LWB front suspension and brakes

[davep]

I did not find a previous thread so started this one. I am not certain of exactly what combinations of struts, hubs, calipers, and rotors were standard on which models, and what the upgrades were for each. What I want to do after establishing a base set is to document the options available to upgrade.
M103 is an option for at least the 911T to upgrade to Koni shocks all around; supposed to be available 1970 & 71. M402 succeeded M103 for 1972 and applied to 911T & E for a price of $83 and M402 for 911S cost $41. I am guessing from the pricing that the brake calipers were upgraded also; thus they got the S calipers.
Note that these prices are a differential price between the new parts and those they replace. Many options are priced this way except those where there is nothing to replace.

A couple of questions. Did the 911T get solid rotors with unspaced M calipers front and/or rear? If solid rotors on the front, were the hubs different? If solid rotors on the front, was there an option to upgrade to vented rotors and spaced calipers? When did vented front rotors become standard on all models? When did vented rear rotors become standard on all models? The 912E can be included in this discussion.

[Scott A]

In this book I have from 1976.
It stated, vented disc standard on T for 2.2 cars.


And for fun. It stated. First vented came on S (don't know about racing cars)




Silly portrait iPhone photos come in sideways

[raspritz]

My USA spec ‘69T has solid rotors and unspaced M calipers front and rear, and pretty sure the same hubs front and rear (will check and update if that is wrong). I have a lot of ‘69 literature I can check as well.

[davep]

In this book I have from 1976.
It stated, vented disc standard on T for 2.2 cars.
And for fun. It stated. First vented came on S (don't know about racing cars)
Silly portrait iPhone photos come in sideways

So it appears that 1969 911T, and perhaps 912E were the last to have solid rotors.
First vented on 1967 911S, and possibly an option for 911.
Portrait photos are rotated by forum software to fit our screens better.

These Service Information booklets are very useful for this discussion.

[Jim Breazeale]

I did not find a previous thread so started this one. I am not certain of exactly what combinations of struts, hubs, calipers, and rotors were standard on which models, and what the upgrades were for each. What I want to do after establishing a base set is to document the options available to upgrade.
M103 is an option for at least the 911T to upgrade to Koni shocks all around; supposed to be available 1970 & 71. M402 succeeded M103 for 1972 and applied to 911T & E for a price of $83 and M402 for 911S cost $41. I am guessing from the pricing that the brake calipers were upgraded also; thus they got the S calipers.
Note that these prices are a differential price between the new parts and those they replace. Many options are priced this way except those where there is nothing to replace.

A couple of questions. Did the 911T get solid rotors with unspaced M calipers front and/or rear? Yes. 911s and 912s never got vented on one end and non vented on the other end. The only Porsche that got that was a 914/6 that got vented (M calipers) and non vented rears.
If solid rotors on the front, were the hubs different? No. The hubs were the same
If solid rotors on the front, was there an option to upgrade to vented rotors and spaced calipers? I think so, but can't say for sure
When did vented front rotors become standard on all models? 1970
When did vented rear rotors become standard on all models? 1970
The 912E can be included in this discussion.

The 912E used non vented rotors from a 69 911T. They did get A calipers on the front (with no spacer) with 3.5" bolt spacing, though.

Regards

Jim
Trust but verify

[davep]

Thanks Jim, that answers a lot of questions. Let me think up a few more. I am still trying to puzzle out the 3" Koni with M caliper vs the 3.5" Koni with S caliper. I have the M103 option for 1970 & 1971 followed by the M402 in 1972 for Koni all around. One 1970 911T with M103 has 3.5" Koni with S caliper; I am fairly convinced this is original since strut are week 7/70 and the car is an 03/70 completion. If correct, then I still have to find the option for the 3" Koni with M caliper; I am not sure of the period where this option was available.

[Jim Breazeale]

Thanks Jim, that answers a lot of questions. Let me think up a few more. I am still trying to puzzle out the 3" Koni with M caliper vs the 3.5" Koni with S caliper. I have the M103 option for 1970 & 1971 followed by the M402 in 1972 for Koni all around. One 1970 911T with M103 has 3.5" Koni with S caliper; I am fairly convinced this is original since strut are week 7/70 and the car is an 03/70 completion. If correct, then I still have to find the option for the 3" Koni with M caliper; I am not sure of the period where this option was available.

You are not thinking of SWB stuff, are you?

Regards

Jim