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brake pads

Gents opinions on these :
porterfield r4-s pads. carbon kevlar
thanks Sox

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"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 02-11-2020, 10:13 AM
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I use them for light track days and street driving.

More dust than OEM, but not that bad.
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NASA/PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
I can fix your late 944 Cruise Control module - PM for details
Old 02-11-2020, 01:05 PM
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Thanks KD,
Does the dust stick and cause a squeal ?
Sox
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"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 02-11-2020, 07:58 PM
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My brake pads are getting to the point of replacement. After talking to Zeckhausen he recommended Ferodo DS2500 race pads but at $233 front I wanted something cheaper. Car is just street driven. He then suggested that I try a set of Stop Tech since they are very inexpensive comparably. Don't know if you are in that same situation. But these are the pads he suggested.

StopTech 309-series Sport brake pads

Thanks
Mike G.
Old 02-12-2020, 07:52 AM
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Very little squealing with RS-4's, and not hard on rotors. Probably the best pad for street with a bit of track days thrown in.
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NASA/PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
I can fix your late 944 Cruise Control module - PM for details
Old 02-12-2020, 08:23 AM
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porterfield r4-s pads are unbeatable for street use. they have great cold and wet stopping ability and do not squeal as much as other pads. they are also very gentle on your rotors.

on the con side, they do fade quickly at high-speed and do not work well when hot, so they are not good for track use where repeated hard braking is required. for track use the r4 is better. the drawback on the r4 is they need to be warmed up to bite, but that's about the same as the stock or other 'high performance' pads.

i personally use the r4 because once they get over the initial warm-up they work much better than the r4-s and do not fade.
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Old 02-12-2020, 08:37 AM
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Thanks gents
Sox
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"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 02-12-2020, 09:26 AM
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Quote:
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i personally use the r4 because once they get over the initial warm-up they work much better than the r4-s and do not fade.
For street use? I know that it states they are not for street use but I'm sure that's CYA.

Thanks
Mike G.
Old 02-12-2020, 10:52 AM
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R4's squeal like a pig in heat during street driving.

I use them for my track car, however.
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NASA/PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
I can fix your late 944 Cruise Control module - PM for details
Old 02-12-2020, 03:59 PM
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Quote:
Originally Posted by kdjones2000 View Post
R4's squeal like a pig in heat during street driving.

I use them for my track car, however.
My buddy has some HAWK pads, can't remember which ones but he had the same complaint about squealing on the street.


Mike G.
Old 02-12-2020, 05:24 PM
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yep, like most things in life you can't have it all with brake pads. you get either:

1. cold and wet bite with no warm-up and quiet operation while gentle on rotors, but quick fade at high-speed (potentially dangerous) [porterfield r4-s]
-or-
2. you get mediocre cold and wet bite with amazing warm/hot sustained stopping power with no fade, but squealing with light brake use and harder on the rotors (potentially annoying) [porterfield r4]

keep in mind the stock/OEM 951 pads are option 2 only, and among all of the option 2's porterfield is still the best choice.

porterfield is also the best choice among all the option 1's, so it's really a matter of what type of driving you do. for me, i do a lot of high-speed driving so i go with option 2 and live with the occasional squeal knowing my brakes will never fail on me.

i think most other pads try to give you the best of both worlds so they are somewhere in between which means they suck at cold/wet stop and also suck at sustained hot/high-speed use but since most people don't push their cars to the limit they don't notice.
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Last edited by nize; 02-14-2020 at 07:59 AM..
Old 02-13-2020, 08:12 AM
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Originally Posted by nize View Post
keep in mind the stock/OEM 951 pads are option 2 only, and among all of the option 2's porterfield is still the best choice.
Haven't checked my pads but PO was a Porsche parts only guy so assume they are OEM. They do occasionally squeak on soft braking. Thought they might have been hi performance pads because of that. BTW stock pads dust like MAD!! I did have brake fade once going down a canyon in SoCal called Tuna Canyon. I do have some race track experience but that was 25 years ago.


Thanks
Mike G.

Last edited by Mike Goebel; 02-13-2020 at 08:39 AM..
Old 02-13-2020, 08:33 AM
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I tried Hawk Blue based on a friend's suggestion for my track/street 951. never again. they work well on street and track but the dust will bake itself onto your wheels, and plan to order a new set of rotors with each set of pads.

so I went back to what I had used on my 911 for street / track. pagid yellow, not cheap. years ago I tried pagid orange and they have almost no bite when cold, and tended to develop uneven rotor deposits if not kept hot.

good luck.
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Old 02-14-2020, 06:08 AM
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So has anybody tested the Stop Tech 309 pads for dual usage or just street?

Thanks
Mike G.
Old 02-14-2020, 07:14 AM
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here's a nice comparison:
https://www.redpants.lol/blog/2016/11/16/porterfield-r4-vs-r4-s-brake-pad-comparison-part-2
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Old 02-14-2020, 08:28 AM
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If you even consider using the R-4 pads on the street, get some earplugs.

hahahaha

Mike G.
Old 02-14-2020, 08:53 AM
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so......it seems like, stop an squeal is the combo I am looking for. (No deliverance references intended).
Another subject while I was looking at the brake lines, this repair work was done by a shop in Dallas about 15 years ago when I was not doing it all myself. That looks dangerous and it means the piston on that line does not clamp as hard as others due to tube expanding !!
New reminder why I do my own work.
Sox

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"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 02-15-2020, 03:47 PM
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I can't believe it held pressure!!! Those guys should be shot! Not a fuel line???

Mike G.
Old 02-17-2020, 11:27 AM
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Nope its a brake line as far as I can tell.Sox
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"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 02-17-2020, 11:32 AM
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Looks to me like the gas tank evap line....

__________________
NASA/PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
I can fix your late 944 Cruise Control module - PM for details
Old 02-17-2020, 08:06 PM
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