23.8 mm Master Cylinder
 

Thanks for the feedback-

Car is has unboosted brakes, Master cylinder is at the bottom of the firewall in line with the pedal.

Car is left hand drive- VIN number 930 770165. I ws told by many that this car should have a boosted brake set up, but it does not, nor has it it been altered by previous owners, or by have a new nose / front section grafted on. I suspect this was a change over model.

I do have a boosted MC from a 930 I think it is a 930, seems to be 23.8 mm) , but do not have the pedal box, and as I may change the gearbox to a G 50 shortly ( relatively shortly) I don't want to get a pedal box with a cable clutch and boosted brake pedal, then change later to another pedal box with hydraulic clutch pedal and boosted brakes-

Thanks

Mark