clio 172 brake problems!! please help asap.

[chawnz]

hi i have a 2002 clio 172. it has only covered 60k miles.

when driving if i accelerate quite quick and apply the brakes the pedal goes rock hard? then as the revs go down the brake comes to life?

abs light and serv light occasionally come on too.

it only does this problem occasionally.

i have had diagnostics and it showed 6.target wheel .one of 4? ?

i have checked all abs rings and they are fine.

please help experts.


anyone else had same problem??

could it be abs pump?

vacuum looks fine.

could it be servo?

regards

[jon_r]

Hello chawnz, welcome aboard. Enjoy your visits.

[chawnz]

thanks. please can you help me on this problem i have?

[Dan@519Automotive]

That ABS light coming on is a bit of a clue IMO, look for broken ABS rings

[Perry]

No idea tbf, but you'd be better off posting it in here: http://www.cliosport.net/forum/forum...eels-amp-Tyres and doing a search to see if anyone else has posted similar.

People might also be a bit slow to reply today as it's the French Car Show and many will be at it, so give it a bit of time.

[chawnz]

That ABS light coming on is a bit of a clue IMO, look for broken ABS rings

thanks. i have looked for broken abs rings. they are all fine. i cleaned them all yesterday. and to be honest they dont seem to be going rock hard again as much as previous. ?? can i rule out abs pump??

[chawnz]

No idea tbf, but you'd be better off posting it in here: http://www.cliosport.net/forum/forum...eels-amp-Tyres and doing a search to see if anyone else has posted similar.

People might also be a bit slow to reply today as it's the French Car Show and many will be at it, so give it a bit of time.

ok thanks mate

[barnesautos]

I'd be checking the servo valve as you said pedal goes hard , but as you have ABS warning does indicate an electrical fault.
Does it only do it for one time only or does it do it pretty much every time you try it. ?

[chawnz]

I'd be checking the servo valve

ok thanks. i beleive the person i bought it off... had a new return valve put in it??

[chawnz]

I'd be checking the servo valve as you said pedal goes hard , but as you have ABS warning does indicate an electrical fault.
Does it only do it for one time only or does it do it pretty much every time you try it. ?

it only does it occasionally. if i boot it then it tends to happen. driving around normally and its fine?? that fault code was the only one i had come up, 6.target wheel one of 4?? would you change the servo rather than abs pump first? the vaccum looks fine.

[barnesautos]

If a fault code comes up and lamp on dash its deff electrical.
Servo would appear to be ok.

Check for rear wheel bearings for play as this affects the air gap at the target ring, which in turn alters the speed characteristics

[chawnz]

If a fault code comes up and lamp on dash its deff electrical.
Servo would appear to be ok.

Check for rear wheel bearings for play as this affects the air gap at the target ring, which in turn alters the speed characteristics

ok thanks. the rings look like new on the back. do you know what that fault code is? something is defo making the abs kick in when it shouldnt but only when high revving.

[ScrumpyJack]

Hi, I am having the exact same problem and would be very interested in finding out the problem with your car,, mine goes for its MOT next week and i have just fitted new discs and pads all round..


Scrumpy

[chawnz]

Hi, I am having the exact same problem and would be very interested in finding out the problem with your car,, mine goes for its MOT next week and i have just fitted new discs and pads all round..


Scrumpy

hi scrumpy did you find out the problem? did you have the same fault code come up as me? thanks. i ve changed servo and pump and still doin it

[Paul182]

could it not be an ABS sensor?

[chawnz]

could it not be an ABS sensor?

it may well be. but at 45 quid each it was cheaper to change the abs pump and servo . renault diagnostics is crap and they just didnt diagnose potentially what wheel it was. the rings are fine . the fault code ive had is target wheel one of four!!? but renault wouldnt tell me what the definition was??

[Paul182]

could even just be a dirty sensor . so a quick wipe could be all that is needed ? thats free

[chawnz]

could even just be a dirty sensor . so a quick wipe could be all that is needed ? thats free

ive cleaned all sensors and checked all the rings. do you think i might just need the fault codes clearing as i have replaced abs pump and module

[steve!pax]

Hi all,
ive been a silent member for a long time now,but now I need help please I have this exact problem. the problem was not there until I took it to a garage and had work done.
engine work
new rear discs pads,
front passenger abs (wheel speed sensor)
now on the way home from the garage my poor 172 had this same problem as soon as you go over 4000 rpm or so the brake pedal goes rock hard until I press the clutch down? It gave me a bit of a scare to be honest,
the garage isn't being very helpfull so I was going to ask the professionals :-) if you have any idea of they got there's fixed!!
cheers
steve

[Andy93]

I have the exact same after changing rear discs and pads. Someone please help!