Any tips to straighten rear brake backing plate

YING

YING

Pittsboro,NC
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Any ideas for bending back the rear brake backing plate? I don’t have a lathe but have a good vise if that helps. I can see when spinning it on the drum(off the bike),you can see the clearance varies.I have 1/8” run out difference.
Thanks,
Mike
 
Last edited:
YING said:
Any ideas for bending back the rear brake backing plate? I don’t have a lathe but have a good vise if that helps. I can see when spinning it on the drum(off the bike),you can see the clearance varies.
Thanks,
Mike
Click to expand...
Do you have access to an arbor press ?
 
YING said:
Any ideas for bending back the rear brake backing plate? I don’t have a lathe but have a good vise if that helps. I can see when spinning it on the drum(off the bike),you can see the clearance varies.
Thanks,
Mike
Click to expand...
Assuming pre-MKIII...

They all do that to some extent. How much variance are you seeing?

Usually when fully assembled without a brake plate packing washer (06.7603) the drum will touch the backing plate at some point when turning. With one it should not. It is possible to use more than one, but I've never done that.
 
YING said:
I have those precision instruments but not sure how you want me to use them.
Click to expand...
are you SURE the backing plate is bent, or merely an illusion (with the method you mentioned above) because it's a stamped part, with uneven trimmed labyrinth edges?

Support the plate with wood blocks, figure out which way the mounting hole in the middle needs to go, use the alloy drift & clobber the bitch on one edge, re-check, etc
 
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