You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
have a friend's cube in for squeaky brakes.
Shimano base type calipers as per our, mt-510 I think
have gone through the usual suspects;
1. cleaned rotors with ipa(not beer)
2. new pads.
3. aligned caliper by pulling brake hard in and tightening mounts
4. aligned caliper by eye
5. bled brakes several times.
6. stripped caliper, removed pistons, cleaned lubed seals with mineral oil (Shimano original), rebuilt and rebled.
after all that they still squeak.
took my slx brakes off my bike and fitted to cube with my rotor that don't squeak and they squeak on the cube. back in my bike no squeak.
front and back brakes both do it, both on post mount with cup washers.
any ideas or just set fire to it?
Front, rear or both? Next step would be facing the mounts for me
both
sand the discs.
done that as well ☹️
Why would a Shimano brake be on cup washers?
Shimano supply the cup washers that you should use if fixing them onto the post mount adapter required when you increase the rotor size (e.g. fitting a 180 rotor to a 160 fork).
I'm with Mashr...
Find a bike shop with the kit to face the mounts.
Sounds like you've tried everything else.
This cured a squealing brake I had once after trying everything you have as well.
If the same set you are using only squeaks only the cube it shows the brakes are probably not the issue. Carefully check over the setup to see if anything looks suspect. Bolt threads worn in the frame / fork, mount points not square/ damaged etc.
Do the same for the wheel hubs, the discs can transfer the vibrations through the whole wheel. Take the bolts out the disc and offer it up to the wheel, see if there are any high points where it's causing issue
wheels are centerloc too!
but as scotroutes says I've got the washers in, tried different bolts, diggerent adaptor, no cups with shorter bolts???
how do you face a post mount?
You do have the washers in the right place?
You used to have to face IS mounts due to the alignment, never really heard of having to face Post Mount, as any misalignment would be minimal, and only affect the rotor width alignment, so not much difference.
As others say, check the washers are correctly assembled, and when centring the brakes, i tend to use an alignment tool, the one you put between the rotor and pads to get the spacing when pulling the lever.
washers are correct checked that and changed for another set too.
I've seen park do a post facing tool but be a bit odd that a set of forks and a frame both need doing wouldn't it??
I'll try the alignment tool any recommendations?
I'm sure they're all the same. I use one of these
https://www.weirdosonbikes.com/product/disc-brake-spacers/
It does seem weird that the same problem occurs when fitting your own SLX brakes too. That rules out contamination, leaks, rotor/pad compatibility and almost everything I can think of.
Objecting to being bolted to a Cube?
https://bike.shimano.com/en-US/information/news/brake-pad-breakdown-metal-versus-resin-pads--what-you-need-to-kn.html
https://vimeo.com/568493929/17381c9590?embedded=true&source=video_title&owner=19780599
This might seem weird ... have a good look at your cone washers. I had a really squealy brake and it turned out one of the washers had a crack in it that I hadn't noticed. Had to buy a new bolt in the end but doesn't squeal now.
Huh, I've never used cone washers on adapters like that. I best check my bikes over the weekend.
Shimano resin based rotors and sintered pads?
Cheaper Shimano rotors are resin only pads. I mad the mistake of fitting sintered pads to my road bike not realising rotors were “resin only”. Was embarrassing to ride.
Back to resin pads and job done.
I’ve never faced any braking mounts as long as i csn get my alignment sorted and never had an issue.
Squealing has always been a pad problem.