I would second the recommendation for the Porterfield R4. I went to these after
running Ferodo DS-11, also great pads, but no longer available.
The friction material is set a little high on the R4 pads, running proud of the
stock rotor but that does not seem to be a problem. Will discuss with
Porterfield when I order the next set and can send them a worn pad. This
problem occurred on both of the two different cars we have.
Phil Gott
Sent from my iPhone
> On Jul 10, 2018, at 8:01 PM, Dennis DeLap via Fot <fot at autox.team.net>
> wrote:
>
> Also try KFP magnum pads.
> Pauric inc. Canton Ohio
> 330-453-9757
> From: DAVE HOGYE via Fot
> Sent: ?7/?10/?2018 4:41 PM
> To: Friends of Triumph
> 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
>
>
>
> _______________________________________________
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>
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>
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