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[Fot] FW: brake pad and rotor discovery and update

Subject: [Fot] FW: brake pad and rotor discovery and update
From: sjanzen at me.com (Scott Janzen)
Date: Wed, 11 Jul 2018 22:33:06 -0400
References: <1496073395.378283.1531254099121@connect.xfinity.com> <000001d4191c$23b6fac0$6b24f040$@gmail.com> <002101d4192b$ccfd2fa0$66f78ee0$@gmail.com> <5D3076785B8A61C5.41E5DF95-760C-4BB7-9248-CEC5A8426678@mail.outlook.com> <8E56E6CE-D9CC-46E5-A2C2-96E5166BE1E7@mhc-law.com>
The same calipers are used on GT6 9.5? rotors. 

Sent from my iPhone

> On Jul 11, 2018, at 8:23 PM, John H. Hasty via Fot <fot at autox.team.net> 
> wrote:
> 
> What is the effect of using TR6 calipers designed for use on 10.75 rotors on 
> TR3 11? rotors ?
> 
> Sent from my iPhone
> 
> On Jul 11, 2018, at 6:27 PM, Ashley Page via Fot <fot at autox.team.net> 
> wrote:
> 
>> As Glenn pointed out ID to OD taper happens with some pads. 
>> Can also be a sign of loose wheel bearings. 
>> 
>> But probably as he describes due to higher rubbing speed on OD. 
>> 
>> You can easily taper cut the pads with a 4? diamond masonry blade from just 
>> about any hardware or Lowe?s. You can do it with any number of ways even a 
>> hacksaw but anything but diamond will wear quickly
>> Get Outlook for iOS
>> 
>> 
>> 
>> On Wed, Jul 11, 2018 at 2:08 PM -0400, "timmmurphh--- via Fot" <fot at 
>> autox.team.net> wrote:
>> 
>>>  
>>>  
>>> From: timmmurphh at gmail.com <timmmurphh at gmail.com> 
>>> Sent: Wednesday, July 11, 2018 8:36 AM
>>> To: 'DAVE HOGYE' <dlhogye at comcast.net>
>>> Subject: RE: [Fot] brake pad and rotor discovery and update
>>>  
>>> Thanks for this report.  We have had some issues with the Carbotech pads on 
>>> our TR4 at Blackhawk and the Kcup.  We use the CT2-XP10 compound.  I will 
>>> check our pad to caliper slot clearance.  Does anyone know offhand of the 
>>> slot on the 16P calipers on our TR4 is the same as the TR3 at 3.095??
>>>  
>>> Tim Murphy
>>> #317 TR4
>>>  
>>> From: Fot <fot-bounces at autox.team.net> On Behalf Of DAVE HOGYE via Fot
>>> Sent: Tuesday, July 10, 2018 3:22 PM
>>> To: Friends of Triumph <Fot at autox.team.net>
>>> Subject: [Fot] brake pad and rotor discovery and update
>>>  
>>> Hello Friends,
>>> 
>>> I have been finding out quite a bit about the unusual and developing front 
>>> brake pad, rotor and caliper issues that I have discovered on my TR3.
>>> 
>>>  
>>> 
>>> What I found was that the Carbotech CT-57 pads were causing the problem.
>>> 
>>>  
>>> 
>>> The supporting or backing plates of the pads had been ground down at 
>>> Carbotech, far under the normal plate width that I measured in 4 other 
>>> production pads that I have on hand.  Besides that, they were not ground 
>>> down squarely.
>>> 
>>>   
>>> 
>>> This allowed the piston to take tremendous side load under braking causing 
>>> the uneven and diagonal wear pattern in the pads.  This also caused the 
>>> rotor to contact the caliper as the pads took on heavy uneven wear.
>>> 
>>>   
>>> 
>>> The slot in the TR6 caliper is 3.095" and the four non-Carbotech pads sets 
>>> have a plate width of no less than 3.082".  The Carbotech plates have an 
>>> out of square measurement of 3.030-3.050".  That's as much as .065" 
>>> clearance in the caliper slot.  
>>> 
>>> The plates have too much clearance.  I found that a maximum of .010" 
>>> backing plate to caliper slot clearance is more normal.  One set of pads 
>>> have only .005" clearance. 
>>> 
>>>  
>>> 
>>> Furthermore, the corners of the Carbotech plates and pads were ground down 
>>> far enough that the lower end of the pads hardly made contact with the 
>>> caliper slot allowing more stress on the caliper piston.
>>> 
>>>  
>>> 
>>> I have been going back and forth with Carbotech on this matter and I will 
>>> be sending back the badly worn set along with a brand set that have the 
>>> same production issues.  I bought the two sets at the same time last 
>>> August.  
>>> 
>>>  
>>> 
>>> What I found is that any backing plates that show evidence of sanding or 
>>> grinding marks should be measured for proper clearance, but that really, 
>>> there should be no sanding or grinding marks...ever.
>>> 
>>>  
>>> 
>>> All of the other pads I have show no evidence of sanding or grinding marks. 
>>>  The previously shaped friction pads are cleanly attached to the backing 
>>> plates and the backing plate is revealed around the friction material.  
>>> Only the backing plate makes contact with the caliper slot.  
>>> 
>>>  
>>> 
>>> It looks like I have to find another race pad supplier.  
>>> 
>>>  
>>> 
>>> Thoughts?
>>> 
>>>  
>>> 
>>> Dave H.
>>> 
>>> 831-234-4928
>>> 
>>>  
>>> 
>> _______________________________________________
>> fot at autox.team.net
>> 
>> http://www.fot-racing.com
>> 
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>> 
>> 
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> 
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