Brake calipers on a 1971 911E

[kolies]

Were aluminum front calipers stock on only 911S's, or also on the 911E?
Also, were the front Al calipers and Steel M calipers interchangeable?

[Scott Clarke]

Aluminum calipers were required with the special hydopneumatic struts used on the 911E. They have 3.5' caliper bolt spacing. The M caliper has 3" bolt spacing, so they are not interchangeable.

[kolies]

I really appreciate the clarification. I thought that I had read somewhere that the aluminum calipers were on the 911S, with the steel ones on the 911E and 911T models.

[Bill Verburg]

Originally Posted by kolies

I really appreciate the clarification. I thought that I had read somewhere that the aluminum calipers were on the 911S, with the steel ones on the 911E and 911T models.

It depended on the year and option package

[Shaun @ Tru6]

Hydropneumatic struts were also an option on the 69S, "Self-levelling Front Suspension $85" and came with aluminum calipers. (first line on window sticker below---need to zoom in)