Front and rear and how man piston are the calipers?

 

Paul,

911SC brakes have two pistons per caliper. In the front they are 48mm and in the rear they are 38mm. And while on brake specs, front rotors are 282.5mm x 20.5mm when new, and rear rotors are 290mm x 20mm, and both are vented.

 

Bill
How do I recognize the vented brakes? I thought if they were vented they had drilled rotors. Mine don't.

82 911SC

 

This is a vented and drilled 309x28mm 930 rotor. Yours are smaller and do have the radial venting but not the axial drilling.

<img src="http://www.pelicanparts.com/MotorCity/wmv/S4_rear_app2.jpg" alt=" - " />

specs for most 900 series cars are <a href="http://www.pelicanparts.com/MotorCity/wmv/brakes.htm" target="_blank">here</a>