-operational.
Does the fault persist under these
conditions?
Only consult this section after a complete check with the XR25 kit.NOTES
Normal behaviour linked to system
operation in the regulation phase
essentially because of asymmetrical grip or
poor road surface.
Handling fault not linked to ABS system.
Check the condition and conformity of
brake linings, check tyre pressures, front
axle assembly, ...
no
38-26
Page 288 of 363
B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
UNEXPECTED ABS OPERATION AT LOW SPEEDS AND
WHEN LITTLE PRESSURE APPLIED TO BRAKE PEDALFault chart 7
It is possible to feel brake pedal vibrations which are linked to reactions of the system in particular
situations :
- Crossing speed bumps.
- Rear inside wheel lifts on tight bends.
If the problem is different, check the speed sensors connectors ( micro-breaks) as well as the air gaps.
Only consult this section after a complete check with the XR25 kit.NOTES
38-27
Page 291 of 363
B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
BRAKE PEDAL TRAVEL EXTENDED FOLLOWING A
REGULATION PHASE
(WITH IRREGULAR PEDAL AT START OF REGULATION)
Fault chart 10
Passage of air from the hydraulic assembly regulation channels to brake circuits.
Bleed the circuits according to the procedure recommended in the Technical Note (use of XR25 command
modes. These command modes are described in the section "Aid").
After the operation, carry out a road test with ABS regulation.
Only consult this section after a complete check with the XR25 kit.NOTES
If the fault persists, carry out the preceding operation once or twice more.
If customer complaint is particularly serious and bleeding brings about no improvement, replace the
hydraulic assembly.
38-30
Page 292 of 363
B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
SPONGY PEDALFault chart 11
Presence of air in the brake circuits.
Bleed the circuits in the conventional way starting with the rear right, then rear left , front left then front
right.
Repeat the operation if necessary.
Only consult this section after a complete check with the XR25 kit.NOTES
38-31
Page 293 of 363
B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
BRAKE PEDAL VIBRATIONFault chart 12
Normal reaction of the brake pedal during an ABS regulation phase.
Only consult this section after a complete check with the XR25 kit.NOTES
38-32
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