Squealing brakes : Not Again!

[olivier renault]

Heyup chaps,

There's something wrong with my bike brakes, I can't get rid of the squealing. I've been to a couple of bike shops, but they've been mostly useless. Just spray some weird crap on them and call it a job done.

This usually happens when I leave my bike alone for a while. No brake bite, loud squeal, then I have to pour a bit of water on the calipers, and they work fine. That usually lasts 10, 15 mins before they start slipping and squealing again. It's a Specialised, with some basic Shimano discs.

1) I've clean them up good a few times. Basic hot water+soap clean, a good rinse, then using break cleaner to scrub the pads and discs.
2) I've 'bedded' the brakes. They bite fine when they have a bit of water on them.
3) I haven't noticed any oil leak, and I have good brake pressure.

Am I destined to keep a bottle of water at all times to keep those damn brakes working? Is this something to do with the environment (city polution)?

 

[olivier renault]

What brakes are they?

Assume hydraulic? Changed pads? Personally wouldn't care about the squealing all that much as long as they work.

Yeah, hydraulic, resin pads, steel disk. I've changed the pads, tey are brand new. I've cleaned the old ones, same issue. I've try the sanding as well.

I think they are contaminated. When left alone for too long, the brakes get very, very slippery (until I do the water squirt maneuver). Must be hydraulic fluid seeping through, even though I'm not loosing brake pressure Back to the shop (still under warranty), and no BS this time.