Rear Disc brake squeal

tomb57

Hi chaps got a giant fathom 1 2017 with shimano brakes got a bad squeal
If it were a car I’d take off disc clean and check surface then re face the pads if
Enough meat on them done this used a brake cleaner used on cars
Still have a tremendous squeal any thoughts would be gratfuiiy accepted

Thanks Tom b

veronese68

Bike brakes don't like car brake cleaner as it leaves an oily residue. Clean the discs again using IPA, isopropyl alcohol not beer. But your pads are probably toast.

tomb57

Thanks Veronese I’m abut in the back of beyond where would I likely be
Able to purchase some IPA from (I have some hobgoblin IPA in me
Beer box but would rather drink it )
Thanks for your help
Tom b

veronese68

Enjoy the hobgoblin.
The less entertaining IPA is also known as rubbing alcohol. I've got a feeling you might be able to buy it in a chemist's. I bought some in Maplin when they were still going. Some sort of electrical switch cleaner might do it. You need something that doesn't leave any residue at all.

lesfirth

tomb57 said:

Hi chaps got a giant fathom 1 2017 with shimano brakes got a bad squeal
If it were a car I’d take off disc clean and check surface then re face the pads if
Enough meat on them done this used a brake cleaner used on cars
Still have a tremendous squeal any thoughts would be gratfuiiy accepted

Thanks Tom b

Do the same as a car but rub disc surface with some wet or dry. Then plenty of hard braking to bed in the pads.

lesfirth

veronese68 said:

Bike brakes don't like car brake cleaner as it leaves an oily residue. Clean the discs again using IPA, isopropyl alcohol not beer. But your pads are probably toast.

Let us all know what brand of brake cleaner you have been using. We can make sure we avoid it. I have not had that problem with any I have used.

tomb57

Thanks Les will let you know what brand later as I’m busy today
Not able to get to shed
Will try a near hardware shop for some
IPA or similar
Thanks all
Tom b

JBA

Have you made sure the brake caliper is correctly aligned? If the pads aren't hitting the rotor squarely you can get horrible squealing.

I bought a litre of IPA with spray nozzle from Amazon recently for less than a tenner.

tomb57

Got some wd40 electrical contact cleaner recleaned disc had some new
Pads waiting so put those in Caliper looked ok and I know I haven’t
Knocked it road tested quite as a church mouse
Car brake cleaner was Holts which really surprised me as make is normally
Good still I’ve learnt a lot now
Many thanks to all for the help
Tom b