Disk Brake groan / squeal

[kingb]

So my hard tail mtb developed noisy brakes front and rear!

So trouble I thought - I’d just done W2 in Afan so maybe glazed pads - so whipped them out and sanded then - this made no difference!
So next I cleaned the rotors with brake cleaner - no difference.
So I realigned and torqued every bolt - no difference
So I replaced the pads and the rotors for new ones - no difference
I then went to replace calliper seals but ended up replacing the entire calliper and pads (again) - no difference
Finally I cleaned the new rotors again - no difference

I have been riding the bike to bed things in when ever I make a change but I’m now out of ideas but it’s so loud and embarrassing! Before I admit defeat and take it to a shop what have I missed?

[BOR]

Loose spokes?

[BlindedByTheLights]

Stop pulling the coward levers

Sounds like you’ve replaced a lot, which brakes and pads are they?

[oddball1313]

My front brake (shimano Ultegra) howled - tried everything without success, spent £300 on Hope Discs and Calipers and the bloody thing still did it.
Sorted it last week with this,

https://www.bike24.com/p29486.html

[kingb]

BOR said:

Loose spokes?

That’s worth a check! Think they are ok but worth a look

[kingb]

BlindedByTheLights said:

Stop pulling the coward levers

Sounds like you’ve replaced a lot, which brakes and pads are they?

I try to keep off - but the bike doubles as local transport for my 3 year old so they do get used!!

They are admittedly basic shimano diore 2 piston - I replaced with mt-500 after hearing good things on the latest pinkbike reviews

[kingb]

oddball1313 said:

My front brake (shimano Ultegra) howled - tried everything without success, spent £300 on Hope Discs and Calipers and the bloody thing still did it.
Sorted it last week with this,

https://www.bike24.com/p29486.html

Worth a go!

[mike13]

I'd sanded my discs, changed pads, to no avail, found a disc brake cleaner by Bravello on amazon, at last I have peace approaching traffic lights.

[BlindedByTheLights]

I’ve got magura mt7’s with the mdrp performance Discs, best part of £500 and yep they squeal and groan so cost definitely has nothing to do with it. I find if I keep the pads sanded and keep on top of cleaning the discs it keeps it to a minimum. Also check wheel bearings for any movement as this can aggregate the issue.

[remedy]

£180 on Hope RX4s sorted mine.
Damn Shimano BR505 were leaking oil onto the pads every time it was in storage.

Glorious braking has resumed.

[kingb]

Just to close this off - the anti squeal spray did the trick!

Can’t explain why but it’s now perfect