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I think they are talking the shape of the periphery of the friction
material, not the thickness. Same thickness inside rotor to outside
rotor, but "shorter" pad material closer to the center of the rotor.Â
Shaped like
\_/
Piston / brake pad is flat to the rotor.
Cheers, Tony
On 7/3/2024 1:51 PM, Scott Janzen via Fot wrote:
> OK, Iâ??m confused and hoping to learn something here.
> I agree, the pads wear more on the outside, Iâ??m guessing in part also
> due to the higher velocity of the rotor at that point, in addition to
> the heat - related issues.
> However, if you get the friction material shaped as a trapezoid,
> doesnâ??t that result in either:
> a) the piston stays square, the back of the pad stays square against
> the piston, and the outer edge of the pad is the only part contacting
> the rotor and it just wears down until there is full contact, or
> b) the pad surface rests square against the rotor, the back of the pad
> is at an angle, forcing the piston to cock in the bore and causing
> more wear on those parts?
>
> Personally, when the pads get worn to the point where there is
> noticeable taper, I generally have found they are well more than half
> gone and I just replace them. Â I like my brakes to be at max
> performance. Â Same deal with rotors - especially stock ones are cheap
> for these cars, though I have gotten to splurging on the grooved,
> dimpled ones that do seem to provide a bit better braking and longer
> life of all components.
>
> On Jul 3, 2024, at 12:25 PM, JS Performance Motoring, LLC via Fot
> <fot@autox.team.net> wrote:
>
> Glen, great point!
>
> Seems that many race pad manufacturers try to give us the most
> material for our money with a big, rectangular friction material
> puck. This definitely works against us with the ancient, two piston
> calipers we run. More heat, and more surface speed out towards the
> edge of the rotor is a recipe for radial taper.
>
> I've found with enough complaining, I can get them to change the shape
> of the pad to a trapezoid, and it really does help as you say. It
> doesn't eliminate taper on my GT6 that's brutal on brakes, but it is a
> big step in the right direction.
>
> In lieu of a properly designed friction puck, I sometimes use a big
> file to adjust the shape of the friction material to accomplish the
> same thing.
>
> Running a thick spacer behind the pad as they wear down also helps
> keep the pistons true to the bore, and reduces heat transfer to the
> fluid/seals.
>
>
> Jason Sukey
> JS Performance Motoring, LLC
> 440.984.7720
> jason@jsperformancemotoring.com
> https://www.facebook.com/JSPerformanceMotoring/
>
>
> On Wed, Jul 3, 2024 at 12:14â?¯PM fubog1 via Fot <fot@autox.team.net> wrote:
>
> Another point to consider re pad selection, & I don't see
> mentioned, is make sure that the pads have the correct taper ie
> backer flat down, the profile of the pad side should taper down
> towards the center of the disc/bottom of the pad to some degree, a
> trapezoid with the long side up, ie not be rectangular shape.
> Reason is that a lot more heat is generated towards the OD of the
> disc, & they'll wear more; having less friction surface towards
> the bottom of the pad w/a taper evens the pad wear, & it won't
> develop the other form of "taper", that usually requires that 1st
> brake pedal stab as the rectangular shaped pads do as they wear.
> This applies to all TRs.
> I've also seen many cases where "interchanges" don't consider the
> shape of the pad, although the pads are dimensionally correct & fit.
>
> Glen Efinger
>
> On Monday, July 1, 2024 at 04:43:42 PM EDT, Mark Fisher via Fot
> <fot@autox.team.net> wrote:
>
>
> Hi All:
>
> What do you racers like for front pads on your Spits and GT6s?
>
> Thanks in advance,
>
> Mark Fisher
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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>
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>
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<p>I think they are talking the shape of the periphery of the
friction material, not the thickness. Same thickness inside rotor
to outside rotor, but "shorter" pad material closer to the center
of the rotor. Shaped like <br>
</p>
<p>\_/</p>
<p>Piston / brake pad is flat to the rotor.<br>
</p>
<p>Cheers, Tony<br>
</p>
<div class="moz-cite-prefix">On 7/3/2024 1:51 PM, Scott Janzen via
Fot wrote:<br>
</div>
<blockquote type="cite"
cite="mid:854B26D4-270C-4AFB-B7E8-3F4AE93AEDDA@me.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
OK, Iâ??m confused and hoping to learn something here.
<div class="">I agree, the pads wear more on the outside, Iâ??m
guessing in part also due to the higher velocity of the rotor at
that point, in addition to the heat - related issues.</div>
<div class="">However, if you get the friction material shaped as
a trapezoid, doesnâ??t that result in either:</div>
<div class="">a) the piston stays square, the back of the pad
stays square against the piston, and the outer edge of the pad
is the only part contacting the rotor and it just wears down
until there is full contact, or</div>
<div class="">b) the pad surface rests square against the rotor,
the back of the pad is at an angle, forcing the piston to cock
in the bore and causing more wear on those parts?</div>
<div class=""><br class="">
</div>
<div class="">Personally, when the pads get worn to the point
where there is noticeable taper, I generally have found they are
well more than half gone and I just replace them. Â I like my
brakes to be at max performance. Â Same deal with rotors -
especially stock ones are cheap for these cars, though I have
gotten to splurging on the grooved, dimpled ones that do seem to
provide a bit better braking and longer life of all components.<br
class="">
<div><br class="">
<div class="">On Jul 3, 2024, at 12:25 PM, JS Performance
Motoring, LLC via Fot <<a
href="mailto:fot@autox.team.net";
class="moz-txt-link-freetext"
moz-do-not-send="true">fot@autox.team.net</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="ltr" class="">Glen, great point!
