Bloody Brakes!!!

[The Stranger:Me]

Worse cold or hot?

Aren't they full floating? Have they been checked on an engineers surface plate for runout or just using a DTI?

Could be a the hub, even if full floating.

With a dial indicator, which is the method shown in the manual.

It is getting progressively worse, so I would tend to think it is wear related. The hub being out of true would imply an event wouldn't it?

[FROSTY:Me]

Mate another though given the bikes history --Im concerned about the condition of the calipers.Just wonder if anything is a bit dicky die maybee only showing up when the pads are worn past a certain point.
maybe the pad hangers or one sticky piston

[riffer]

You haven't taken the shims off the brake pads at the last change and forgot to put them back on have you?

[Robert Taylor]

Mate another though given the bikes history --Im concerned about the condition of the calipers.Just wonder if anything is a bit dicky die maybee only showing up when the pads are worn past a certain point.
maybe the pad hangers or one sticky piston

The calipers may well be causing issue and should be stripped and checked. Even though the disc runout is within factory tolerance 0.15mm runout IS a LOT and will cause either all or contribute significantly to this problem. This is just the sort of bike that is sensitive to such issues, its not a GN250, for example.

Back in the late 70s I had to fix a traffic department XS650 which had a frightening high speed weave at speeds in excess of 130km/h. In a less enlightened age ( maybe ? ) they werent too careful where they put weight on these bikes ( emulated by todays packracks ) so they were rear end heavy, much of that weight behind the rear axle centreline.

Riding this bike was frightening as it used ALL of the road at elevated speeds. I went through all the usuals, alignment, suspension set up ( what there was then ) tyre balance, pressures, head race condition and correct tension etc, totally to no avail. Disc runout was 7 one- hundreths of a millimetre. When replaced the problem was fixed.

The message here is that hyper performance bikes such as the GSXR1000 are very sensitive to such issues.

[Coldrider]

I had these issues a few months ago, I replaced a disc that had 0.12mm warp, problem fixed. I had previously replaced the head bearings so these weren't the issue, replaced the front wheel bearings prior to biffing the disc.
I know this is not what you want to hear, I had totally forgotten what good brakes were.

[imdying]

The disks appear to be fine - LHS=.19mm run out and RHS=.15mm, limit is .30mm. Front wheel run out (axial) is .71mm, limit is 2.0mm.

In tolerance or not, that's pretty ghey.... 0.3mm is massive. Something else to check, measure the thickness of the disc at say 6-10 points around the disc, it might have some thickness variation.

[Nicksta]

Mr Taylor's on to it dude.. and man, if its worse than when we took it on Taupo, thats a very, very scary thing indeed.... Bruce said the disks were warped then and needed replacing.... poor 66

[The Stranger:Me]

Mr Taylor's on to it dude.. and man, if its worse than when we took it on Taupo, thats a very, very scary thing indeed.... Bruce said the disks were warped then and needed replacing.... poor 66

I have replaced the disks sinse then, but they have been blue quite a few times now also.
I stripped and rebuilt the calipers last weekend, replaced the pads and tightened the head bearing a little.
Haven't had a chance yet to give the brakes hell, but it is certainly a LOT better.

Don't worry, still looking after it mate.

[Kwaka14]

Try the brake pads, I think the K3 runs the same radial brakes as in the zx12 and I have had problems when the pads are low with the bike shuddering, totally clkeared up on new pads - checked the runout with no issues (using a straight edge which was a bit dodgy). so tried pads and sweet as.

Should have read your previous post huh...

[MVnut]

reckon it's warped discs mate, maybe the old owner tried to keep up with an MV

[Nicksta]

Haven't had a chance yet to give the brakes hell, but it is certainly a LOT better.

Don't worry, still looking after it mate.

10 chars......

[The Pastor]

Bent rim or axel? (front AND rear)

Could be bent frame?

Did you change the rear wheel bearing?

I don't know much about these things, this is just what ixion told me when i had the problem with the gpz, he said shuddering can be caused by the wheels being out of alignment eg underbraking the rear wants to go in a differnt direction to the front?

Good luck, there are so many causes. (i never did fix my bike, but i think it was bent forks)