Humbug wrote:Well, after a new wheel, new seals and bearings and new Brembo pads, the judder remains! Discs within permissible run out, wheel straight and true. Next will need to be the callipers. Seem a bit sticky on the inside pistons and the ceramic inserts are cracked although mechanic said that cracked inserts wouldn't affect the braking.
Not sure whether to go down the Motorworks calliper repair kit, second hand callipers at £100 each with 6 months guarantee from Motorworks or rebuild of my old callipers at up to £180 each calliper.
To top it all, neutral light not indicating unless I put light pressure on the gear lever meaning bike won't start without this light pressure. Too much and 1st gear selected!!!
Another option of course to scrap the bike and get something with less miles
Clamp off the front brake lines one at a time. That will tell you if it's a disc. Make sure you press the pistons back slightly on the one you clamp off or it'll bind the pad after a short bit of riding as the caliper (and thus the oil) heats up with friction.
My friend had this problem after fitting new pattern discs just last month. Turned out that one of the discs was not even thickness all the way round. Badly ground from new. I measured the thickness of both with my micrometer and one was good, the other varied - not by much but enough to cause huge juddering. I clamped off the braided line with a tiny G-clamp and braking was smooth as silk on the one good disc. He got a pair of replacements from the supplier FOC.
Pics of the disc as measured attached. As you can see the variation was only 0.06mm but it cause massive juddering.
- disk1.jpg (117.85 KiB) Viewed 10096 times
- disk2.jpg (122.74 KiB) Viewed 10096 times
- disk3.jpg (122.78 KiB) Viewed 10096 times
