Brakes - Fabia vrs - at wits end

[Captain Benzo]

All,

i throw myself at your mercy.

i've recently started hearing a squealing noise from the front driver's side wheel. I assumed it was sticking carriers ( a usual culprit) and greased them up, still a noise.
new pads and discs on.... still a noise.
bled the brakes in case air in fluid, still a noise.

it's not all the time, only after 10-ish miles of normal driving, only one corner. pressing the pedal makes it stop. using brakes more makes it work. stopping for 5-10 minutes and starting and it will be gone.

the next stage for me is Caliper, Master cylinder, ABS sensor, but this is starting to get expensive.

please could you help?

Ben

[thebirdman]

Check the back plate for clearance between it and the disc. It may be bent close and touching the disc when the brakes are hot.

[oakdale]

Next time you hear the squealing noise, gently apply the hand brake to make sure it's not the rear brakes making the noise.

You can easily be fooled as to where noises are coming from.

[Captain Benzo]

i've had a look and the back plate looks fine,
also handbrake test came up negative.

made it into work (12 miles) without a squeak, but i was trying not to use the brake.
it's like the piston it extending, but not wanting to retract.

any other thoughts?

[Mark_r33]

Sticking piston?

st pads?

Anti squeal clips peppered?

Did you butter the backs of the pads with copper slip or better before fitting?

[Captain Benzo]

everything was greased when doing pads and discs, sliders and carriers were checked.

brembo pads and discs.

going to whip off the wheel tonight and check back plate.

cheers for the info.

[oakdale]

Check the hub nut is tight while you're there, this being slightly loose can cause this sort of noise.

[AdrianR]

Gunk around piston seal making them stick?

Take pads put, then very carefully, with a mate to help, press pedal so that pistons protrude from caliper enough to see rubber seals. Clean thoroughly with proper brake cleaner, then push back in and reassemble. Take care that fluid level in master cylinder doesn't drop below min.

Cross fingers.

[Jimmyarm]

I've had this before on VAG cars and it's turned out to be the wheel bearing on its way out.

They start squeaking intermittently once warmed up and applying the brake stops it. It's quite hard to diagnose as it sounds like brake squeal but using a mechanics stethoscope you should be able to hear a bit of roughness in the bearing when spinning it up from cold.

[one eyed mick]

Had this on a PUEGOET 406 could well be wheel brg immenent failure

[Captain Benzo]

couldn't see anything on back plate, but its booked in for a service / mot tomorrow so hopefully a diagnosis will be made.

will get them to check bearing while its on the ramps.

cheers guys.

[Jimmyarm]

The bearing noise probably won't be enough to fail an MOT or get picked up on a service unless they are specifically looking for it so make sure you ask them to check it with a stethoscope

[Captain Benzo]

have done,

the owner's son has the same car, so we had a good chat at drop off. he will stethoscope it.

[Captain Benzo]

well,

sticking caliper / goosed seals

so stripped, cleaned, new seal kit.

she's working a treat.

thanks all.