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Two,
You'd need to be a contortionist in a way I can't imagine to see the wear marks on the left (swingarm) side though you might get a small mirror and light to help.
The rear brake floats so that the pressure and wear on the left and right pads should be the same. None the less, the left side may wear just a bit more. If the indicator grooves are clear and apparent on the right hand side, the left hand side should be OK too.
It's not a terribly hard (or messy) job to actually pull both pads out to confirm.
Loosen the two hex-head bolts on the upper section of the calipers - these two bolts are the pins that hold the pads in place.
Loosen and remove the two bolts on the lower part of the calipers - these hold the calipers to the hub flange.
You do not need to loosen or do anything to the brake hose!
You can lift the calipers up from the disk and finish removing the two hex-head bolts. With these two pins out, the pads can be pulled out and inspected. Don't worry, there's no brake fluid right behind them.
When re-installing, slip the left side pad in place and insert both hex-head bolts enough so that they go through that pad but not much further. You'll need to push up on the pad (against the pressure of the anti-vibration spring that lives in the calipers above the pads) to get the bolts to go through. Repeat with the right side pad, again pushing up against the spring pressure and pushing the pins through.
Slip the calipers over the disk (you may need to work a bit to keep the pads spread apart).
Insert and tighten the large bolts and then tighten the hex-head bolts.
[ This message was edited by: PaloAlto on 2006-06-08 20:00 ]
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