[Fot] TR6 Porterfield R-4 Rear Brake Shoes - Carbotech relining

[DAVE HOGYE]

I used Carbotech a few times for front pads.  I had lots of problems with them.  Quality control is/was terrible.  The backing plate was ground down to the friction material at the sides of the pads and they were not square.  So, there was far to much clearance in the caliper slot.  This caused the piston to torque once the brakes were applied.  This makes the pads wear at an extreme angle and the pistons were leaving a witness mark in the bore from the induced torquing and side load.  The hot friction material was making contact with the caliper casting.  I talked with Carbotech a few times about this and they were completely defensive and said they sell a lot of these pads and no one ever complained about this problem before.  They were not willing to check quality control or make them correctly.  I took many photos and some video of exactly what was happening and made a direct comparison to standard pads and Hawk pads.  The standard pads were NOS from a quality manufacturer, which I can't recall at the moment.  Standard backing plate have a pretty tight fit in the caliper.  I think I found .010" clearance.  I found that the Hawk pads have very consistent production quality.  So I switched to Hawk.  I did like the feel of the Carbotech pads, but they really caused problems.  
I'll share some photos and later.
Dave H.

> On 05/22/2024 1:53 PM PDT Mark Cook via Fot <fot at autox.team.net> wrote:
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> All,
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> I spoke with Carbotech this afternoon after John and Ken’s email.  Carbotech will reline brake shoes and are familiar with vintage racing and autocross requirements.
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> Send the cores, along with brake drum specs (inside diameter so they can arc it correctly) and  your contact information (phone, email and address) to the Carbotech address below (not their Cleveland location).   They will give you a call back regarding the compound to use/recommended, based on type of racing (or street), vehicle drum size etc.
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> Carbotech Performance Brakes
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> 4031 Dearborn Place N.W.
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> Concord, NC 28027
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> Thanks,
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> Mark
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> From: Mark Cook [mailto:mecook at mindspring.com]
> Sent: Wednesday, May 22, 2024 4:37 PM
> To: 'John H. Hasty'; 'Ken Knight'
> Cc: 'Friends of Triumph Group Email'
> Subject: RE: [Fot] TR6 Porterfield R-4 Rear Brake Shoes
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> John and Ken,
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> Thanks and will give Carbotech a call – was not aware they would reline brake shoes since it is not mentioned on their site.
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> Do you use the XP8 or XP10 compound?
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> Much appreciated,
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> Mark
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> From: John H. Hasty [mailto:jhasty at mhc-law.com]
> Sent: Wednesday, May 22, 2024 2:34 PM
> To: Ken Knight; Mark Cook; Friends of Triumph Group Email
> Subject: RE: [Fot] TR6 Porterfield R-4 Rear Brake Shoes
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> They are also in Charlotte, 877 899 5024 I think the shoes are made somewhere in Ohio but they can tell you
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> [image001.png]
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> John H. Hasty
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> Of Counsel
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> Mullen Holland & Cooper P.A.
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> 301 S. York St.,
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> P.O. Box 488
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> Gastonia, NC 28053
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> 704.864.6751 (p) 704.861.8394 (f)
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> mhc-law.com http://mhc-law.com/ | jhasty at mhc-law.com mailto:jhasty at mhc-law.com
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> From: Fot <fot-bounces at autox.team.net> On Behalf Of Ken Knight via Fot
> Sent: Wednesday, May 22, 2024 1:39 PM
> To: Mark Cook <mecook at mindspring.com>; Friends of Triumph Group Email <fot at autox.team.net>
> Subject: Re: [Fot] TR6 Porterfield R-4 Rear Brake Shoes
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> Carbotech.  Used them for years.  They are in TX, use the Google.  Good Luck, Ken
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> Sent from Mail https://go.microsoft.com/fwlink/?LinkId=550986 for Windows
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> From: Mark Cook via Fot mailto:fot at autox.team.net
> Sent: Wednesday, May 22, 2024 9:35 AM
> To: Friends of Triumph Group Email mailto:fot at autox.team.net
> Subject: [Fot] TR6 Porterfield R-4 Rear Brake Shoes
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> Porterfield is continuing to have production problems (since January) with the TR6 234 R-4 brake shoes due to curing issues and are trying a new resin.  In the meantime, is there another compatible product/brand for racing?
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> I like to have a back up set.
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> Thanks,
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> Mark Cook
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> _______________________________________________
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