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OK, I=E2=80=99m confused and hoping to learn something here.
I agree, the pads wear more on the outside, I=E2=80=99m 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, =
doesn=E2=80=99t 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. I like my brakes to be at max =
performance. 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
https://www.facebook.com/JSPerformanceMotoring/ =
<https://www.facebook.com/JSPerformanceMotoring/>
On Wed, Jul 3, 2024 at 12:14=E2=80=AFPM fubog1 via Fot =
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 =
Hi All:
What do you racers like for front pads on your Spits and GT6s?
Thanks in advance,
Mark Fisher
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>
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http://www.fot-racing.com
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">OK, =
I=E2=80=99m confused and hoping to learn something here.<div class=3D"">I =
agree, the pads wear more on the outside, I=E2=80=99m 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=3D"">However, if you get =
the friction material shaped as a trapezoid, doesn=E2=80=99t that result =
in either:</div><div class=3D"">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=3D"">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=3D""><br class=3D""></div><div =
class=3D"">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. I like my brakes to be at max =
performance. 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=3D""><div><br class=3D""><div =
class=3D"">On Jul 3, 2024, at 12:25 PM, JS Performance Motoring, LLC via =
Fot <<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D"">Glen, great point!<div class=3D""><br class=3D""></div><div =
class=3D"">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=3D""><br class=3D""></div><div class=3D"">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=3D""><br class=3D""></div><div =
class=3D"">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=3D""><br class=3D""></div><div =
class=3D"">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=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><div class=3D""><div =
dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr" class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D""><div dir=3D"ltr" =
class=3D""><div dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D"">Jason Sukey</div><div class=3D""><span class=3D""></span><span =
class=3D""></span>JS Performance Motoring, LLC<br class=3D""></div><div =
class=3D"">440.984.7720</div><div class=3D""><a =
href=3D"mailto:jason@jsperformancemotoring.com"; target=3D"_blank" =
class=3D"">jason@jsperformancemotoring.com</a><br class=3D""></div><div =
class=3D""><a href=3D"https://www.facebook.com/JSPerformanceMotoring/"; =
target=3D"_blank" =
class=3D"">https://www.facebook.com/JSPerformanceMotoring/</a><br =
class=3D""></div></div></div></div></div></div></div></div></div></div><br=
class=3D""></div></div><br class=3D""><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 3, 2024 at 12:14=E2=80=AFPM =
fubog1 via Fot <<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>> wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div =
style=3D"font-family:Arial,Helvetica,sans-serif;font-size:16px" =
class=3D""><div class=3D""></div>
<div dir=3D"ltr" class=3D"">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=3D"ltr" class=3D"">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=3D""></div><div dir=3D"ltr" class=3D"">This applies =
to all TRs.</div><div dir=3D"ltr" class=3D"">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=3D"ltr" =
class=3D""><br class=3D""></div><div dir=3D"ltr" class=3D"">Glen =
Efinger<br class=3D""></div><div class=3D""><br class=3D""></div>
=20
</div><div =
id=3D"m_-2871832781424524163ydp23b6118fyahoo_quoted_0565246479" =
class=3D""><div =
style=3D"font-family:Arial,Helvetica,sans-serif;font-size:16px" =
class=3D"">
<div style=3D"font-family:"Helvetica =
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42)" =
class=3D"">
=20
<div class=3D"">
On Monday, July 1, 2024 at 04:43:42 PM EDT, Mark =
Fisher via Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank"=
class=3D"">fot@autox.team.net</a>> wrote:
</div>
</div><div style=3D"font-family:"Helvetica =
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42);b=
order-left:1px solid rgb(204,204,204);padding-left:8px;margin:0px 0px =
0px 8px" class=3D"">
<div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div>
<div class=3D""><div =
id=3D"m_-2871832781424524163ydp23b6118fyiv3112983551" class=3D""><div =
class=3D""><div style=3D"font-family:"times new =
roman","new york",times,serif;font-size:18px" =
class=3D""><div dir=3D"ltr" class=3D"">Hi All:</div><div dir=3D"ltr" =
class=3D""><br class=3D""></div><div dir=3D"ltr" class=3D"">What do you =
racers like for front pads on your Spits and GT6s?</div><div dir=3D"ltr" =
class=3D""><br class=3D""></div><div dir=3D"ltr" class=3D"">Thanks in =
advance,</div><div dir=3D"ltr" class=3D""><br class=3D""></div><div =
dir=3D"ltr" class=3D"">Mark Fisher</div><div dir=3D"ltr" class=3D""><br =
class=3D""></div></div></div></div>_______________________________________=
________<br class=3D""><a href=3D"mailto:fot@autox.team.net"; =
rel=3D"nofollow" target=3D"_blank" class=3D"">fot@autox.team.net</a><br =
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</blockquote></div>
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