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<div> <font size="2">Assuming that this is a type 16 caliper, they are all pretty much the same. There are 2 different style pads, "big" pin & "little" pin, dimensionally they are the same, and there are differences in the friction material shape. Some are rectangular, some are the shape of the lower half of a hexagon.</font></div>
<div><font size="2">These cars need a pad with a taper because they run hotter and wear faster towards the OD.</font></div>
<div><font size="2">If you're running a full rectangular pad (same shape as the backer), it's gonna wear towards the OD and get a taper in it in-to-out, and that's when the pad/piston alignment gets all poopo-kaka, the pedal gets long, etc.<br>
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<div><font size="2">I'm not suggesting that there isn't an issue with what you have discovered but the pad backer ends to the caliper clearance isn't a real close tolerance point.</font></div>
<div><font size="2">Hope you get it sorted.</font></div>
<div><font size="2">Glen<br>
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<div><font size="2">ps- </font><font size="2"><font size="2">Also I might be misunderstanding the problem...</font></font></div>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: DAVE HOGYE via Fot <fot@autox.team.net><br>
To: Friends of Triumph <Fot@autox.team.net><br>
Sent: Tue, Jul 10, 2018 5:52 pm<br>
Subject: [Fot] brake pad and rotor discovery and update<br>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">Hello Friends,</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"> </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">What I found was that the Carbotech CT-57 pads were causing the problem.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"> </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"> </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"> </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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. </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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. </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"> </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"><br>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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. </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"><br>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"><br>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">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. </div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"><br>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">It looks like I have to find another race pad supplier. </div>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">Thoughts?</div>
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<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">Dave H.</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">831-234-4928</div>
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