<div class=""><br class="">
</div>
<div class="">Seems that many race pad manufacturers try
to give us the most material for our money with a big,
rectangular friction material puck. This
definitely works against us with the ancient, two piston
calipers we run. More heat, and more surface speed out
towards the edge of the rotor is a recipe for radial
taper.</div>
<div class=""><br class="">
</div>
<div class="">I've found with enough complaining, I can
get them to change the shape of the pad to a trapezoid,
and it really does help as you say. It doesn't
eliminate taper on my GT6 that's brutal on brakes, but
it is a big step in the right direction.</div>
<div class=""><br class="">
</div>
<div class="">In lieu of a properly designed friction
puck, I sometimes use a big file to adjust the shape of
the friction material to accomplish the same thing.</div>
<div class=""><br class="">
</div>
<div class="">Running a thick spacer behind the pad as
they wear down also helps keep the pistons true to the
bore, and reduces heat transfer to the fluid/seals.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">
<div class="">
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr" class="">
<div class="">
<div dir="ltr" class="">
<div class="">
<div dir="ltr" class="">
<div dir="ltr" class="">
<div dir="ltr" class="">
<div class="">Jason Sukey</div>
<div class=""><span class=""></span><span
class=""></span>JS Performance
Motoring, LLC<br class="">
</div>
<div class="">440.984.7720</div>
<div class=""><a
href="mailto:jason@jsperformancemotoring.com"; target="_blank"
class="moz-txt-link-freetext"
moz-do-not-send="true">jason@jsperformancemotoring.com</a><br
class="">
</div>
<div class=""><a
href="https://www.facebook.com/JSPerformanceMotoring/"; target="_blank"
class="moz-txt-link-freetext"
moz-do-not-send="true">https://www.facebook.com/JSPerformanceMotoring/</a><br
class="">
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br class="">
</div>
</div>
<br class="">
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jul 3, 2024 at
12:14â?¯PM fubog1 via Fot <<a
href="mailto:fot@autox.team.net";
class="moz-txt-link-freetext"
moz-do-not-send="true">fot@autox.team.net</a>>
wrote:<br class="">
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div class="">
<div
style="font-family:Arial,Helvetica,sans-serif;font-size:16px" class="">
<div dir="ltr" class="">Another point to consider re
pad selection, & I don't see mentioned, is
make sure that the pads have the correct taper ie
backer flat down, the profile of the pad side
should taper down towards the center of the
disc/bottom of the pad to some degree, a trapezoid
with the long side up, ie not be rectangular
shape.</div>
<div dir="ltr" class="">Reason is that a lot more
heat is generated towards the OD of the disc,
& they'll wear more; having less friction
surface towards the bottom of the pad w/a taper
evens the pad wear, & it won't develop the
other form of "taper", that usually requires that
1st brake pedal stab as the rectangular shaped
pads do as they wear.<br class="">
</div>
<div dir="ltr" class="">This applies to all TRs.</div>
<div dir="ltr" class="">I've also seen many cases
where "interchanges" don't consider the shape of
the pad, although the pads are dimensionally
correct & fit.</div>
<div dir="ltr" class=""><br class="">
</div>
<div dir="ltr" class="">Glen Efinger<br class="">
</div>
<div class=""><br class="">
</div>
</div>
<div
id="m_-2871832781424524163ydp23b6118fyahoo_quoted_0565246479" class="">
<div
style="font-family:Arial,Helvetica,sans-serif;font-size:16px" class="">
<div
style="font-family:"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42)"
class="">
<div class=""> On Monday, July 1, 2024 at
04:43:42 PM EDT, Mark Fisher via Fot <<a
href="mailto:fot@autox.team.net";
target="_blank"
class="moz-txt-link-freetext"
moz-do-not-send="true">fot@autox.team.net</a>>
wrote: </div>
</div>
<div
style="font-family:"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42);border-left:1px
solid rgb(204,204,204);padding-left:8px;margin:0px 0px 0px 8px"
class="">
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">
<div
id="m_-2871832781424524163ydp23b6118fyiv3112983551" class="">
<div class="">
<div
style="font-family:"times new roman","new
york",times,serif;font-size:18px"
class="">
<div dir="ltr" class="">Hi All:</div>
<div dir="ltr" class=""><br class="">
</div>
<div dir="ltr" class="">What do you
racers like for front pads on your
Spits and GT6s?</div>
<div dir="ltr" class=""><br class="">
</div>
<div dir="ltr" class="">Thanks in
advance,</div>
<div dir="ltr" class=""><br class="">
</div>
<div dir="ltr" class="">Mark Fisher</div>
<div dir="ltr" class=""><br class="">
</div>
</div>
</div>
</div>
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