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      02-10-2014, 08:06 PM   #7
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Drives: F82 M4
Join Date: Oct 2006
Location: Chicago

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Originally Posted by URBAN LEGEND View Post
Ok. So what we the improvements? Any compromise for the street?
Originally Posted by stealth.pilot View Post
Do you have any performance data?

How does it affect braking distance?

How does it affect brake dust?

How does it affect brake noise/squeal?

Brake pads in general are a bit of a sliding scale- a pad that performs well on the track will have some unwanted behaviors on the street, and a pad that behaves well on the street will generally not perform perfectly on the track.

With that said, most modern cars (especially ones made by BMW M) are not limited by brake pad when it comes to stopping distance. The original pad will already stop the car as quickly as the tires will allow, or to put it another way, the M5 is limited by tire compound, not pad compound, with respect to stopping distance.

What brake pad manufacturers are typically manipulating when building a high performance brake pad are things like initial bite (the amount of response a pad has when you first apply pressure to the pedal), temperature threshold (the operating temperature of the pad, or how hot the pad can get before the compound no longer functions to slow the car), and brake torque (the amount of overall torque the pad can apply on the disc during braking). Pad wear is also critical in racing, and many manufacturers work hard to develop "endurance" pads specifically for endurance racing, with compounds that are rotor-friendly (do not abuse or excessively wear the disc surface), and last for a very long time in extremely harsh conditions.

With that said, CarboTech offers a host of compounds, and all are available for the F10 M5 now that IND has developed the appropriate pad shapes with CarboTech. The various compounds have different characteristics, and will behave differently with respect to disc life, heat tolerance, etc...

All of the compounds can be viewed at the CarboTech website at the link below, but I will also highlight some of our favorites:

Carbotech™ XP20™
The latest iteration of the highly successful XP™ series of compounds. XP20™ is a step up from the highly successful XP16™ compound. With an extremely aggressive initial bite, linear torque curve and excellent fade resistance the XP20™ is another major step in progression of the highly successful XP™ series line of compounds from Carbotech™. XP20™ has a temperature range of 275°F to 2000°F+ (135°C to 1093°C+). Carbotech™ XP20™ maintains our tradition of having the outstanding release and modulation that has made all other Carbotech™ compounds so successful. Carbotech™ XP20™ is NOT recommended for use as a daily driven street pad due to possible elevated levels of dust and noise.

Carbotech™ XP12™
Another highly successful XP™ series compound with an excellent initial bite, torque and fade resistance over and above the XP10™ compound. XP12™ has temperature range of 250°F to 1850°F+ (121°C to 1010°C+). The XP12™ has that excellent Carbotech™ release and modulation that has made all other Carbotech™ compounds so successful. The XP12™ is more rotor aggressive than XP10™, but compared to the competition the XP12™ is still very rotor friendly. XP12™ is NOT recommended for use as a daily driven street pad due to possible elevated levels of dust and noise.

Carbotech™ XP10™
When Carbotech™ unleashed the XP10™ to the general public it immediately gathered multiple regional, divisional, and national championships. The XP10™ has a very strong initial bite with a coefficient of friction and rotor friendliness unmatched in the industry. Fade resistance is in excess of 1475°F (801°C). XP10™ still maintains the highly praised release, excellent modulation and rotor friendliness that have made all Carbotech™ compounds so successful. Carbotech™ XP10™ is not recommended as a daily-driven street pad due to possible elevated levels of dust and noise.

We typically use the XP12 compound in the front of the F10 M5, and the XP10 compound in the rear of the F10 M5 when disc wear and general mild manners are more important than outright performance. The XP12 and XP10 combination is nearly quiet enough to drive every day, depending on your tolerance for race pads. Many of our track day clients do use these pads daily, but they are of course making their own decision based on their own level of tolerance for a high performance pad.

The XP20 front and XP12 rear combination will provide more overall brake torque and a more aggressive initial bite, with a very slightly faster disc wear. This is a good choice for clients who want the most performance from the M5's brake system, and are willing to have slightly faster disc wear to get there.

Ultimately many will choose to use these pads are they are intended- as track pads that are to be swapped for your original BMW pads at the end of your track day for the drive home. The XP20, XP12, and XP10 compounds have a substantially higher temperature tolerance than the original BMW pads, and will dramatically increase safety in a road course environment.