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964 and 944 Turbo/968 brakes interchangeable?

 
Old 03-07-2019, 06:37 PM
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James G.
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Default 964 and 944 Turbo/968 brakes interchangeable?

Apparently 964RS and 968 M030 rear rotors are the same part from the factory.

My question is this.
Will anything that will bolt up to a 964 also bolt up to a non M030 944 Turbo/968?

I can't find anything saying it will but it seems like it all will bolt right up.

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Old 03-07-2019, 10:17 PM
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Dammit....now the 911 guys want our brakes.

Is nothing sacred?!?!

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Old 03-07-2019, 10:32 PM
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Originally Posted by Jay Wellwood View Post
Dammit....now the 911 guys want our brakes.

Is nothing sacred?!?!

Water.



T
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Old 03-09-2019, 10:26 AM
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James G.
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Originally Posted by Jay Wellwood View Post
Dammit....now the 911 guys want our brakes.

Is nothing sacred?!?!

I don't want your brakes or a 911. Nobody seems to make a really big "big brake kit" for the 968. But if the parts from a 964 bolt up it's solved.
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Old 03-09-2019, 11:38 AM
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I thought the brakes in the 968 M030 package were the same as the 928 S4 which were also used on the 944 Turbo S and S2 with M030.
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Old 03-09-2019, 03:44 PM
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I have the same understanding.

Porsche 928 GTS front calipers are the next size up in this family. I don't know how the 993 calipers stack up. IIRC, the 993 front and rear calipers are the same size.
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Old 03-09-2019, 05:01 PM
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Rotors are the same, according to PET. That said, a 964 RS is pretty rare - rarer than a 968 M030.

According to PET, rear 968 calipers are 28/30 mm pistons. The 964 RS/Turbo rear calipers are 30/34.

Some 964 front calipers are 36/44 - they are probably the same body as the M030 caliper (but I don't know for sure). That said, they are leading calipers so the crossover pipe and bleeders are reversed from a 968 application.

Originally Posted by James G. View Post
Nobody seems to make a really big "big brake kit" for the 968.
The only bolt-on upgrade is the 993 TT calipers on an M030 spindle. Still not a great upgrade by today's standards.

Originally Posted by James G. View Post
But if the parts from a 964 bolt up it's solved.
Nothing from a normal production 964 is an upgrade over the 968 M030 brakes. The Leichtbau, S, and RSR models probably have bigger brakes.
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Old 03-11-2019, 03:12 PM
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Originally Posted by FrenchToast View Post
Rotors are the same, according to PET. That said, a 964 RS is pretty rare - rarer than a 968 M030.

According to PET, rear 968 calipers are 28/30 mm pistons. The 964 RS/Turbo rear calipers are 30/34.

Some 964 front calipers are 36/44 - they are probably the same body as the M030 caliper (but I don't know for sure). That said, they are leading calipers so the crossover pipe and bleeders are reversed from a 968 application.



The only bolt-on upgrade is the 993 TT calipers on an M030 spindle. Still not a great upgrade by today's standards.



Nothing from a normal production 964 is an upgrade over the 968 M030 brakes. The Leichtbau, S, and RSR models probably have bigger brakes.
I'm asking because I can get much bigger brakes for a 964 but not a 968. So the idea is to simply pretend the car is a 964-when ordering. I'm expecting to need to reverse the bleed tubes.
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Old 03-13-2019, 01:08 PM
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I think I have this solved. I hope I do because it's about to be ordered. If it works I'll end up with 380x32 front rotors with 8 piston calipers and 356x28 rear rotors with 6 piston calipers. If it goes to plan it all fits under an 18" wheel.
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Old 03-13-2019, 02:46 PM
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Good luck and keep us updated James!
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Old 03-13-2019, 03:46 PM
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Originally Posted by James G. View Post
with 380x32 front rotors with 8 piston calipers
Have you measured everything? Unless the caliper is a low-profile motorsport caliper, it likely won't fit with a 380mm rotor inside 18" wheel. It's possible but not likely.

FWIW, the 991 GT3 runs a 380mm rotor and six-piston Brembo street caliper. It is a close fit, and that is with a 19" wheel.
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Old 03-13-2019, 08:29 PM
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Originally Posted by FrenchToast View Post
Have you measured everything? Unless the caliper is a low-profile motorsport caliper, it likely won't fit with a 380mm rotor inside 18" wheel. It's possible but not likely.

FWIW, the 991 GT3 runs a 380mm rotor and six-piston Brembo street caliper. It is a close fit, and that is with a 19" wheel.
I've used their template on the back for the 356x28 rotors with 6 piston. There was roughly 22mm additional clearance. All else being equal I need 12mm to fit the 380s so I'm hopeful. I'm using apex wheels and they're said to be designed with brake clearance in mind.
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Old 03-13-2019, 08:47 PM
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I was remembering the Cup setup being tighter. It isn't too extreme, but is close.



That's a 380mm rotor and PFC six-piston low profile caliper, with an 18" BBS high-clearance wheel.

You'll just have to watch the wheel weights and leave room for wheel flex (wheels flex under cornering). I've heard of some extreme fitments that are fine static, but rub under cornering.

Curious what calipers you're looking at.
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Old 03-14-2019, 12:02 AM
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Originally Posted by FrenchToast View Post
I was remembering the Cup setup being tighter. It isn't too extreme, but is close.



That's a 380mm rotor and PFC six-piston low profile caliper, with an 18" BBS high-clearance wheel.

You'll just have to watch the wheel weights and leave room for wheel flex (wheels flex under cornering). I've heard of some extreme fitments that are fine static, but rub under cornering.

Curious what calipers you're looking at.
Wheel flex and clearance of weights shouldn't be an issue, just diameter. The Apex wheels I'm using are both rear wheel fitment due to the widths I'm using. 11" front and 12" rear with 295/30 and 315/30. I'm looking at Cieka calipers and rotors.





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