New second hand bike. Front brake squeals badly ?!

Hello
I am new to mountain biking
I have a question about my front brake which doesn’t stop squealing.
I have tried all the basic stuff like disc cleaner, sanding the pads etc. Not really doing a lot tbh.
Can anyone advise what It could be.
I have Shimano xt brakes and rt81 discs
Thanks
Jack.
I am new to mountain biking
I have a question about my front brake which doesn’t stop squealing.
I have tried all the basic stuff like disc cleaner, sanding the pads etc. Not really doing a lot tbh.
Can anyone advise what It could be.
I have Shimano xt brakes and rt81 discs
Thanks
Jack.
0
Posts
And it all promised so so much”
Giant Trance 2 27.5 2016 ¦ Bird Zero Mk1 ¦ Giant Revolt Advanced 2 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
The quickest way to fix this is to fit new pads, but assume that oil was the problem and clean the disc as well. Then bed them in properly.
You may have been ultra careful and are convinced that you never got oil anywhere near the pads, but it can come off the road if you ride tarmac at all.
Deviate Guide
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isopropyl alcohol on the disc and a new set of pads usually does the trick.
Never experienced it on a front brake, usually rear brake I’ve had it on.
Check calliper alignment, pads not central to disc will cause noise as well
Then fit new pads and you should be fine. The discs unlike the pads don't tend to absorb the oil etc. and can be cleaned easily enough.
The nipple seals by a compression of its tip into the caliper body (there is no seal/washer/o-ring), if the caliper is damaged its a new caliper, if its the nipple then you need a new nipple!
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