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Porterfield R4-S Pad Review

14K views 28 replies 14 participants last post by  JimLill  
#1 ·
Well, after driving on the pads for the past 5k I figure I would post a little feedback for those that are potentially considering new ones.

Now, I have to say this first. I have been driving with only Takspeed Ti shims between the piston and the pad. I haven't applied any grease between any of the contact areas ever! I also had the rotors turned when I replaced them (had slight shudder from 90-60). The bedding was 3X 40-10, 60-20, and 90-30 with cool downs in between.

Do you want the good news or bad news first????? Ok, I'll give the good news first.

These are a good set of pads! They are better than I expected when cold and while upon rolling to my first stop, I haven't noticed anything much different than stock. I've never been in for any surprises and, although I've never had any events to be surprised, they perform as predictably as a street pad can.

Ok, better news.....

These are trully a low dust pad. I've seen, for example the Hawk pads claiming low dust and whatnot. But real world scenarios have shown me otherwise as I believe the stockers and Hawk HPS dust a bit more than these.

Ok, now the great news....

The Porterfields only get better when warmed up. After some spirited driving, the car wants to stop much more than than cold. Compared to stock, they really bite, and I mean that in a good way. I barely touch the brakes at slow speeds and the car really stops quick or just plain stops. High speed braking is great and feels as such a pad should deliver. Note: I haven't had any track time with these pads yet, all street driven (drove many laps with stockers)

Ok, now for the bad noise.....I mean news.

These things screach!!!!! Anything from 5 mph to 0 will produce an unearthly noise. I must admit, at first I didn't mind because I knew they were performance pads, but it gets annoying when youn are around town. Once the pads get warm or hot, the noise only grows.....like a monster. Anyways, this is the only negative to this pad in my configuration (pad-Ti-piston, no grease)

Overall, I think its an awesome pad matched with the stock calipers and disks. I only wish they were a bit more quiet, but beggers can't be choosers as I wanted a high performance pad that was better than stock and didn't care about noise at the time. All said, this weekend I will pull them and then apply a high temp grease to see if it helps. It should help, but I jsut wanted to post my before opinion as there is nothing but titanium between the piston and pad at the moment.

Happy reading!
Kevin
 
#2 ·
Re: Porterfield R4-S Pad Review (KVB-R)

Are the leading edges of the pads chamfered? If they haven't been rounded you might want to knock the corners off to avoid some chatter potential. Definitely apply pad compound to the backs and the shims too.

Tom.
 
#4 ·
Re: Porterfield R4-S Pad Review (tmtalpey)

Quote, originally posted by tmtalpey »
Are the leading edges of the pads chamfered? If they haven't been rounded you might want to knock the corners off to avoid some chatter potential. Definitely apply pad compound to the backs and the shims too.

Tom.

Yes they are rounded. I will fully grease them (carefully) to see the difference and impact of greasing the pads with these shims.
 
#6 ·
Re: (whoosh)

Quote, originally posted by whoosh »
What about disc wear? Have they been kind to your rotors?

Disk wear is impossible for me to determine. I had the rotors turned at 15k along with installing new pads...It took about 3k before the turning grooves completely wore through on the fronts, and the rears just recently became smooth. So I guess the disk wear average???????
 
#7 ·
Re: (KVB-R)

Quote, originally posted by KVB-R »
I had the rotors turned at 15k along with installing new pads...
Ohhhhh. Could be part of the issue. The metallurgy, and the resulting surface finish have changed. Also, if you took off more than a sliver of material, the calipers are extended further, this can cause movement and resulting harmonics. But, it could be someting else.

Tom.
 
#8 ·
Re: Porterfield R4-S Pad Review (KVB-R)

Thanks for the R review. I have been a LONG time Porterfield user and swear by them. They do all the things you say they do and they ARE rotor friendly. I used to get around 50,000 miles out of a set of pads and rotors on my Benz. She was on her third set when I sold her.

Unfortunately, it may be too late for me to help you with the screeching, although a chamfered edge is always recommended as noted above. You can try the anti-squeal compound ... at this point it may be your best alternative.

This product is to be used when pads are new and rotors are new or freshly turned. All the Benz guys used this stuff with great sucess. The squealing was sporatic on our cars too ... some did and some didn't. However I think everyone who used this product agreed that no squealing would occur if this was used upon installation:

http://www.stopbrakenoise.com/

Image


... not expensive, easy to apply, and it works. We used the GWR Brakesoap to clean the rotors and then applied the silencer ... about 20 bucks.

Modified by Quick Brick at 9:07 PM 8-25-2006
 
#9 ·
Re: (tmtalpey)

Quote, originally posted by tmtalpey »
Ohhhhh. Could be part of the issue. The metallurgy, and the resulting surface finish have changed. Also, if you took off more than a sliver of material, the calipers are extended further, this can cause movement and resulting harmonics. But, it could be someting else.

Tom.

Though I only had the disks turned to true them and didn't have them scraped. I don't think the piston extension is an issue, plus there was alot more pad in the the ones than the old stocks. These have only gotten noisier as the disks wore smooth, if you know what I mean.

I've read that you should never bed new pads with new disks (or turned disks) and opp. and perhaps this was a mistake on my part..... I'll have to try my next set on well used pads or disks.....

