Brake Pads...technical
#1
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Brake Pads...technical
I need to replace my brake pads..Castle Combe on Saturday saw the end of my rear pads, and the end of my track sessions unfortunately.
Anyway, I've always used Porsche pads, but I'm thinking of trying something more track-oriented.
Pagid Yellow seem to be a good choice, and I've looked up the technical spec (see below) but this has lead me to a few questions...
RS 19 – YELLOW Friction Level Cold 0.40
At 100°C 0.43
At 300°C 0.47
Max 0.49 @ 550°C
Constant working temperature 400 - 700°C
Max temperature for short period only 750°C
1. I assume that the higher the number (ie closer to 1.0) the more friction, therefore better stopping?
2. How does the friction level translate to pedal feel/stopping distance. (If at all)
3. What would the same specs be for Porsche pads?
Anyway, I've always used Porsche pads, but I'm thinking of trying something more track-oriented.
Pagid Yellow seem to be a good choice, and I've looked up the technical spec (see below) but this has lead me to a few questions...
RS 19 – YELLOW Friction Level Cold 0.40
At 100°C 0.43
At 300°C 0.47
Max 0.49 @ 550°C
Constant working temperature 400 - 700°C
Max temperature for short period only 750°C
1. I assume that the higher the number (ie closer to 1.0) the more friction, therefore better stopping?
2. How does the friction level translate to pedal feel/stopping distance. (If at all)
3. What would the same specs be for Porsche pads?
Last edited by robmug; 11-06-2006 at 02:00 PM.
#2
Banned
Hi Rob,
Sorry - but I don't have experience with Pagid Yellow compound - but I do with the newer Pagid "S" and previously, Pagid Orange... The orange is terrific for track only use, but I wouldn't recommend them for daily driving. they are also very aggressive on the rotors (or so my experience?). The "S" compound isn't as aggressive as the Orange, but - with them - I've never experienced any fade.
I've also used Porterfields - but not on the street (unless you like HUGE amounts of SQUEEEEEELL!!! and since the 964 C4 is Jen's "daily driver" after the track, she had a "few words" about the pads ). For street - I'm running Jurid (both the 964 & the 993) - and then change the pads over for track when I do a bleed before the event?
Anyway - I guess it largely depends on your driving style, and whether your 964 is track only - or a combination of track/street??
As for pedal feel?? Hmmm - before the Pagids/Porterfields warm up - the pedal does seem "harder" to have the same braking effect (i.e. - pushing harder with cold rotors/pads).
HTH,
John D.
Sorry - but I don't have experience with Pagid Yellow compound - but I do with the newer Pagid "S" and previously, Pagid Orange... The orange is terrific for track only use, but I wouldn't recommend them for daily driving. they are also very aggressive on the rotors (or so my experience?). The "S" compound isn't as aggressive as the Orange, but - with them - I've never experienced any fade.
I've also used Porterfields - but not on the street (unless you like HUGE amounts of SQUEEEEEELL!!! and since the 964 C4 is Jen's "daily driver" after the track, she had a "few words" about the pads ). For street - I'm running Jurid (both the 964 & the 993) - and then change the pads over for track when I do a bleed before the event?
Anyway - I guess it largely depends on your driving style, and whether your 964 is track only - or a combination of track/street??
As for pedal feel?? Hmmm - before the Pagids/Porterfields warm up - the pedal does seem "harder" to have the same braking effect (i.e. - pushing harder with cold rotors/pads).
HTH,
John D.
#4
Pagid Yellow seem to be a good choice
1. I assume that the higher the number (ie closer to 1.0) the more friction, therefore better stopping?
#5
Rennlist Member
I would toss in a recommendation for Performance Friction pads...either the 97 or 01 compound...They are terrific pads...no material transfer,easy bed in procedure and kind to the rotors...I have used 'em all and these pads are my favorite...They are as costly as the Pagids however.
#6
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RS-19s get my vote. In difficult applications (poor cooling, small brakes, heavy car) they have been the only pad that has consistantly worked well.
