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[Fot] brake pad and rotor discovery and update

Subject: [Fot] brake pad and rotor discovery and update
From: duncan.charlton54 at gmail.com (Duncan Charlton)
Date: Tue, 10 Jul 2018 17:41:29 -0500
References: <1496073395.378283.1531254099121@connect.xfinity.com>
You might want to look up Porterfield.  I?ve used their R4-1 compound on two 
cars (both on the disc pads and the drum shoes) and have been happy with it.  I 
called them after I received the pads to ask their recommendation for bedding 
in the pads and the first person I spoke to laid it out clearly and in detail.

Duncan
(Texas)

> On Jul 10, 2018, at 3:21 PM, DAVE HOGYE via Fot <fot at autox.team.net> wrote:
> 
> 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
> 
> 
> 
> _______________________________________________
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> 
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> 
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