Musical Car

[robwright]

Mine has developed a rather strange issue. After I have been driving for around 10-15 minutes I start getting a low pitched whistle coming from what sounds like the rear right wheel area. I stress it only manifests after 10-15 mins and even then not always. It's almost like the noise when you blow across the top of a bottle. At first I thought it might be a bush or other worn suspension component but now I am not sure. It goes away when you apply the brake and returns a little bit louder as soon as the pedal is released for a short time. I am thinking maybe a sticking piston on the caliper or something. Anyone ever had anything similar?

 

[deafasapost]

i have exactly the same problem on my citroen c4!!

it seems as if something is rubbing as it gets warm, ie metal expanding with heat i think its either:-

the pads rubbing on the disc or
the discs slightly warped.

although if the discs are warped, then i would feel it under braking and i dont. so my theory is the pads rubbing so a sticking piston on the caliper.

 

[Hairyarse]

Any chance it's the wheel bearing once it gets hot?

 

[deafasapost]

i dont think so andy as even with the slightest braking pressure it stops whistling.

 

[robwright]

Yep exactly even slight pressure and it stops. My money is on a sticking piston. I was planning on swapping the discs around to give the handbrake a little more bind so if it transfers I will know it is the disc. However I also feel nothing under braking so I reckon it is one or more of the four pistons sticking on that caliper.

 

[deafasapost]

i rek on mine it is a sticking piston. i did have exactly the same symptoms on the off side rear last year first, but after a while it stopped on it own accord. i wonder if a build up of brake dust contributes to it?

 

[Eldavo]

Am maybe being thick here but how would swapping the discs improve the handbrake? Genuine question.

(p.s. Not forgotten about ABS pump part number, just not had chance yet.)

 

[robwright]

They can wear a pattern into the hub inside the disc. Sometimes it can help to reverse the flow if you know what I mean. Going against the grain can give a little more bite.

 

[robwright]

Could it also be a bit of "plate lift" causing the pad to stay in touch with the disc?

 

[robwright]

Hmm could well be. In any case I think it is definitely brake related. Mite be time for a spot of caliber refurb on the back at least. Anyone know of any reasonably priced kits? Or indeed what is needed? I may even be able to cobble the parts together at work.