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Improve Single Leading Shoe Drum brakes - BSA Bantam

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Published on Oct 1, 2010

Annotations must be enabled to see stopping times and braking distances.

Watch the brake lever rather than listen to the engine in the first stop. I pull in the clutch and let the revs die down before braking. Much better synchronised in the second stop.

The braking distances are calculated assuming a constant deceleration force. The often quoted '30 feet from 30mph' in roadtests of old bikes is probably a myth. Cycle World found only twin leading shoe equipped bikes approached this and most of those were in the high 30, low 40 feet range.

Bantam brakes are tiny 5 1/2" diameter. A 7" drum has 27% better leverage on the wheel. Use my techniques and you should be able to make a 7" front drum squeal the tyre.

My modifications improve sls brakes on almost all old British bikes so if you are relying on a sls to stop a Gold Star, Bonneville, A65 etc you don't have to put up with bad brakes. You never know, might just save your life next time a car pulls out in front of you ...

Please visit http://www.ImprovingClassicMotorcycle... for information about the books I write.

I also now make Charge and combined Charge/Oil warning light kits for modern and classic motorcycles. Full details at the above link and you can watch the video here at YouTube.

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