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Our rear rotors always retain OE's drum brake (in blue) while Porsche owners seem to be more intelligent than other communities (eg. Jeep, Hellcat etc.) in the concern of the rear drum brakes.
However due to the rotor diameter is only 322mm so some pad modification may be required in order to accommodate the drum brake 180mm ID.
Although the design is up but since some customers may find it (pad mod.) unacceptable so the production is still pending.
I joined from the forum that "Racing"Brake cross-linked to ask this question:
Is it wise to trust one's life and property to a company that openly insults potential customers and doesn't respond to questions about the design or origin of its products? I think any track enthusiast regardless of the brand they drive would make the same decision.
However due to the rotor diameter is only 322mm so some pad modification may be required in order to accommodate the drum brake 180mm ID.
Although the design is up but since some customers may find it (pad mod.) unacceptable so the production is still pending.
What kind of modification would be necessary? Relatively easy?
I joined from the forum that "Racing"Brake cross-linked to ask this question:
Is it wise to trust one's life and property to a company that openly insults potential customers and doesn't respond to questions about the design or origin of its products? I think any track enthusiast regardless of the brand they drive would make the same decision.
Cheers!
ya just read the actual post ... not a good look. But hey, engineers aren't known for their marketing expertise or eloquence, so as long as the product actually works...(or until such time Girodisc releases a matching rear rotor)
What kind of modification would be necessary? Relatively easy?
Drawing showing tight space for hardware to accommodate between a drum brake (180mm) and a smaller rotor dia. (322mm) with OE pad depth, and the possible interference (in yellow) with brake pad bottom (outboard side).
Brake pad depth=51mm, so it may require to trim 2-3mm (Only outboard pads x2 need trimming) at the bottom to clear the hardware when the pad wears down.
If the 322x28 rears need a few mm shaved from the outboard pads, are the non-turbo 299x24 rears feasible or not? Shaving 2-3mm from the rear outboard pads wouldn't bother me a bit.
For what it's worth, I had my hydraulic brake boost (964 C4/turbo system) run out of pressure from a random bad connector wire at an autocross. No brake boost and the pedal was suddenly rock solid. The handbrake was the only thing that saved me from saying hi to a visit into the trees at 60mph. I think your approach of using an iron brake shoe liner, instead of just the aluminum hat inner diameter, is a winner.
Edit: for the record, I got these weights for OE rear rotors
16.2lbs 964 299x24
15.2lbs 968 M030 299x24, same as 964 except are "drilled"
14.2lbs 993 299x24 Meinle brand "drilled", 29.0mm shorter hat than 964 due to hub difference
For a 299mm rotor with OE drum brake retained your brake pad is constrained to (299-217)/2 =41mm, so if you can manage the pad depth to be @38mm the rotor can be made available.
Very valuable experience to share on the need of rear emergency brakes. In fact when we developed our composite rear hat (aluminum shell with iron sleeve insert) some 10 years ago, it was field tested by a Camaro SS G5 track driver running in COTA, he used only the rear drum brake (no foot brake) to slow down the car.
We are proud of this successful development which has helps hundreds of track enthusiasts shaves some 4-6 lbs per hat/rotor plus better heat dissipation vs. OE's stainless steel hats for CCB rotors and iron hats like Nissan GTR rear two piece rotors.
For a 299mm rotor with OE drum brake retained your brake pad is constrained to (299-217)/2 =41mm, so if you can manage the pad depth to be @38mm the rotor can be made available.
Very valuable experience to share on the need of rear emergency brakes. In fact when we developed our composite rear hat (aluminum shell with iron sleeve insert) some 10 years ago, it was field tested by a Camaro SS G5 track driver running in COTA, he used only the rear drum brake (no foot brake) to slow down the car.
We are proud of this successful development which has helps hundreds of track enthusiasts shaves some 4-6 lbs per hat/rotor plus better heat dissipation vs. OE's stainless steel hats for CCB rotors and iron hats like Nissan GTR rear two piece rotors.
Good so it looks like trimming is not an issue for you guys although we still like to disclose it and make prospective buyers aware of the require modification.
If we can have 10 people sign up for pre-orders, we will provide a coupon code with 10% discount for you to per-order - Details will be announced later but for now add your vote to the poll.
I’m very happy with your front 304x32 rotors. Hoping you’ll make a rear 299x24 for the 964 someday.
So far we have 6 members interested in the car set (including the rear), I wonder if you can consider adapting to 322x28 in the rear so we can count you in as #7
02-22-2021, 06:12 PM
Light Wt Two Piece Rotors for 993TT
