Re: Rapid, uneven rear pad wear
 

Last two comments. It's only a single piston in the rear caliper. I would have to admit it could be better, but when you release the brake pedal the piston clearly retracts a couple of millimetres. Also the wheel is free to turn by hand, and the disc doesn't get hot in use.

If the caliper piston was sticking, shouldn't both pads wear?

Re: Rapid, uneven rear pad wear
 

He did say in the op it's ok.
Hopefully he did check out all of the movement.
When mine stuck zx6 it soon got the disc warm.

Re: Rapid, uneven rear pad wear
 

If the slider sticks it will wear the pad on the passive side and often wear it in a wedge profile

Re: Rapid, uneven rear pad wear
 

its not the piston that is sticking. the sliders might look ok but in use they might actually be jamming. this would wear the piston side down due to the piston being free to move and the sliders not.

this is why i said service 'properly' the calliper.

Re: Rapid, uneven rear pad wear
 

I think that's what I need to do. When it was apart in the Autumn I didn't have the piston out, and it wasn't as free as I'd ideally have liked, but looked "OK" as I could see it retracting and feel the wheel freeing. The sliding mechanism was completely free, and still is. However something's not right, or maybe two things. If there's a spacer or washer misplaced that could mess up the sliding, maybe by limiting the travel if the calliper's offset in relation to the disc.

Re: Rapid, uneven rear pad wear
 

if there were any spacers missing from the rear wheel assembly you would know about it.

the rear calliper only has 3 anti rattle/squeal shims. 2 are on the pads and the other is on the main carriage and the pads locate into it. now you could have disloged the carrier rattle shim as they are a PITA which might be causing the carrier to jam. other than that the rear brake on the pointy is a very simple affair and not much to go wrong.

can you post a few pics at different angles of the calliper on the bike?

Re: Rapid, uneven rear pad wear
 

Not very easy to get any good angles, but for what it's worth. (By the way, most of the rust-brown is dust from the farm track)

http://i42.photobucket.com/albums/e3...ps360cd760.jpg

And

http://i42.photobucket.com/albums/e3...ps4dac5cca.jpg

Re: Rapid, uneven rear pad wear
 

all looks fine to me. those pads are very thick.

your chain adjuster ends are the wrong way round though.

Re: Rapid, uneven rear pad wear
 

Cheers. New pads just fitted, and there's only just enough room with the piston fully retracted. Can't remember the brand of these pads, they were the cheapest I could find just in case it rips through these in the same short time.

Will have to see what I find with a proper dismantle, I have a spare rebuilt calliper as well so could swap that over to rule out sticky piston. Also wondering if it could be wear in the sliding parts, so they move freely by hand but go slightly squint and bind in actual use.