Quote:
Originally Posted by cRiPpLe_rOoStEr
If could get 3 of these calipers, wouldn't be so bad to make an all-mechanical brake assembly, without hydraulics and vacuum booster...
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Not legal in most states in the US if it's to be registered as a car. Also, many states have laws (I imagine, haven't checked into it directly) against modifying existing brake systems as part of their inspection process to system-types not originally installed (subbing hydraulic for mechanical).
The idea would be to drop the MC size by 1/8th inch (unless moving from drum brakes in the rear) and add the rear fluid master cylinder, then hook a cable to lock it for an emergency brake.
However, in most states, 3 wheelers are registered (can be) as motorcycles and are therefore only subject to the motorcycle inspection procedure. Ergo, they don't actually need an emergency brake or parking brake system and needn't account for brake failure with redundancy systems, leaving him the opportunity to use whatever brake system works adequately for his purposes.
The GM suggestion was just that, and only because it affords a disc brake with hydraulic and mechanical capability, including the disk and a wheel hub with a fairly common 5-lug bolt pattern for which wheels can be sourced from literally 100's of vehicles spanning half a century or better.