Wet Brakes

steelo

Do all disc brakes squeal when they get wet?

My avid juicy 3's were going ballistic (technical term for squealing like a little piggy) on my last ride in the rain. Is this common or is it a sign of misaligned calipers and discs?

nicklouse

some do some dont.

Scubar

Not had a problem with my Juicy 3s squeeking, My LX ones do though.

Down the Road

Get them hot that will help. Cold brakes tend to squeal more than hot ones.

Will Snow

have they been bedded in properly??? If not, then, they will squeal like miss piggy...

steelo

I've had the bike (and brakes) about 3 months. Ridden it at least weekly if not more often. I would consider the brake pads to be nicely bedded in by now. Riding in the wet last week they were really squealing thats all. Some of the other guys in the group were suffering with brake squeal too but I was just wondering if it was a common thing or not?

nicklouse

Will Snow wrote:

have they been bedded in properly??? If not, then, they will squeal like miss piggy...

not true.

Will Snow

nicklouse wrote:

Will Snow wrote:

have they been bedded in properly??? If not, then, they will squeal like miss piggy...

not true.

If you want full power and less noise from discs, they need to be bedded in properly, simple as. When you say theve been bedded in, have you just been riding them??? I find the best way to bed them in is to heat them up, ie roll down a hill with them slightly on, then pour water on them. This transfers some brake pad onto the disc, giving quieter, better braking results. Probably a bit late now, though.

supersonic

Squealing is usually caused by the caliper, bolts, rotor, mounts or pads resonating - sometimes its hard to pinpoint it, and the same brake on a new frame may cure it. It can be random between brakes, and so many variables set up to set up. Some brakes squeal more once bedded in, get cured in the wet, or vice versa. Sometimes there is not you can do, just one of those things as nick says. Touch of copaslip on the back of pads can help, as can checking all bolts or even changing them.

Will Snow

copperslip is a bit of a grey area, can do more damage than good. However, the tightening and loctiting of all the bits (specially rotors) can do wonders. But am gona stick with my bedding in bit as well!!!

jayson

In the wet my mono mini's squeal like a pig being chased by bernard matthews and nothin i do will stop it. In the dry they're quiet as a whisper.

pittpony

I'm having all kinds of problems with my Juicy 3s. They're worse in the wet but even in the dry / damp they're driving me nutty. They've got about 350 miles on them so should be bedded in by now! I've taken the bike to 2 shops that had no idea what else i could try. One of them descibed the sound as 'horrendous', which i think was being kind!

I might try some copaslip. Can i get it from a hardware store like B&Q or Wilkinsons?

Also - when you talk about loctiting is that literally just putting some superglue on the bolt thread to keep it in place when tightened?

Cheers!!

nicklouse

loctite is not superglue.

superglue is just on of their products.

they mean thread lock.

nicklouse

Will Snow wrote:

nicklouse wrote:

Will Snow wrote:

have they been bedded in properly??? If not, then, they will squeal like miss piggy...

not true.

If you want full power and less noise from discs, they need to be bedded in properly, simple as. When you say theve been bedded in, have you just been riding them??? I find the best way to bed them in is to heat them up, ie roll down a hill with them slightly on, then pour water on them. This transfers some brake pad onto the disc, giving quieter, better braking results. Probably a bit late now, though.

again not true.

a correctly beddeding and alinged brake can be silent and then all of a sudden start making noises.

i have been through with some OE engineers some problem with a brake.
everything was changed and still the noise was there. and when i say every thing i mean it. firts pads. then disc, then caliper and pads and disc. and then for good measure the hub bearings. and the noise was still there.

mean while the other brake remained silent.

brakes from the same producers one the same frame were silent as were other makes of brake.

oh and a final point it is now quiet.

correct alignment is the single most important thing for quite brakes but is not the be all. Neither is bedding in.

good preperation helps but sometimes it just is not enough.

one reason i am changing brakes.

pittpony

Oops :oops:

Thanks for the clarification. Thought it seemed a bit permanent!!!

nicklouse

243 bottle or 248 in a tube iirc.

clarkson

i used superglue on my rotor bolts. works fine, because the bond breaks with shearing forces, i.e when unscrewing it.

pittpony

Hi guys,

Still no joy on these brakes which leads me to ask... As they've always been noisy since i bought them, should it be up to me or to the shop to sort them out? I took the bike in for its 6(ish) week service this week and asked them to sort it out for me but its still just as bad as ever. I took it out htis mornign and nearly deafened myself

My friend suggested its because i have a carbon frame but i can't believe that's the case with all carbon bikes...

red eye

pittpony wrote:

I'm having all kinds of problems with my Juicy 3s. They're worse in the wet but even in the dry / damp they're driving me nutty. They've got about 350 miles on them so should be bedded in by now! I've taken the bike to 2 shops that had no idea what else i could try. One of them descibed the sound as 'horrendous', which i think was being kind!

I might try some copaslip. Can i get it from a hardware store like B&Q or Wilkinsons?

Also - when you talk about loctiting is that literally just putting some superglue on the bolt thread to keep it in place when tightened?

Cheers!!

get it from any auto shop. put a light smear on dont coat it as with all grease it attracts dust which makes a mess.

what i do is with cars that come in with sqeealy brakes is make an anti squeeal shim up from thin sheet metal, its not just the bolts that resonate the pads do aswell

wwjjtt

well the first thing i'd do is check the caliper alignment, if it's straight and it still squeels, check there is no oil in the pad. then make sure the bolds are tight and if that doesn't work, try some new pads, if that doesn't work, loose all hope in avid pads and get some decent breaks! no i'm not starting that arguement.... if all that doesn't work then it's lbs time!

clubsport911

My Hope 4 pots / Shimano disc, used to squeal like a pig - despite perfect set up and all the fettling I could muster (I'm deeply involved in Aerospace hydraulic system design so these braking systems are just so simple compared to what we have @ work)

Most of the noises are about setting up sympathetic resonances in the mechanical system and a number of very tiny factors can disrupt the resonance. I used a copper grease applied to the back of the pads and this cured all noise - permanently.