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Brake FAQ

Old 04-21-2009, 09:58 AM
  #51  
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Where is the rear proportioning valve, I cannot find it in the parts catalogue in any of the related sections.
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Old 04-21-2009, 02:52 PM
  #52  
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I can't find one in the repair manual either, maybe there isn't one after all. The reference was a carry over from another FAQ based on my previous FWD car which had one. Since the RX8 has approximately 50/50 weight distribution they may have been able to handle rear proportioning with the caliper piston diameters and ABS alone. If no one can find one I'll revise the FAQ text.
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Old 04-22-2009, 10:36 AM
  #53  
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I just tracked a set of carbotech xp10 front and xp8 rear with motul 600 at Road america and never experienced fade at any part.

And for those wondering about brake bias, the 8 used EBD, electronically controlled braking bias. It basically will give the rear brakes enough braking power up until just before they lock up so you never have a loose rear end. You can get all 4 wheels to lockup, trust me I've done it on stock pads, but the fronts lock up before the rears to make sure the car is still stable in the emergency stop.

And you do want to make sure your brake fluid reservoir ISN'T completely full as it will make the rear pads drag a little. The rear pads release after the front release if I remember the info correctly. I experienced this and noticed a streak develop across the outer edge of the rear rotors.
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Old 04-22-2009, 11:21 AM
  #54  
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Is this statement at all true about dual rotors?

"They need constant service they are designed 4 racing and the 2 come apart and be re tightened and torqued"

... above was communicated to me from someone that races a lot.
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Old 04-22-2009, 10:36 PM
  #55  
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Originally Posted by rx8thunder View Post
Is this statement at all true about dual rotors?

"They need constant service they are designed 4 racing and the 2 come apart and be re tightened and torqued"

... above was communicated to me from someone that races a lot.
You're referring to 2-piece aluminum hat rotors?
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Old 04-23-2009, 03:08 AM
  #56  
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Originally Posted by rx8thunder View Post
Is this statement at all true about dual rotors?

"They need constant service they are designed 4 racing and the 2 come apart and be re tightened and torqued"

... above was communicated to me from someone that races a lot.
i have not found that to be true.

have been running two piece with alum hats for about 30 k miles. including 5 track days.

are you talking about after changing a rotor on the hat? and checking after?

beers
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Old 04-23-2009, 03:11 PM
  #57  
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I would like to know if anyone has weighed the smaller front caliper and disc from the automatics. Just curious to see if they are significantly lighter.
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Old 04-23-2009, 03:43 PM
  #58  
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Porterfield makes Cermaic brakes and they all go up to 1400 degrees including the R4

Been using them for years. I still have a pair of the first lot they made for the RX8 in the garage. Slight used good for street but I like new pads for the track.
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Old 04-23-2009, 03:46 PM
  #59  
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Originally Posted by swoope View Post
i have not found that to be true.

have been running two piece with alum hats for about 30 k miles. including 5 track days.

are you talking about after changing a rotor on the hat? and checking after?

beers
Racing Brake claims you don't have to re-torque their rotors.

They have special designed harware.
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Old 04-23-2009, 03:48 PM
  #60  
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Originally Posted by justjim View Post
No it wouldn't. The base caliper pistons and the rear proportioning valve will have been sized for the smaller base rotor. Even if the larger rotors physically fit on the brackets (unsure) you will have degraded the brake bias front to rear and the car will not stop as quickly as it would have with the base rotors. You would have to replace the front rotors, front caliper, master cylinder, and rear proportioning valve and possibly the ABS unit to get it to function as the sport GT system.
They won't fit on a 16" wheel.
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Old 05-08-2009, 12:43 PM
  #61  
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bump for stickage^^
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Old 05-08-2009, 11:05 PM
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Originally Posted by justjim View Post
bump for stickage^^
working on it..

btw,

chatted with tom today at colbalt. to funny.

beers
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Old 05-10-2009, 12:14 PM
  #63  
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Hmmm weird that I never seen this but SUBSCRIBED
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Old 05-10-2009, 12:16 PM
  #64  
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I would say that drilled and slotted still look sexy and worth the money if you need to replace rotors...you can always just get slotted if your afraid of cracking with the drilled holes
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Old 06-07-2009, 01:53 AM
  #65  
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thanks for the info on bedding in properly!
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Old 07-06-2009, 08:45 AM
  #66  
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hey guys what about the mazdaspeed brake pads are they any good??? i wanted to get some soon
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Old 07-07-2009, 12:23 PM
  #67  
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Originally Posted by Gozza_11 View Post
hey guys what about the mazdaspeed brake pads are they any good??? i wanted to get some soon
i like em.
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Old 07-08-2009, 06:23 AM
  #68  
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thanks dondo, since were on the topic of MS is there exhaust any good aswell. im thinking of mazdaspeeding my whole rx8 lol
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Old 07-08-2009, 08:47 AM
  #69  
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Please start another thread if you have questions other than brake background.
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Old 07-09-2009, 08:17 AM
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i have already asked these questions in the threads there suppose to be in but no 1 freaking reply's???
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Old 07-09-2009, 12:22 PM
  #71  
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you can pm me about ms stuff if you want
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Old 07-26-2009, 11:29 AM
  #72  
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Carbotech no longer makes any of the panther series pads. The panther pads have been replaced by the bobcat 1521 and AX-6 compounds.

I believe Mazdaspeed now sells the AX-6 but I am having a hard time finding a place that sells the bobcat pads.

From what I have read so far the AX-6 seems like a Great pad. I would like to see reviews of the bobcat.
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Old 07-27-2009, 09:18 AM
  #73  
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Go to the source, call Carbotech at 1-877-899-5024 and order them direct from the factory and you will be able to speak with knowledgeable people. Tell them Jim Dozier referred you (maybe they will give me a discount on my next order) go to the Carbotech website at www.ctbrakes.com for more info on their current pads. Carbotech Bobcat 1521s are still available.
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Old 07-27-2009, 09:49 PM
  #74  
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I know the panther series was at one time available ( but no longer widely accessible. ) and was just trying to list what was currently offered that seemed like a good compromise as far as comparable pads mentioned earlier in the post. I would love to hear more from some one that has used there newer compounds from Carbotech for a bit of time on the street.
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Old 08-04-2009, 02:03 AM
  #75  
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Originally Posted by justjim View Post
Comments?
EPIC post, good sir.
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