Author Topic: Brake arm angle (topic extracted from 'A10 chinese speedo')  (Read 508 times)

Online Greybeard

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believe it or not but ALL the brake components are BRAND NEW. It's the mismatch of brake cable length and operating lever that I have to redo. works superbly in spite of that.
I beg to differ. The operating arm needs ideally to come to 90° when the brake is applied. When that brake is applied it will be well past the best leverage.
Greybeard (Neil)
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Offline A10 JWO

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Looks like my brake arm on the signature photograph before the repair.

Online Greybeard

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Looks like my brake arm on the signature photograph before the repair.
Maybe. My eyes are not that good!
Greybeard (Neil)
1955 Golden Flash, sprung frame
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Online Topdad

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After say my front (8" single sided ) is getting very close to max adjustment (adjusters at h/bar and wheel ) but the arm is still in the right position was still working well  methinks  I'll look into a new cable first
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Online Butch (cb)

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Need to watch it won't go 'over cam' I guess.
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'58 S/Arm Iron Head Flash Bitza


Online Greybeard

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Need to watch it won't go 'over cam' I guess.
I think it's more that you are reducing the leverage that is applied to the brake. The term 'Moment Arm' is at the back of my mind. It must be just as bad if the lever was too much the other way. Obviously 90° when brake is applied gives best result; same with the clutch lever on the gearbox.
Greybeard (Neil)
1955 Golden Flash, sprung frame
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Offline a10gf

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Need to watch it won't go 'over cam' I guess.

That should be impossible... cam will surely (maybe? :O) not have clearance to 'go over' even with shoes down to bare metal, that said there may be worn out \ defective \ non-original parts in use, so always be safe and check everything.

As for the angle, I think Greybeard is very right.

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Online Butch (cb)

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Need to watch it won't go 'over cam' I guess.

That should be impossible... cam will surely (maybe? :O) not have clearance to 'go over' even with shoes down to bare metal, that said there may be worn out \ defective \ non-original parts in use, so always be safe and check everything.

As for the angle, I think Greybeard is very right.

Don't know about an A10, I managed it on a little 250RS I was running on the cheap. I'd 'readjusted' the brake arm in accordance with GB rules to maintain efficiency, but as the cam gets to full extent it locks the brake on. Eeek said both the rear tyre and I.

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'58 S/Arm Iron Head Flash Bitza