Switch to Pagid Yellow
07-28-2010, 09:22 AM
#31
Rennlist
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Darrell, the Pagid Orange pads are a very old compound, and not really designed for the higher brake temps that we routinely see, especially with stock calipers and sticky tires. Most people have problems with them chunking and pulsing. My son has run the Oranges successfully in his 951, but that has big calipers and has brake cooling ducts fitted. The RS-19 Yellow pads are the ones to run.
__________________
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.
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.
07-28-2010, 01:45 PM
#34
Brake pads "chunk" when the binder that holds the material all together fails under excessive heat and that same level of heat accelerates pad & rotor wear.
There are many reasons this can happen that include:
1) Wrong choice of pads.
2) Insufficient cooling.
3) Braking technique.
4) Insufficient rotor mass to dissipate the accumulated heat. This is exacerbated with additional grip of DOT-R type tires that puts a LOT more thermal stresses on the brake system. Using larger rotors (with matching calipers) reduces operating temps.
When the front brakes show heat stress while the rears look good, indicates too much front brake bias and that can be aleviated in several ways. One easy way is by using different pad compounds on the rear.
Your brake "engineer" is supposed to help you choose the appropriate pad for ones' application, taking into consideration your tires, vehicle weight, power, track configuration, what kind of cooling you have (if any), rotor and caliper setup, and driver skill levels. Its oftentimes not a "one-size-fits-all solution.
In some cases, measuring peak rotor temps helps one make the correct choice of pads and this is especially important, given the cost of these things,....
There are many reasons this can happen that include:
1) Wrong choice of pads.
2) Insufficient cooling.
3) Braking technique.
4) Insufficient rotor mass to dissipate the accumulated heat. This is exacerbated with additional grip of DOT-R type tires that puts a LOT more thermal stresses on the brake system. Using larger rotors (with matching calipers) reduces operating temps.
When the front brakes show heat stress while the rears look good, indicates too much front brake bias and that can be aleviated in several ways. One easy way is by using different pad compounds on the rear.
Your brake "engineer" is supposed to help you choose the appropriate pad for ones' application, taking into consideration your tires, vehicle weight, power, track configuration, what kind of cooling you have (if any), rotor and caliper setup, and driver skill levels. Its oftentimes not a "one-size-fits-all solution.
In some cases, measuring peak rotor temps helps one make the correct choice of pads and this is especially important, given the cost of these things,....
-td [like most folks, I am my own "brake engineer"]
07-28-2010, 11:50 PM
#37
Rennlist Member
When bedding in Pagids, the first session I usually do a warm up lap and a couple fast laps and then come in. After that the pads are bedded in and ready to go. I've never had any chunking.
07-31-2010, 03:31 AM
#39
Rennlist Member
On my 996 GT3 I went through front rotors rather quickly until I went to cup brake ducts and RS 19 fronts with RS 14 (black rears. As Steve suggests above, the Black pads in the rear improved brake bias and made the rear rotors do more of the work. With 50 odd track days per season, I was able to do a full season on two sets of pads and one set of front rotors. Previously I would go through front rotors in about 12 days!
The rotors needed replacement because of cracks which exceeded the spec.
The rotors needed replacement because of cracks which exceeded the spec.
Last edited by inverterman; 07-31-2010 at 03:32 AM. Reason: Posted wrong quote
