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Front brakes not fully releasing



  Clio
Hi

Both front brakes on my Clio 182 do not appear to be fully releasing. If the car is not used for a period then the car will roll freely, however should you use it in stop start traffic say then they pump up and start to drag. This is exhibited by the heavier steering and that both front rims are warm even though I may not have been braking heavily.

The car was parked up for six months last year and it was only on recommissioning it that the fault manifested.

So far the car has now had replacement sliders, pads and front discs. The flexi hoses are braided Goodridge ones probably dating around 7 years old.

As the front brakes are equal in temperature and you can hear them gently rubbing the discs as the problem begins to occur, this to me suggests a fault further up between brake hoses and brake pedal.

I have seen a topic mention the brake bias valve can cause the brakes to bind. Would this be a symptom?

Can this be a fault of the ABS module?

Is it known for the Master Cylinder (or those items mentioned above) to stick after the car has been laid up for six months?

Thanks,
 
  Clio
Hi

I did forget to say that the calipers move freely when I have the car jacked up. I have replaced the sliders as a precautionary measure as well. Both sides move freely. If the car has stood the brakes behave fine but if you use them like in stop start traffic they quickly start to drag.

I had this once on an old Land Rover and the issue was the master cylinder had failed and was not allowing fluid back.

Thanks,
 
  Clio
Hi

Caliper dust seals looked okay and peeling them back to inspect what I could of the pistons didn't indicate any notable corrosion or pitting.
 

Brigsy

ClioSport Club Member
  Kangoo 172cup
If both or all 4 calipers are dragging, and the pistons are free id be looking at the master cylinder. Ive had a faulty master make all 4 calipers stick on after a couple of month layup on my old R5gtt, no idea why i think it was due to age. Clio’s not the newest car now so getting to that age where stuff just breaks at random.
 
  Clio
Hi

Possibly.

I have done some more digging around online and now unsure whether my car has a brake bias valve or if this is only for non-ABS equipped cars. My car is the "full fat" 182 so has ABS. Does this mean my car does not have a brake bias valve as this is a function of the ABS module?

Thanks,
 
  Clio
Hi,

The front brake calipers are now rebuilt with new pistons and seals. Whilst the symptoms have improved they are not resolved.

Anyone able to advise on these symptoms?

Does the ABS pump fulfill the role of brake bias valve?

Can the ABS pump be bled without CLIP should I replace the brake master cylinder myself?

Is there a way I can test or identify whether the ABS pump has a fluid restriction?

Thanks,
 

JamesBryan

ClioSport Club Member
  Titanium 182


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