The BSA A7-A10 Forum

Technical => Frame => Topic started by: bakerlonglegs on 08.04. 2018 22:25

Title: Front wheel problem - brake plate assembly sitting proud
Post by: bakerlonglegs on 08.04. 2018 22:25
Please can I ask for advice?
As part of a '53 A10 plunger project I've had the wheels rebuilt with new bearings. Now the front brake plate is sitting slightly proud of the wheel hub, leaving a small gap (4mm) through which I can see the brake shoes. The new sealed bearings, which came from Feked, are seated properly. If I take the hub bearing locking ring out on the brake assembly side, the brake plate assembly now sits in properly so I'm wondering if the new bearing is wider than the original. With new sealed bearings, can I leave the locking ring out?  Alternatively, is there something else I've not done properly or should check?
Many thanks
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: chaterlea25 on 09.04. 2018 00:19
Hi,
The locking rings have different sized inner holes,  you may have them fitted the wrong way round *????*

John
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: berger on 09.04. 2018 01:07
i have not been at the pub, don't know if this helps but ive had similar happen on my single sided front brake many times over the years and it was ME not getting things lined up to fit together *bash*after wrestling with it many times *pull hair out* *problem*then all of a sudden it all clicks into place *yeah*
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: Greybeard on 09.04. 2018 08:50
The locking rings have different sized inner holes,  you may have them fitted the wrong way round *????*
That was my thought.
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: BSA_54A10 on 09.04. 2018 10:50
yep, the backing plate does not touch the bearing retainer, if it does then it will tear it apart as the wheel turns.
The backing plate has to butt up to the inner race of the bearing.
Do not omitt the split pin to stop the retaining plate undoing.
We have just finished doing the front wheel on a Spit and the new bearings are wider than the originals so we had to grind down the retainers to get the slots to line up with the pin hole.
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: bakerlonglegs on 09.04. 2018 22:15
Thank you very much for the replies - that's identified the issue: both locking plates have the same small size holes. I should have one with a larger hole to allow the brake backing plate to move up against the inner bearing. At the moment the backing plate just rubs against the locking plate because the hole is too small.  Time to order the right part!

Thanks again!
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: Rex on 10.04. 2018 11:08
Best of luck ordering that! I had to scour the WWW to find one only to find I didn't need it after all. If you get stuck PM me and you can have it for the price I paid.
Title: Re: Front wheel problem - brake plate assembly sitting proud
Post by: BSA_54A10 on 10.04. 2018 11:56
Thank you very much for the replies - that's identified the issue: both locking plates have the same small size holes. I should have one with a larger hole to allow the brake backing plate to move up against the inner bearing. At the moment the backing plate just rubs against the locking plate because the hole is too small.  Time to order the right part!

Thanks again!
The only difference between the left & the right is the size of the hole so just cut the one you have larger.
They are only zinc so very easy to work.
Back in the open baring days, a close fit was important but now wea are using sealed bearings it really does not matter if the hole is not exactly round, no one is going to see it.