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[Andy B]

Only two types of master cylinder ever fitted to the Omega.

All models upto '97 9193233 and from '97 to end of production the cylinder was 9193218.

Andy

Thought so, thanks Andy

That's confused me ............... Stu says he's always right!   

[2woody]

I think I'm sure that there were indeed only two master cylinders now. 25/20 mm on earlier cars and 25/25mm on later cars.

( ATE, the original manufacturer still list six different ones, mind )

If the OP's car has the later 25/25 master cylinder, then the components will be compatible, as all he's doing is to update his car to the later spec.

If the OP has the earlier 25/20 master cylinder then I would advise against the swap, as these cars are a bit too rear-biased in standard form.

The rear calipers have the piston size cast into the housing, easily readable from the outside. On inspection, you'll find that ALL non-vented cars are 40mm, whilst the vented rear calipers are 42mm bore.

hope this clears it up a bit.