Author Topic: Gimme a BRAKE  (Read 865 times)

AleXBR

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Gimme a BRAKE
« on: December 16, 2022, 07:59:08 PM »
Ta da!

Hope this works (I'm trying out the new image facility).

I think it was Ian asking about my B31 pushrod tunnel.
I modified several, then found the pre-war singles had a much fuller/rounder section. Each one took a week to do, with a 1/4'' hand file. See the results below.

Another long drawn out process...

When I first got my BEEZA, I'd been riding pretty quick bikes fitted with discs, so when I jumped on the B31 I was horrified to find it ACCELERATED when the brakes were applied. A well known Brit bike phenomena.
The Ariel type alloy brake is notoriously useless. How Square Four Combo owners (fitted with exactly the same device) survived I'll never know.

So off I went to see a top brake specialist in the region of Glossop.
Drum skimmed and soopadoopa linings. £200ish.

Ran the new linings in for a 100 miles or so, then progressively began to apply more pressure.

Then BANG!!! The damn brake locked! Yikes.
Chamfered the linings, with no improvement.

Back to said expert. ''Ah, no problem, I've just had these new German linings arrive, I'll fit those and you'll be ok''.

Yep, you guessed...BANG!!!!
That was a bigger BANG, as not only did the wheel lock, but it actually bent the lower fork leg, which also locked down!

Some time later I found out Sammy Miller had his Gillera 4 brake done at the same place and consequently threw it up the road at Mallory, breaking a collar bone.
A clean brake, you might say.

You'll have gathered by now what an excellent pilot I can be as I managed to keep the plot upright throughout.

Bugger this, I thought, and went to see an old pal, Bob Hefford, who sorted me out with new/old stock asbestos linings. These got me back to square one, but at least the brake was predictably BAD again.
Managed to get the last remaining new/old stock BSA/Ariel Fork legs in existence from Gaggs, Notts, just as they stopped trading.

In the meantime I met a new friend (Chris), he of Broughs and Vincents.
He's a clever chap with skill sets way beyond my own. So one winter he converted the Ariel sls to tls. Great! Looks splendid/just the job, we thought.

But no. Though the conversion supposedly mirrored a BSA/Triumph tls unit, it transpired to be a twin trailing shoe brake!!! Doh!
To be fair, it did work a little better, but not better enough to justify the work.

Neither of us were happy and nearly fell out over it. Chris promised to look into a hydraulic conversion; actually got all the bits together then quietly decided he wasn't bothered.

Anyway, last winter Chris turned up with an 8'' Norton Hub and a CB77 brake plate.
I went bonkers and turned the hub flanges into 'pie crust', bought s/s Triumph linkages etc, profiled and polished the lot. Chris made a new s/s spindle and laced the wheel together with s/s spokes and rim.

And guess what?
Finally the BEEZA actually stops with purposeful conviction.
Both well chuffed. See the evidence below.

AleXBR

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Re: Gimme a BRAKE
« Reply #1 on: December 16, 2022, 08:03:25 PM »
Hopefully some photo's

AleXBR

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Re: Gimme a BRAKE
« Reply #2 on: December 16, 2022, 08:05:33 PM »
Admin, please delete the first photo (the top one)

AleXBR

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Re: Gimme a BRAKE
« Reply #3 on: December 16, 2022, 08:07:48 PM »
Oh...am all in a tizzy now.
The duplicated wheel photo is the one that needs deleting.
Soz.

mthee

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Re: Gimme a BRAKE
« Reply #4 on: December 16, 2022, 10:22:51 PM »
I admire your patience  with the filing by hand. Another interesting story and well recounted  8)
Fear of the unknown does not mean the unknown needs to be feared

themoudie

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Re: Gimme a BRAKE
« Reply #5 on: December 17, 2022, 12:42:41 AM »
Testing!

Aye Alex, if you go back into your original post on this thread by clicking on the "Modify" button that appears in the top right hand corner of your post, you can then modify the text or remove the attached images of your choice! You then need to click on the "Save" button below the posting, to save your amendments. ;)

No need to wind up "Admin", for whom I am very grateful.  :D

Good health, Bill
« Last Edit: December 17, 2022, 12:47:59 AM by themoudie »

mthee

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Re: Gimme a BRAKE
« Reply #6 on: December 17, 2022, 09:56:45 AM »
As Bill says, no admin so much as an owner, steveH (who does do admin on top of paying to host the site) and his motley crew of grateful guests.
BTW,  Bill, I was watching a Wonder Woman film last night (hi from me, Gal Gadot, if you're  reading this!) in which the premise is an ancient stone grants people's wishes which causes havoc. Anyway, it's set in the 80's and  in the background of an extended shot, mainly of people fighting over what they've wished for, there's a fella lovingly polishing his shiny, new, red Honda Hawk GT! She's  still on my radar, the RC31, marginally ahead of Ms Gadot!
Fear of the unknown does not mean the unknown needs to be feared

iansoady

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Re: Gimme a BRAKE
« Reply #7 on: December 17, 2022, 10:12:24 AM »
A salutory tale re brakes.

I always have mine relined by Villiers Services https://villiersservices.co.uk/ who do an excellent job at very fair prices. I go for the high friction option as I don't ride fast enough to need anti-fade properties. No need for AM4 which anyway grabs horribly when cold.

When bikes like your B31 and my Norton were built, people were reluctant to use front brakes too heavily so they were quite under-specified.

The 7" SLS brake on the Norton works quite well but does repay careful assembly. One thing that improves it no end is centralising the shoes by slackening the wheel spindle, holding the brake on very hard then tightening the spindle. There is enough clearance in the brake plate hole to allow the plate to take up the best position. I'vedone the same on the back drum brake of the XBR500 but have yet to test its effectiveness.

Re your twin trailing shoes, is your brake on the opposite side to the BSA / Triumph? As you say, "mirroring" will give exactly the wrong effect. It will however work very well to stop you rolling back on uphill stops unlike TLS which are useless in these circumstances.
Ian.
1964 Norton Electra
1969 BSA-Suzuki-Steib S501 (the B'Zuki)
1948 BSA C11

AleXBR

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Re: Gimme a BRAKE
« Reply #8 on: December 17, 2022, 10:39:22 AM »
Hi again Ian.

You are quite correct; my dads generation never used their front brakes. Indeed I don't recall him ever fitting new front linings. I'm familiar with the centralizing technique.

The BSA does respond remarkably well if both brakes are applied together. (As BSA point out in the manual). These days we're spoilt with good brakes, but I recon a lot of inexperienced riders have come to grief in a hurry. Probably why anti-lock brakes are de rigueur today.

These days I feel a lot happier if my bikes STOP on demand.