Kevin
 
#10 ·
Re: Porterfield R4-S Pad Review (Quick Brick)

Quote, originally posted by Quick Brick »

Unfortunately, it may be too late for me to help you with the screeching, although a chamfered edge is always recommended as noted above. You can try the anti-squeal compond ... at this point it may be your best alternative.


Why might it be too late? Is there no chance if I pull the pads, round the leading edge if need be, and add some grease (I know, not just any grease)?

I purposely installed these the way they are just to see one extreme, is there a chance I might see another?

Kevin
 
#11 ·
Re: (KVB-R)

Quote, originally posted by KVB-R »
I've read that you should never bed new pads with new disks (or turned disks) and opp. and perhaps this was a mistake on my part.....
I'm not sure I follow this. What happens when a car rolls off the assembly line? Have the disc and/or pads been bedded already?
Image
 
#12 ·
Re: Porterfield R4-S Pad Review (JimLill)

Quote, originally posted by JimLill »
I ran a set on both road and track and agree with all the good..... I did not have any screech...


Did you do anything different that may have helped prevent the screech? Did you grease the pads (and do you think that will/would make a difference)? (I have no experience with doing pads myself, so excuse the ignorance, but I do intend on doing my own brake job on my V70R when it is eventually needed. )

Thanks,
Albert
 
#13 ·
Re: Porterfield R4-S Pad Review (KVB-R)

Quote, originally posted by KVB-R »


Why might it be too late? Is there no chance if I pull the pads, round the leading edge if need be, and add some grease (I know, not just any grease)?

I purposely installed these the way they are just to see one extreme, is there a chance I might see another?

Kevin

Because as I stated, the product as I know it is meant to be used on new or fresh componenets. It sure wouldn't hurt to call those folks and ask them. They were very helpful trying to find a Porterfield solution for the guys on my other board. Just explain your situation and maybe they can recommend a product or 2 for you to try.

Modified by Quick Brick at 9:08 PM 8-25-2006
 
#14 ·
Re: (KVB-R)

Quote, originally posted by KVB-R »
Though I only had the disks turned to true them and didn't have them scraped. I don't think the piston extension is an issue, plus there was alot more pad in the the ones than the old stocks. These have only gotten noisier as the disks wore smooth, if you know what I mean.
How do they true them without removing material? Well, I guess it could be any of several things, maybe more than one combining even. See what happens when you add the grease. Be sure the opposite contact surfaces are clean too.

Any chance these pads are directional? Just another idea.

Tom.
 
#15 ·
Re: Porterfield R4-S Pad Review (adalcanto)

Quote, originally posted by adalcanto »
Did you do anything different that may have helped prevent the screech? Did you grease the pads (and do you think that will/would make a difference)? (I have no experience with doing pads myself, so excuse the ignorance, but I do intend on doing my own brake job on my V70R when it is eventually needed.

I have never had a squeal issue with any street pads on my car. The Track only PFC90 are noisy as can be.

When I installed the R4S I added a little front and rear edge taper, and was very careful how I bedded them.

If you have squeal, on any pad, I recommend removing them, flat sanding them, and re-bedding

Image
 
#22 ·
Re: Porterfield R4-S Pad Review (blot)

Quote, originally posted by blot »
Jim, since you have used both PFC97s and Porterfields, which one performs better on the track in terms of braking power? Assuming rotor wear is not a concern.

Just to clarify:

The Porterfield R4-S is rated as a high performance street pad. I'd be more inclined to compare the PFC97's to Porterfield's R4 (track only) pad. We have the below desciptions on our website to help our customers decide between the two Porterfield variants available:

R4-S: High Performance StreetDesigned specifically for high performance and heavy-duty street conditions. These brake pads are perfect for everyday street use, but also capable of tolerating the most severe street use without any brake fade. The R4-S friction level will offer increased stopping ability with minimal pedal effort, while remaining rotor-friendly. The R4-S compound has the absolute lowest noise and dust levels than any other high performance brake pad. Good for performance street, autocross, and mild track use.

R-4: Full Race Compound
Designed specifically for heavy-duty motorsports. The carbon based semi-metallic R-4 materials allow the pad to absorb tremendous amounts of heat and dissipate it at very even rate. Carbon Kevlar material warms up to race temperature quickly, which is quite helpful during restarts, and when track time is limited. When used with cast iron and steel alloy rotors, the R-4 compound requires minimal bed-in period. Throughout the entire heat range, the carbon kevlar material will give extremely consistent modulation and predictably. This is truly the most rotor friendly racing brake pad material ever. Good for road courses, oval track, rally, vintage racing, autocross, club events or professional racing events.

http://www.vivaperformance.com...id=42
 
#24 ·
Re: (c70Pete)

I just tracked a set of Hawk HPS pads. They were nice and grabby with a little fade at the end of a 20+ minute session. I was having trouble with getting the fluid too hot but longer cooldown laps and a flush with fresh synthetic DOT 4 seemed to solve it.

Curious: my calipers are now permanently discolored - would the titanium shims have prevented this?
 
#25 ·
Re: (sberry)

Quote, originally posted by sberry »

Curious: my calipers are now permanently discolored - would the titanium shims have prevented this?

Perhaps, I've done 300 track miles and all of them with another R ownr for comparison, but it was noticeable how my calipers were consistantly cooler after numerous laps than his.

Two different drivers though, so that means two different braking tendacies.

Kevin