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Larry Herman
2016 Ford Transit Connect Titanium LWB
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Retired Club Racer & National PCA Instructor
Past Flames:
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Larry Herman
2016 Ford Transit Connect Titanium LWB
2018 Tesla Model 3 - Electricity can be fun!
Retired Club Racer & National PCA Instructor
Past Flames:
1994 RS America Club Racer
2004 GT3 Track Car
1984 911 Carrera Club Racer
1974 914/4 2.0 Track Car
CLICK HERE to see some of my ancient racing videos.
#7
Still plays with cars.
Lifetime Rennlist
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Robmug - the specs for the RS 19 yellow show that they have good friction when cold and a little more when hot. A street pad would should a higher friction level when cold (around 0.45 or so) but less friction when hot.
Street pads are designed to have good friction at sub zero temps when the pads and rotors are stone cold. To do this they have to compromise on the high temperature friction. In fact at high temps the pads will melt and form a glazed surface which has very low friction. Race pads like the RS 14 are the opposite, they will have next to no friction when cold and a lot when they are blazing hot. They are also harsh on rotors as John observed. The RS 19 and the slightly newer RS 29 are endurance racing pads which work well on the street at any temp above 40 degrees or so. They are an excellent choice for DE as they last long and do not grind down your rotors.
Best,
Street pads are designed to have good friction at sub zero temps when the pads and rotors are stone cold. To do this they have to compromise on the high temperature friction. In fact at high temps the pads will melt and form a glazed surface which has very low friction. Race pads like the RS 14 are the opposite, they will have next to no friction when cold and a lot when they are blazing hot. They are also harsh on rotors as John observed. The RS 19 and the slightly newer RS 29 are endurance racing pads which work well on the street at any temp above 40 degrees or so. They are an excellent choice for DE as they last long and do not grind down your rotors.
Best,
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Rob
Pagid blues stop my car on a six pence, but they are very heavy on the discs.
I get a lot of scoring and disc deposit when I've had a session on track, this takes a while to get rid of on the way back from the track.
I've heard a lot of good reports about the ebc yellows, at nearly a third of the price of the pagids (£50 vs £150 per axle) I'll give these a go after the blues are shot.
Rob
Pagid blues stop my car on a six pence, but they are very heavy on the discs.
I get a lot of scoring and disc deposit when I've had a session on track, this takes a while to get rid of on the way back from the track.
I've heard a lot of good reports about the ebc yellows, at nearly a third of the price of the pagids (£50 vs £150 per axle) I'll give these a go after the blues are shot.
Rob
#10
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Thread Starter
Interesting - 2 posts about EBC. I'd previously heard that the EBC pads were hopeless...I don't think the comments referred to the Yellows though...and I'm a little put off by the Max Power image of the EBC range...am I wrong?
#11
Three Wheelin'
Originally Posted by robmug
Interesting - 2 posts about EBC. I'd previously heard that the EBC pads were hopeless...I don't think the comments referred to the Yellows though...and I'm a little put off by the Max Power image of the EBC range...am I wrong?
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Rob
Agree on the maxy power image, but on a recent day a friend had them on a 3.2cs and hardly had any dust on his wheels. No issues with braking performance either.
Ask at your local gsf for prices, (say your trade for the best price)!
asaik - grn = road pads, red = semi road/track, yellow = more track orientated.
Rob
Agree on the maxy power image, but on a recent day a friend had them on a 3.2cs and hardly had any dust on his wheels. No issues with braking performance either.
Ask at your local gsf for prices, (say your trade for the best price)!
asaik - grn = road pads, red = semi road/track, yellow = more track orientated.
Rob
#14
You can get a better feel for what a pad will be like from looking at this chart from BT of America(Pagid N.A.)
again you want a nice flat linear response across as large a temp regime as you can get
tires will always be the limiting factor
race pads are for race use where nice sticky tires are used.
again you want a nice flat linear response across as large a temp regime as you can get
tires will always be the limiting factor
race pads are for race use where nice sticky tires are used.
#15
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Originally Posted by Bill Verburg
tires will always be the limiting factor
race pads are for race use where nice sticky tires are used.
race pads are for race use where nice sticky tires are used.