juddering under heavy breaking

[embee]

The cheapest and simplest thing to try is brake cleaner on the disc and pad. I've found it will often solve the problem.

I get brake cleaner from the "Pound Shop", costs.......well, £1.

According to the various brake gurus, pad material does get transferred to the disc surface, and if this occurs in different amounts around the disc you'll get judder/vibration. This is often wrongly diagnosed as warped discs. Fitting new discs cures the problem therefore it must have been warped discs, right?

There are recommended procedures for conditioning discs and pads, basically start from clean/new and in succession progressively brake harder from faster speeds. They need to get hot. In cars the recommended procedure can result in smoke and discolouration (depending on how good the brakes are), but people will rarely be prepared to give their brakes this much grief. On bikes it's probably difficult to do this hard enough to cause a problem.

Note - this is only based on what I have read, so do your own research to verify/shoot down in flames.

I know there have been issues with production cars when disc castings have had the wrong trace element mix in the iron which creates slightly different solidification/crystallisation and thus different friction coefficients round the disc. Probably not relevant here.

its the head bearings

[timwilky]

Ovis. Just drop it in ere for a few mins whilst we give it the once over. If it looks the same when you carry it out. nothing wrong. If it dont...


Yup summet up wiv it

Originally Posted by hovis

its the head bearings

How did you arrive at this conclusion hovis? I was hoping, for your sake, it was something simpler set my freind back a fair wad of cash to get his bearing prob fixed.

Matt

Were you riding over 'traffic calming measures' when braking mate??

Originally Posted by alpinestarhero

How did you arrive at this conclusion hovis? I was hoping, for your sake, it was something simpler set my freind back a fair wad of cash to get his bearing prob fixed.

Matt

took it for a tyre change, and the machanic told me

im going to try to tighten it first

mechanic said £35 parts + 2 hours labour, but i will get my mate to do it.... hopfuly

Anyone else think 2 hours is taking the ****?

Originally Posted by Flamin_Squirrel

Anyone else think 2 hours is taking the ****?

is it?

I think two hours is reasonable, they want to add in a bit of extra time to do it slowly and carefully.

If you can get a mate to help you, then that would be better but 2 hours isnt so bad I dontr think

Matt

its a haynes 4 spanner job