Late

Late-Model 911 Brake Caliper Piston
Reference Chart

Starting with the 964 model 911s, each of the 4 brake calipers had 4 pistons. Use the chart below to help determine the appropriate piston diameters on the calipers for your late-model 911, then select the proper piston seal kits to match. 2 of each seal kit are required per caliper.

NOTE: These charts are provided for reference only. We highly recommend that you verify the correct piston size used on your vehicle prior to ordering any parts.

Caliper Piston Diameter - Air-Cooled Models
*Model*	Front Piston 1	Front Piston 2	Rear Piston 1	Rear Piston 2
*964 C2 ('92-on)/C4/RS America*	40mm	36mm	30mm	28mm
*964 C2 Turbo-Look*	44mm	36mm	34mm	30mm
*964 C4 Turbo-Look*	40mm	36mm	34mm	30mm
*964 Turbo*	44mm	36mm	34mm	30mm
*993 C2/C2S*	44mm	36mm	34mm	30mm
*993 Carrera RS*	44mm	36mm	36mm	30mm
*993 C4/C4S*	44mm	36mm	30mm	28mm
*993 Turbo*	44mm	36mm	28mm or 30mm	28mm

NOTE: The seal kits used for these liquid-cooled models are not backwards compatible for use on the calipers of earlier air-cooled models. Beginning with the Boxster and 996, a single piston seal repair kit covers both (two) opposing pistons. Therefore, these models generally require 1 of each seal kit per caliper.

Caliper Piston Diameter - Liquid-Cooled Models
*Model*	Front Piston 1	Front Piston 2	Rear Piston 1	Rear Piston 2
*996 Carrera*	40mm	36mm	30mm	28mm
*996 C4S*	44mm	28mm, 32mm or 38mm	30mm	28mm
*996 Turbo*	44mm	36mm	30mm	28mm
*996 Turbo w/ PCCB or GT2*	32mm or 38mm	28mm	30mm	28mm
*Boxster/Boxster S*	40mm	36mm	30mm	28mm