I'll do. my best to explain what happened at the track today. 1) I have never ridden the bike before today 2) It is a 2009 model 3) I changed the standard calipers for Brembo m4 a few days ago. There are fitted without spacers but do have a set of dowels (bought from this forum. 4) The bike has 16.5 Inches wheels (wets and drys) same manufacturer. When I was changing from dry to wet wheels, I noticed the wheel spacers on the drys were thinner than the ones tie wrapped to the wets. I went with the spacers that had been in place with the drys. Huge chatter when braking, got progressively worse. Removed the wheel and stick in the thicker wheel spacers. The chatter was still present. The natural lie of the forks looked. Could I have wrapped the disks if the angle of the forks were causing the calipers to grip at an angle. I will take the wheel of tomorrow and measure the hub diameters and the spacer sizes. The difference between the spacers was roughly a couple of millimetres per side. I don't mind changi the disk I just don't want to have the same problem again. Could I just have a shagged disk/disks? Any advice would be greatly appreciated
Hi could be just a shagged disc. Take out the pads and see where the discs sit in the slot of the calipers. Idealy should be +/- 1mm. Do this on both wheels to check the wheel alignment. If alls ok can you make the spacers captive? If not mark the spacers with paint pens or similar ie red left blue right. Also mark the wheels the same and direction for quick recognition. See how it goes from there.
Turns out the hubs are a different width and the spacers are sized to match. So could I have warped my disks?
IMO yes you may have and can be tricky to check without some special tools. You should still visually check them through the calipers with the pads removed to see if they look parallel with the caliper slots as they would like as tho they are lying at and angle through the calipers. You will always have massive travel in your lever as tho they were needing bled as the disc would be cupped. Can you check with a dial test indicator or remove them and give to some one that could check this way?
I'm heading to a local mot centre tomorrow to use the brake tester. I'll get an better idea of what's going on. I'm hoping the disk on the drys are good. I can swap them to the wets and test the spacers ect.
