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MG Midget and Sprite Technical - Rear wheel cylinders

My modsports has a Frog / Midge Mk1 axle in it; are the wheel cylinders 7/8" or 13/16"? I'm having a bit of difficulty identifying some rebuild kits that I've been offered...
David Smith

Dave

Has it got sliding or fixed wheel cylinders? The frog sliding ones are 3/4 and 7/8. If its the later midget fixed cylinder standard is 3/4 I believe, but others fit. I used Cooper S in my modsport axle
Bob Beaumont

Thanks Bob, visually they're the Morris Minor type - I guess they slide. Nothing like the double-piston later ones which is all I've ever used, hence my lack of knowledge on this early stuff.
David Smith

Dave

The bore of the master tends to govern the size of the rear cylinder. If you are using the original frogeye master then the 7/8 cylinder is the norm. I guess as its modsports its got discs and a different master in which case the 3/4" cylinders would be better. They were fitted to later Morris Minor with the 1098 engine so post '63.
Bob Beaumont

Yes Bob, split system front and rear. Both m/cyls are 5/8". Quarter elliptic axle modded for twin trailing links, coilovers and Panhard rod but the backplates hubs and slaves etc all 'look' standard. I suppose I'd better take one apart and measure it before buying new seal kits. And may change them completely on a recommendation from those that know what they're doing!
David Smith

This thread was discussed on 01/10/2020

MG Midget and Sprite Technical index

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