nine64

my car have small 2 piston brake caliper at the rear. The question is should i spend the money and upgrade to 4 pot at the rear or should i go big red at the front only and leave the rear stock? idealy would like to upgrade all 4 to big red but have limited budget.

thanks
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scupper

Depends . . . . . . what are your plans for the car? Unless you intend to get into serious racing, I would not bother with the big reds. The stock brakes are more than adequate for steet and most DEs. The rear upgrade to larger calipers is a nice mod.

You might want to try different pad compounds if you feel your brakes are not doing their job. I have drilled rotors, and recently went from stock pads to Metal Masters (to cut down on dust) and on to Perfornance Friction compound 97. Although the PF97 generate more dust, they appear to really stop the car with a minimum of brake effort. I am running in a Drivers Ed event tomorrow, Monday, at Summit Point and am looking forward to see the difference with the PF97s.

By the way, feel like a bit of a ricer - the PF97 doe not need drilled rotors, but the rotors look neat!

Chuck
93 C2

Bill Gregory

Agree with Chuck - depends on what your needs are. Track vs street? Looks? Is there a problem you want to address? You certainly can upgrade the rears to the 4 piston calipers - you should be able to find the 4 piston calipers used at a reasonable price, as people take them off when making brake upgrades. I would not, however, upgrade the fronts to big reds without, at a minimum, upgrading the rears at least to the 4 piston C4/92+ C2 caliper, and better yet, upgrade the rears to red at the same time. Regardless of street/track usage, you want your brakes to be balanced.

Also, with our 964's reaching 10+ years, consider replacing the rubber brake hoses. The hoses can start to swell up internally after around 10+ years, which can affect the hydraulic operation of the brakes (There's a picture in Bruce Anderson's "Porsche 911 Performance Handbook"). In front, the 964 hose is superceded with the 993 hose. Rear, I believe, is a 911 numbered part. Unless you'd be inspecting your brake/hub area often, I don't recommend stainless mesh-covered brake lines - current factory racers use rubber lines.

nine64

thanks, i think my is mostly spirit driving and look i think what i will do is find a use rear 4 piston caliper and change my disc to drill one. thanks for the tip about changing the brake hose, i better look into it and see what up in there.
do you have the part no. for the rear brake caliper? where should i check for a use one? do i need to change anything eles when i updated to 4 piston brake at the rear? about the brake pad what brand do you guy recomend.
thanks

tenn

Christer

Tenn

This has only recently come up in a discussion - use the archives. I have the 4 pot rear, and did not change anything other than the calipers and the pads. You can happily use the same disc/rotor. I also use the same PV valve although this was discussed at length in the last thread.

nine64

thanks christer, i found the thread. i think i just change the rear caliper. you know where i can find a use one? most have the big break upgrade. I am all the way in Thailand, so some place i can order online,
thanks
tenn

Bill Gregory

If you were to order new, left rear caliper is 928.352.421.03 and right rear is 928.352.422.02. You probably already know about your country's Porsche dealer in Bangkok - the link to their web site is here.

Christer

Tenn

I stumbled across someone on Rennlist who happened to have some that came off a car that had been upgraded. I would try http://www.porsch-apart.co.uk/parts.cfm

Good luck

scupper

Well, I am happy to report back from my first DE using Performance Friction 97s - - in a word, WOW! This was my first experience with a racing pad - previously I used stock pads, then a carbon street pad, then Metal Masters (to eliminate dust, lazy me!) and now the PF97s. Nothing has EVER provided the stopping power of these pads. Braking at Turn 1 and at Turn 5 (bottom of Chute) was just phenomenal - I could go deeper into the turn before braking. I'm a convert!

Chuck
93 C2

joey bagadonuts

That's great news, for me. I just installed a set of PFC97's Saturday in preparation for one last trip around Road America this upcoming weekend. There are three long straights which can end in the 140-150mph range so it's good to hear I'm working with a quality set of pads. Thanks for sharing!

andrew911

By the way, I just got my PCA magazine in the mail, and there is a Porsche dealer here in the US advertising big red brake kits for $1,200 (set of 4). I don't know if that's a good price, but its from a Porsche dealer, so at least the seller should be reputable (although I live in NJ and have never done business with these guys, I have heard of their name).

Here's the info:
Brumos Porsche
1-800-726-9155
parts@brumosporsche.com
10211 Atlantic Boulevard
Jacksonville, FL 32225

scupper

Joey - the only disconcerning thing with the PF97s is the initial braking in the morning as I tootle off to work - it's like there are no brakes - - after one or two applications to get heat into the pads, they are fine.

Chuck

nine64

thanks for the tips guy, i found the caliper in Hong Kong (Design911 shop inHK). So i will get cross drill disc as well. I don't do any track day, still ok to use the pad u mention?

tenn

Bill Gregory

Make sure the 'cross drilled disc's' are made with cast-in holes and are not actually drilled. Those made for Porsche and several of the OEM to Porsche use the cast-in method where the holes are, well, cast in during the manufacturing process. Drilling generally creates stress risers that will cause cracks to form between the holes, which ruins the rotor much quicker than the cast-in variety. The cast-in variety will eventually get the same cracks, just nowhere as quickly.

joey bagadonuts

Thanks, Chuck, for the heads up. I've used race pads around town before so I know that slick, "Hey, why doesn't this d#mn thing stop?" feeling.

Tenn,
The PFC97's are probably not a good choice for street use. OEM pads should provide excellent results with the new brake system. I've also had very good experience with the Ferodo Premier pads for everyday use, i.e. low dust, good friction, low noise.