Howard, I have the Lockheed catalogue of the period. A 55 Oxford
Series II and an MGA use the same master cylinder assembly part number 39121.
BTW, the Magnette cylinder is essentially the same with the minor
detail that the brake and clutch bores are reversed! Reason to be
cautious. That check valve in the wrong bore can be "pesky". The MGA
pedal pivot is below the master and the bores face away from the
driver. The Magnette pedal pivot is above the master and the bores
face the driver.
Peter C.
=====
At 10:46 PM 2/18/2008, Howard Battan wrote:
>Can somebody please tell me the bore size for the MGA brake/clutch master
>cylinder? I have a friend in Ireland with a 1955 Morris Oxford Series 2 car
>who thinks that the brake/master cylinder is the same as that for the MGA,
>and needs a rebuilt or new master cylinder. The unit looks the same as the
>MGA unit, but we would like to confirm the bore sizes to be sure. Or if
>someone can confirm that the units are the same, that would be a great help,
>too.
>
>TIA
>
>Howard Battan
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