Difference between brake calipers....

[Neunelfer]

No... do tell. I smell wall art for the shop! LOL

[MarkS]

For 1967 & 1968 the 911S used vented rotors front and rear. The standard front calipers got 7mm spacers and longer bolts to hold the halves together. In the rear the S caliper also got spacers, but the piston size was increased from 35mm to 38mm diameter. The cross-over line and the bolts were longer as well.

Per davep rear pistons got increased in diameter but the brake pad stayed same size as a non S.

[Flieger]

No... do tell. I smell wall art for the shop! LOL

Marco was giving them away. I believe he had one pair. I got 1/2 of it- one annulus.

Thanks Marco!

[davep]

http://www.early911sregistry.org/for...Discs-...-FREE

[RS SIEG]

Eric (AKA "NeunElfer") continues to amaze me ! What a guy...an amazing source of Porsche brake info. AND his products are absolutely the best. Thanks Eric.

[tcsracing1]

apart from the gussets, is there any way to date code 67/68S front calipers?

[Neunelfer]

Tom, those pictures on page one are what I'd like you to look for when core hunting. This will guarantee a 67-68 core.

[tcsracing1]

for my 1969T, i am converting it to 1969S brakes.

The front struts need to be changed to accept the aluminum callipers.
What would need to be changed on the rear to convert to the 69 calliper for vented rear discs?

[tcsracing1]

As Mr. Pateman mentions, the real difference between the S those years and the regular 911's were the 7mm spacers up front and a slightly different caliper in the rear. The front calipers were in effect the first vented M-Caliper. There are some casting differences but they are slight and in overall appearance and function, they are identical. The rears were a slightly different animal. They did take the L-Caliper casting and bored it out to 38mm as Dave mentions. This makes for a very thin and fragile dust boot clip surround. They also used 7mm fasteners (vs. 6mm on the standard L) with the 10mm spacers. They also came with a pair of dog bone spacers to allow the caliper to line up over the new rear vented rotors. Castings all seem to be slightly different but, that almost goes car for car with those L-Calipers and Wide L-Calipers. Some early L-Calipers were actually mis-matched bastards with 356 caliper 1/2's mated to a later L-Style back 1/2. We found this on a couple of cars, one was a German MasterTech 66 car.

See the sharp angled gussets under the caliper wings on these? This is how you know you have the correct, very early 911S M-Caliper on your car. Many have been replaced over the years (dealerships etc):


Here's a better shot of the gussets from underneath. Later M-Caliper castings had this area smoothed out:

If the calliper has the spacers but dosnt have the sharp angle gussets underneath, what model year would they be for?

[chris_seven]

A 1969 car has a different caliper on the rear and a different rotor to a SWB car.

The rear is an M Type with a 38mm diameter piston, mounting centres are 3" and they would be identical in fitting from 1969 until the introduction of the 42mm piston caliper used on the 3.2 Carrera.

The 1969 T would have used solid discs both front and rear and all other models would have used a ventilated rotor and a caliper with the appropriate spacers to make them wider.