fore0121

Hi all,

Just replaced the pads on my brakes and I'm getting a weird noise on the back set. I'm using the Cervelo calipers with DA pads. Didn't have a problem with the old set, but whenever I pull the rear brake I'm getting a squealing noise with a vibration in the rim. Front one, no issue though. It's annoying as he77.

It has been suggested to clean the rim, but any special way to clean the rim surface? other than the dish soap and water I usually use? or any other ideas of how to adjust?

Thanks
f

velorapide

Did you "toe" them in?

That usually solves noisy brake pads/vibrations.

deanp

Double check them, many are marked left, right, forward and back. Make sure they are mounted correctly.

fore0121

Sorry, 'Toed In"?

I did check their alignment, they sit square on the centre of the rim. I did not check for "Left/Right", but will.

f

deanp

Most pads have a chamfer or taper so that the trailing edge touches first, and "pulls" the leading edge into contact with the rim. It makes them more quiet. It helps to elimate chatter from the leading edge if it touches first.

jamlo21

I had the same problem you did, but the squealing noise went away after a VERY fast descent. I figured it was just the sound of the pads being broken in.

velorapide

Thanks... you beat me to it.

stapfam

Trailing and leading edge nearly caused me to post an incorrect posting on terminology. You want it so that the edge of the pad nearest the front of the bike is the edge that bites first. This will not always eliminate squeal and I have noticed that shimano blocks are very noisy- but are my preferrd block material. There are plenty of other manufacturers out there so if you still have squeal after setting them up properly- try a different manufacturer. If they still squeal- try riding through a few puddles. That normally quietens them down and will help to bed the blocks in quicker.

simplyred

I got squeaking noises off my WH-550's after I cleaned the rim with soap/water. After a couple of hard braking sessions - it went back to normal....

-simplyred

operator

You can lightly sand the top of the pads if they look glazed over. They shouldn't even be on new pads, however. If the sound presists, swap them out ASAP or you will need new rims very soon.

xcmcvey

I was having the exact same problem this morning with a new caliper i put on, and toeing them in so the front of the pad hits first works charms.

fore0121

stapfam: I've used the DA pads before, they were the ones worn out. No issues before.

operator: Why would I need a new rim if I don't swap them out?

simplyred: I'm trying the cleaning.

All: thanks for the responses.

f

Alphonso

I had the same problem. Replaced the DA pads with Koolstop. I'll never use anything but Koolstop again.

velorapide

Exact opposite for me. Had noisy Koolstops... swithced to DA.... now no noise.

Ostuni

cleaning tip read/heard somewhere (probably here) that works well for me:

get plain (untreated) green scotchbrite pads at the supermarket. i cut them into strips roughly the width of the braking surface and the pads...

i spritz the scotchbrite pads with windex, and clean the braking surface, and do the same on the pads. not rubbing real hard or anything, but enough to remove ground in grit, etc.

Az B

My pads were making noise until I flew down a hill at about 50mph and jammed the brakes on really hard. Now they don't make any noise at all!

Az