brake shudder - what on Earth is causing it??

bluechair84

Just re-assembled the front end of the bike; put forks in frame (with crown race), tightned all up in the right order, attached caliper to forks - squeezed at lever to position the caliper then tightened the two bolts....

Now the bike shudders like a crazy beast when I'm braking - it's coming from the caliper assembly I'm sure but I can't figure out what is cuasing it... Any ideas? I've a race tomorrow and the bodge fix on my other forks has failed miserably!

nicklouse

bedded in yet?

contamination?

everything tight?

bluechair84

seems to be all tight - I just stripped it all back down again and examined the pads, seems to have worn on a corner suggesting the pads weren't in straight though they seemed to be. rebuilt it all only to thread the adaptor :shock:

I'm now... err... drilling out the cross threaded part of the adaptor to try and then tap into the clean thread further down. Then build it all and see if either a threaded adaptor or misfitted pad had anything to do with it.

Anonymous

Sounds like you need a responsible adult to do it for you.

bluechair84

aah I see what your saying there Yeeha, over to STW I go

I've stipped it down and rebuilt it twice now, bled the brake, realigned the caliper... the only thing I have left is new pads... I thought it was the hub at first but that isn't it.
I'll do the pads but then I'm out.

bluechair84

Got it - it was the wavy rotor. The outer edge hadn't worn the pads as quickly as the rest of the rotor so the pad had become slightly wedge shaped. The fatter part was being pushed in and out repeatedly by the wave lapping past.
Solution; new pads.

Cheers guys.