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ES2 Front Brake Drum

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ES2 Front Brake Drum

Posted by roger_allen at August 22. 2017

I have a 1955 model ES2, exported new to the US and first registered in 1956. It has an 8" single-sided front brake drum with an aluminum alloy brake plate. The Replacement Parts Catalogue for a 1955 ES2 shows a 7" single-sided front brake drum with a pressed steel brake plate.  The Maintenance Manual/Instruction Book which claims to cover 1955-1963 ES2 and other models shows the same 7" brake as well as an 8" full-width drum with an aluminum alloy brake plate. A photo from a brochure for 1955, sent to me by Chris Streather of NOC, shows an alloy brake plate.

The parts lists and diagram in the Parts Catalogue matches my actual hub with the exception of the spacer between the brake-side bearing and the brake plate, and the brake plate itself (and the size of the drum, of course).

Does anyone know why there's a difference between documentation and reality? Were there customer options? Was this a phase-over period?

And does anyone know the part number for the bearing-to-brake-plate spacer? What I found on disassembly was a brass ring with a 1" o.d., .9" i.d. and .080" thick. The i.d. is way too large, should be a sliding fit on the wheel spindle so that it centres properly inside the felt washer. Norvil has their part number 067608 which, by its description, may be what I need, but it would be nice to know for sure.

Thanks!

- Roger

Re: ES2 Front Brake Drum

Posted by alan_rogers at August 23. 2017

The 8 inch 1/2 hub was introduced in 1954 so is correct for 1955, though from memory the spacer that you refer to is part of the alloy brake plate.

Al

Re: ES2 Front Brake Drum

Posted by roger_allen at August 23. 2017

Thanks Al. When I assembled everything without the spacer the brake plate touched the edge of the brake drum, the spacer gave me the clearance I needed. I do need to double check that the non-brake side bearing is fully seated and that I didn't tap the brake-side bearing in too forcefully against the centre spacer before screwing in the lock ring tightly on the non-brake side.

On final assembly with new bearings and felts, I will need to make sure the boss on the inside of the brake plate slides inside the felt washer and does not pinch it against the bearing inner race. It's a close fit so is there a trick to that?

- Roger

Re: ES2 Front Brake Drum

Posted by Ian MacDougall at August 23. 2017

The felt seal is usually retained by a pen steel washer that is peened into the hub. I wonder if your brass ring was supposed to that job, although I appreciate your observation re plate to drum clearance. If the pen steel washer is in place that should keep the felt seal away from the boss. If you use a bearing with a single rubber seal it would make the felt seal and pen steel washer redundant. Be careful with this option as some of the sealed versions of the double row bearing are slightly wider than the non sealed bearings. If the bearing seats against the internal spacer, rather than a step in the hub, then reducing the length of the spacer can compensate for the wider bearing (and, with careful measurement, give the extra plate to drum clearance that you need without an extra spacer).

Ian McD

Re: ES2 Front Brake Drum

Posted by roger_allen at August 23. 2017

There was a flat washer between bearing and felt, and another flat, not dished, washer peened into the hub. Both with sufficiently large internal diameter so as to not interfere with the boss on the brake plate.

I ordered the non-sealed bearings and full sets of felts and washers for both wheels. The wheel project will be on hold until they arrive, I'll get the forks reassembled and in place first; I think I have all the new parts I need for that.

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