SOHC.co.uk Forums > CB500/550
Rear wheel rotation stiffens up when tightening axle problem.
McCabe-Thiele (Ted):
The brake binding is not present until I tighten the axle as I increase the tightness the binding starts.
To make sure it was not the bearings I removed the linings re-fitted the brake hub - all free.
The only thing that really changes when it is tightened up is the inside edges of the brake shoes are closer to the inside of the wheel. There is no sign of any lip on the liner.
Where the liner meets the wheel internals it looks visually good with no sign of any lip. It might be worth doing some very slight sanding on the inside edge of the brake shoes or even a light shamfer on the outer circumference/edge of the lining.
I did wonder if I could mark the outer edges with some yellow road chalk and see where it transfers to.
Bryanj:
If it is ok with no shoes fitted and done up tight it cant be bearings or brakeplate.
It is possible that the shoes are too wide, you could put a smear of coloured grease( coppaslip comes to mind) on the edges of the shoes and see if it transfers to hub or brakeplate, i have also had shoes where they dont sit properly on the cam as they are fractionally too wide, you said you had to thin the hole end so leave springs off and see if the flat pads sit asquare on the cam.
We are at the mercy of the manufacturers and suppliers of pattern parts who dont seem to take as much care in manufacture.
When available i always use Vesrah, they seem to be a better maker
McCabe-Thiele (Ted):
I have filed down the shoes to enable a washer to be fitted under the split pin.
On closer examination of the brake shoes alloy plate there were a couple of what looked like rub marks on the alloy shoes on the outer edges. This was just on the one shoe. I have done some very light filing of the edge it has reduced the binding substantially when the axel is tightened up.
I am collecting a flap wheel today as well - Bryan -who sells Vesrah brake shoes in the UK?
Bryanj:
Last ones i bought was 7 years ago Ted so cant help much
McCabe-Thiele (Ted):
I was quite pleased with my Flap Wheel that I bought from Scewfix - trouble is it will not fit in the gap between the hub brake lining and the center of the hub - I'm sure it will come in handy in the future!
Undetered I decided to use a pair of those dark green plastic wheels that Ken uses for polishing work. A steady five minutes with them in my Dremell, the brake liner cleaned up really nicely. Hub fitted back in the wheel, nipped up, a couple of high point rub marks on the brake lining near the middle towards the edge of one brake shoe. Hub removed some sand paper on the high points, Repeated twice - all is now as it should be - wheel rotates freely at last!
I've lost count of how many times the back wheel has been removed and re-fitted over the last two days - it was worth perservering to get it right.
Thanks for the tips from those who replied to this post.
Thank goodness for my bike ramp it made it all so much easier - time for a Beer reward!
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