PMB is a great source for everything about braking with your 914. Here is one way to go.
The 914 V-Caliper kit was designed to allow teeners the use of a 911 vented rear rotor on their 4 or 5 lug cars (If you’re going to remain 4-lug you’ll need to have the 911 rotors drilled for the 4 x130mm pattern). If you’re mechanically inclined and you want to rebuild your own calipers, here’s your money saving alternative.
These kits are designed to work on the 1973 through 1976 (late) calipers that use the machined caliper nose and hex bolts. The early through bolt hardware is no longer available in the States and would be cost prohibitive. Everything in this kit will work on an early caliper with the exception of the hardware.
The kit includes:
* (4) Caliper spacers (enough for two rear calipers)
* (8) Longer 11mm hex bolts.
* (8) Caliper seals.
* (4) Longer brake pad pins.
* (2) Rotor spacers drilled for 4 or 5-lug applications (vented rotors need to be drilled for 4-lug applications.)
This application will now use the standard 1970-1983 vented rear rotor. The vented rotor will need 4mm turned off the outside edge (8mm total). You will also need a 911 rear brake caliper accessory kit to modify the 914 rear pad springs with the wider spreader.
http://www.pmbperformance.com/catalog/item...563/5314821.htm