Squeaking brakes on R53

[CrippsCorner]

Hi guys. Had this infuriating issue on my R53 for several months now... started with replacing the pads, then discs, and most recently the calipers and carriers! Including of course new grease and fluids.

Still happening! It happens only on medium to hard braking, but happens every single time.

I've isolated to just one side at the front. My mechanic's recommendation was to 'put my original brakes back on' consisting of, you guessed it, pads, discs, calipers and carriers! So, in all honesty I don't see how that's going to help seeing as though I've two of each already.

Running out of ideas and it's driving me insane. It's just so loud what have I missed!?

[CrippsCorner]

Application. If I press the pedal lightly I can actually ease to a stop without the squeak, but any harder push and it'll do it every time.

Brake lines were swapped out for HEL ones a few months ago. To be fair they're one thing I've not tried two off...

To note, my original setup worked perfectly for around 6 months before the squeaking started.

[CrippsCorner]

I done a bit of research on that but it seems it's a different kind of sound... what I've got is very high pitched.

[CrippsCorner]

I just thought this morning, I've changed that before haven't I... and yes, 2 years ago I changed the wheel bearing. I bought secondhand but it was knackered on arrival so bought a cheap eBay jobbie from China. Maybe that decision is catching up with me now!

[CrippsCorner]

Well it was a relatively cheap part to try, so a new hub and wheel bearing kit went on yesterday... still squeaking I think the only thing left to try is a bullet to the temple!

[CrippsCorner]

Well we've had it on a rolling road and it only happens on brake application... (if I didn't mention before, only on one side)

Suggest away!

I've been recommended a Mini specialist so I'm going to pop in for a chat after work.