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Master Cylinders:
In general, the single piston caliper require the 944 MC, while the 4 piston brembo's can get away with the stock 19mm dual circuit MC's. Regardless of chassis origin (ie, 951, 985, 993,996 etc), most of the Porsche calipers use similar sized pistons in their calipers. The listing below deals with the 944 setups, but can be extended to cover most of the Porsche based brakes setups (4 piston calipers). For the 944 setups, we recommend the following master cylinders:

944 Normally Aspirated (atmo): Use the 944 master cylinder (23/19mm). There is no provision for the brake light switch, so put a tee on the rear circuit and plumb in the switch (make sure the terminals face down so that you don't trap any air). Remove the resevoir bottle from the 944MC, and use the line fittings and rubber grommets from your stock VW MC. That way you can connect to your stock VW resevoir. (Note, original German line fittings are too small for the 944MC, use the ones on the aftermarket Brazilian VW MC's.)

For beam suspension T1's, the 944 MC bolts up. You need longer bolts and nuts (M8x55) because the 944 MC is not threaded in the mounting holes like a VW one. You have to shorten your pushrod a little (about 14mm) and you're set.
For 1302's/1303's the stock vw MC bolts up at and angle to the chassis, and bolting in the 944 MC will make it sit at an angle. VDubEngineering manufactures a MC adaptor kit that includes the adaptor, all hardware and the required longer pushrod.
For T2's, VdubEngineering manufactures a MC adaptor that allows the use of the stock T2 pushrod.


944 Turbo: VdubEngineering has had good success using the stock dual circuit (19mm) MC. The pedal is good and because of the small diameter, you can generate high line pressures with minimal pedal force. If you require a taller pedal, put in the 944 MC. We highly recommend you try the 944T brake setup with a 19mm before jumping the gun on a 944 MC. The pedal ratio of T1's is low, so the a larger 944 MC will require more pedal force to generate a high line pressure. This is something the ladyfriend might not appreciate when she drives the beast.

For T1's, use the stock dual circuit 19mm MC. If the pedal is not to your liking, then change to the 944 MC.
For T2's, use the 944MC because it fits easily and the higher pedal ratio of the T2 allows higher line pressures with the a minimal amount of pedal effort.