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78/79 Floating Rotors

Porsche used this on the 78/79 930 and it was Porsche's first attempt at a race car brake setup to be used in a production car. After a great many problems with cracking and heat expansion they used splines to attache the rotor to the hub. Porsche stop using them in 1980 due to the extreme cost of manufacture. As a result a TSB was put out to change all floating rotors to a solid rotors which were much easier to manufacture. I'm not sure how many still have floating rotors but they are quite special. They are a direct link to Porsche's racing past.








Last edited by tonypeoni; 02-20-2014 at 03:38 PM..
Old 02-20-2014, 03:34 PM
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Cool pictures. Nice to see those brakes all side by side for comparison.
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Old 02-20-2014, 04:09 PM
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What's the benefit of the floating rotors over the later solid design? Are the floating rotors and the solid ones interchangeable?
Old 02-20-2014, 08:59 PM
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"Extreme cost of manufacture" Are you joking? They took them off because they stick in the everyday world. When the disk doesn't slide any more the braking is greatly reduced.
Old 02-21-2014, 03:07 AM
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I'd also submit that the full floaters are noisy as hell. It's nearly unbearable on my '79 when driving on the street. I bet that the doctors and lawyers who bought these cars new were pissed off that their expensive luxury rocket ships had such noisy @$$ brakes.
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Old 02-21-2014, 03:25 AM
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awesome pics

phew, good thing you've posted it 2x in as many weeks now...
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Old 02-21-2014, 04:58 AM
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Quote:
Originally Posted by jwasbury View Post
I'd also submit that the full floaters are noisy as hell. It's nearly unbearable on my '79 when driving on the street. I bet that the doctors and lawyers who bought these cars new were pissed off that their expensive luxury rocket ships had such noisy @$$ brakes.
The nosie is like the sound of freedom from a jet fighter

The original ‘78/79 front brakes are very close in design to the 3.0 RS/RSR. There were many parts (…expense) and along with the increased noise probably drove Porsche to replace them with one piece units. I would agree they provide minimal benefit for the street but they are vital for racing which is why they were fitted to 3.0 RS/RSR as well as the 934’s/935’s of the time.
Old 02-21-2014, 05:05 AM
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Ask any Porsche tech from back in the day. They got stuck on the shaft after awhile in sime cases. Not arguing that they aren't racey.
Old 02-21-2014, 05:20 AM
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Quote:
Originally Posted by Speedy Squirrel View Post
Ask any Porsche tech from back in the day. They got stuck on the shaft after awhile in sime cases. Not arguing that they aren't racey.
Yep, no doubt, high maintenance...this is why so many are replaced today.

I would bet the stock production 1975 930 Turbo at the 1975 Le Mans would have placed in the top ten if it would have been equipped with floating rotors (brake discs change costs them many hours but still finished in 15th place).

Last edited by rlane930; 02-21-2014 at 05:41 AM..
Old 02-21-2014, 05:39 AM
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