Brake drum | Scotts Owners Club

This topic has 3 replies, 2 voices, and was last updated 6 years, 7 months ago by BRIAN MARSHALL.

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2nd July 2016 at 4:53 pm #4390

Kevin N Bayliss
Participant

Has anyone had to get a brake drum liner inserted because the drum is too thin to get skimmed again. My front wheel is such a case with a good deal of space between the shoes and drum. With the shoes “closed” I can rattle the backplate and shoes approximately half an inch from side to side if not more. Somebody has added spacers between the cam and shoes to take up this gap. Any suggestions to repair or companies to do this job rather than scrap. Thanks Kev

2nd July 2016 at 9:00 pm #14666

BRIAN MARSHALL
Participant

I would think that with a gap as big as that, the brake has been built up from non-matching bits as it can’t all be wear. For instance I once bought what I assumed was a 7″ brake assembly at an autojumble, but when I tried it in a 7″ drum I realised that it was a 6.5″ brake. It’s still sat on the shelf ! Does anyone need it for a 6.5″ brake drum ?
Brian

2nd July 2016 at 10:12 pm #14667

Kevin N Bayliss
Participant

No Brian, your right its not all wear, unfortunately it has been skimmed before at least once, as confirmed by a Rudge specialist who has also identified both the hub and backplate from a Rudge Ulster with the wide brake set-up which is most wanted by the racing fraternity I was told, not that they will get it from me as the wheel and brake will be most useful when repaired. Just require any info as to who may be able to carry out the work, some advertise wheel drums skimmed without the removal of the tyre, but I suspect that the wheel rim will need to be removed as the hub is so thin the spokes have probably been adjusted too much and pulled the drum out of round, then trued up before fitting internal ring, then wheel rebuilt and finally a light skim to make sure its round and correct size. If only I had a big gap bed lathe I would do it myself. Cheers anyway Kev

3rd July 2016 at 1:35 pm #14668

BRIAN MARSHALL
Participant

Putting a liner into a brake drum is such a safety-critical thing to do that most firms will refuse to do it. Putting a liner into the freezer to shrink it a few thou, and then dropping it into a stinking hot drum, to get a good interference fit, is about the only way to do it, but what will happen when the drum heats up in use !? The liner, in theory, will expand a bit before the drum, but what happens when the drum heats up as well? If the drum and the liner are similar metals then the interference fit should be maintained, but I still don’t like to consider it….
Better to look for a good drum I think.
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