2009 RENAULT TWINGO RS brake

38C-69
MR-413-X44-38C000$940_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart38C
ALP 4 Drift
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Disconnect one wheel speed sensor.
Start the engine and ensure that only the ABS
system fault warning light comes on. Do not drive
the vehicle if the brake fault warning light is also lit,
as the "EBD" (brake limiter) function is no longer
ensured.
Carry out a road test with the ABS thus out of order.
Is the customer complaint still present under
these conditions?
NO
Normal behaviour linked to the system operation
during the regulation phase, mainly on surfaces with
uneven grip or which are poorly laid.
YESRoad holding fault not related to the ABS.
Check the condition of the brake linings
and that they are to specification and
check the tyre pressures, the front axle,
etc.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP4

38C-70
MR-413-X44-38C000$940_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart
MK70 ABS
Vdiag No: 04
38C
ALP 5Unexpected ABS operation at low speed and with
slight pedal pressure
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
IMPORTANT: ABS regulation is sensitive on slippery surfaces (ice, wet cobbled
streets, etc.).
Check the conformity of the mechanical components.
Brake pedal vibrations may be felt which are connected to the system behaviour in particular situations:
–Crossing speed bumps.
–Tight cornering with lifting of the inside rear wheel.
These vibrations may be linked simply to "EBD" (brake limiter) activation, when the pressure on the rear axle is
limited.
If the fault relates to something else, check the speed sensor connectors (micro-breaks) as well as the targets.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP5

38C-73
MR-413-X44-38C000$940_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart
MK70 ABS
Vdiag No: 04
38C
ALP 8Lengthening of the brake pedal travel following a regulation phase
(with an irregular pedal when entering the regulation phase)
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components.
Air transit from the hydraulic unit regulation channels to the brake circuits.
Using the following diagnostic tool commands:
AC155: Rear left wheel bleed.
AC154: Front right wheel bleed.
AC156: Rear right wheel bleed.
AC153: Front left wheel bleed.
Carry out a bleed of the secondary circuits starting with the left-hand rear brake then the right-hand front brake,
the right-hand rear brake then the left-hand front brake.
After the operation, carry out a road test with ABS regulation.
If the fault is still present, carry out the above operation again 1 or 2 times.
If the customer complaint is particularly serious, and bleeding the circuit does not improve matters, replace the
hydraulic unit.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP8

38C-74
MR-413-X44-38C000$940_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart
MK70 ABS
Vdiag No: 04
38C
ALP 9 Spongy pedal
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components.
Air in the brake circuits.
Carry out a conventional primary circuit bleed (see MR411, Mechanical systems, 30A, Braking circuit, Bleed).
Repeat the operation if necessary.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP9

38C-75
MR-413-X44-38C000$940_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart
MK70 ABS
Vdiag No: 04
38C
ALP 10 Brake pedal vibration
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components and in particular check
that the brake discs are not warped.
Normal reaction of the brake pedal during ABS regulation or of limitation of pressure on the rear axle
("EBD" brake limiter function).
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP10

38C-76
MR-413-X44-38C000$940_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart
MK70 ABS
Vdiag No: 04
38C
ALP 11 Noises from the pump, the pipes or the hydraulic unit
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components.
–Vibration of the unit: Check that the unit support insulating rubber mounting bushes are in place and in good
condition.
–Vibration of pipes: check that all pipes are correctly supported in their mounting clips and that there is no
contact between pipes or between pipes and bodywork.
The Front left-hand wheel solenoid valves, Front right-hand wheel solenoid valves, Rear left-hand wheel solenoid
valves and Rear right-hand wheel solenoid valves actuating commands may be used while depressing the brake
pedal to determine where the noise is coming from.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP11