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<div><div style="direction: ltr;">As far as braking effect it’s simple math. Assuming the master cylinder, pad compound and rotors are not changed then the calipers with the largest dia pistons will, for a given pedal effort, generate more clamping force. If you care to to go to extremes then you would also factor in the distance from the axle center to the CG of the pad friction which is the “friction radius” - but that’s picking the fly poop out of the pepper for what you are doing. </div><div style="direction: ltr;"> </div><div style="direction: ltr;">Other considerations: </div><div><br></div><div style="direction: ltr;">Assuming the TR6 caliper will bolt up to the TR3 knuckle, you would need to make sure the rotor path through the caliper would accept the bigger rotor- likely would but should be checked. At some point a rotor with larger dia than the caliper is designed for will touch the rotor path at the ends of the caliper (to small of rotor will touch in the path next to the pad opening). In both those extremes the pads typically won’t fit either. </div><div><br></div><div style="direction: ltr;">Another issue to check is rotor thickness. If the TR3 rotor is thinner then make sure as the pads wear that a caliper piston can’t come out of the caliper. </div><div><br></div><div style="direction: ltr;">Also check the pad to make sure it’s annulus is not larger than the TR3 rotor. You don’t want overhang or under hang of friction material. Also you want the friction to cover the rotor with very little unused swept area of rotor ID or OD. To much unused iron can be a problem also. </div><div><br></div><div><br></div></div>
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<div class="gmail_quote">On Wed, Jul 11, 2018 at 8:23 PM -0400, "John H. Hasty" <span dir="ltr"><<a href="mailto:jhasty@mhc-law.com" target="_blank">jhasty@mhc-law.com</a>></span> wrote:<br>
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What is the effect of using TR6 calipers designed for use on 10.75 rotors on TR3 11” rotors ?<br>
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<div id="AppleMailSignature">Sent from my iPhone</div>
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On Jul 11, 2018, at 6:27 PM, Ashley Page via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<br>
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<div style="direction: ltr;">As Glenn pointed out ID to OD taper happens with some pads. </div>
<div style="direction: ltr;">Can also be a sign of loose wheel bearings. </div>
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<div style="direction: ltr;">But probably as he describes due to higher rubbing speed on OD. </div>
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<div style="direction: ltr;">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</div>
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<div class="gmail_quote">On Wed, Jul 11, 2018 at 2:08 PM -0400, "timmmurphh--- via Fot"
<span dir="ltr"><<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>></span> wrote:<br>
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<p class="MsoNormal"><b>From:</b> <a href="mailto:timmmurphh@gmail.com">timmmurphh@gmail.com</a> <<a href="mailto:timmmurphh@gmail.com">timmmurphh@gmail.com</a>>
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<b>Sent:</b> Wednesday, July 11, 2018 8:36 AM<br>
<b>To:</b> 'DAVE HOGYE' <<a href="mailto:dlhogye@comcast.net">dlhogye@comcast.net</a>><br>
<b>Subject:</b> RE: [Fot] brake pad and rotor discovery and update<o:p></o:p></p>
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<p class="MsoNormal">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”?<o:p></o:p></p>
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<p class="MsoNormal">Tim Murphy<o:p></o:p></p>
<p class="MsoNormal">#317 TR4<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Fot <<a href="mailto:fot-bounces@autox.team.net">fot-bounces@autox.team.net</a>>
<b>On Behalf Of </b>DAVE HOGYE via Fot<br>
<b>Sent:</b> Tuesday, July 10, 2018 3:22 PM<br>
<b>To:</b> Friends of Triumph <<a href="mailto:Fot@autox.team.net">Fot@autox.team.net</a>><br>
<b>Subject:</b> [Fot] brake pad and rotor discovery and update<o:p></o:p></p>
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<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">Hello Friends,<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"> <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">What I found was that the Carbotech CT-57 pads were causing the problem.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">
<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"> <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"> <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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. <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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. <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"> <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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. <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">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. <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">It looks like I have to find another race pad supplier. <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">Thoughts?<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">Dave H.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333">831-234-4928<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p> </o:p></span></p>
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