Subject: Re: [Shop-talk] Why in the world do we need 'spinning' brake pistons?

From: Larry Spector <[email-masked]>
Date: Thu, 13 Sep 2018 16:02:29 -0400

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It has to do with the parking brake. There's a mechanism in the caliper
that pushes on the piston when you activate the parking brake. The spinning
piston is the self-adjuster to deal with brake pad wear so the system works
with worn pads.

I don't think it's all that new- my '91 MR2 had this, and it was likely
around for a while before then.

-Larry

On Thu, Sep 13, 2018 at 3:54 PM <[email-masked]> wrote:

> Can someone please let me know what the advantage of the new 'spin to
> compress' brake pistons are?
>
> Seriously, were cars flying off the road with no brakes and I didn't
> notice it?
>
> This new system requires more tools* (and they didn't even standardize the
> pattern), more effort, most of the time destroys the boot, and requires you
> to line up a pin with the de-tent so you can put the caliper on.
>
> So what am I missing?  Why are these better?  I would image they are more
> complicated on the inside as well.  Also seems that they require more
> machining/parts to make.
>
>
> *=I don't mind buying more tools, in fact I already bought the tool and
> I'm looking at an upgraded version of it.
>
>
> Sent from my Commodore 64 on a 2400 Baud Modem.
> Tech Viper
> "Be as beneficent as the sun or the sea, but if your rights as a rational
> being are trenched on, die on the first inch of your territory." Ralph
> Waldo Emerson _______________________________________________
>
>
>

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<div dir=3D"ltr">It has to do with the parking brake. There&#39;s a mechani=
sm in the caliper that pushes on the piston when you activate the parking b=
rake. The spinning piston is the self-adjuster to deal with brake pad wear =
so the system works with worn pads.<div><br></div><div>I don&#39;t think it=
&#39;s all that new- my &#39;91 MR2 had this, and it was likely around for =
a while before then.</div><div><br></div><div>-Larry</div><div><br><div cla=
ss=3D"gmail_quote"><div dir=3D"ltr">On Thu, Sep 13, 2018 at 3:54 PM &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex"><font size=3D"2" face=3D"sans-serif">Can so=
meone please let me know what the
advantage of the new &#39;spin to compress&#39; brake pistons are?</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">Seriously, were cars flying off th=
e
road with no brakes and I didn&#39;t notice it?</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">This new system requires more tool=
s*
(and they didn&#39;t even standardize the pattern), more effort, most of th=
e
time destroys the boot, and requires you to line up a pin with the de-tent
so you can put the caliper on.</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">So what am I missing?=C2=A0 Why ar=
e
these better?=C2=A0 I would image they are more complicated on the inside
as well.=C2=A0 Also seems that they require more machining/parts to make.</=
font>
<br>
<br>
<br><font size=3D"2" face=3D"sans-serif">*=3DI don&#39;t mind buying more t=
ools, in
fact I already bought the tool and I&#39;m looking at an upgraded version o=
f
it. =C2=A0</font>
<br><font size=3D"2" face=3D"sans-serif"><br>
<br>
Sent from my Commodore 64 on a 2400 Baud Modem.<br>
Tech Viper<br>
&quot;Be as beneficent as the sun or the sea, but if your rights as a ratio=
nal
being are trenched on, die on the first inch of your territory.&quot; Ralph
Waldo Emerson </font>_______________________________________________<br>
<br><br>
</blockquote></div></div></div>

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_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk

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From: John Innis <[email-masked]>
Date: Thu, 13 Sep 2018 15:08:17 -0500

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I thought these were invented as a way to incorporate a parking brake
function into a fully disc brake system.  Basically a fully mechanical way
of activating the caliper.  There have been other methods in the past but
all of them seem to suck.  These have been around a long time, and the
degree of suckage has varied.  My '86 Trans AM had this system, and it
actually was not too bad to work on. Of course it did not work very well as
a parking brake, but I had the auto, so I never really cared.  Until the
shift linkage came loose and I could not get the car into park.  That day
sucked a lot.

On Thu, Sep 13, 2018 at 7:05 AM, <[email-masked]> wrote:

> Waldo Emerson
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Unsubscribe/Manage: http://autox.team.net/mailman/
> options/shop-talk/[email-masked]
>
>
>

-- 
=================================
= Never offend people with style when you   =
= can offend with substance --- Sam Brown  =
=================================

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<div dir=3D"ltr">I thought these were invented as a way to incorporate a pa=
rking brake function into a fully disc brake system.=C2=A0 Basically a full=
y mechanical way of activating the caliper.=C2=A0 There have been other met=
hods in the past but all of them seem to suck.=C2=A0 These have been around=
 a long time, and the degree of suckage has varied.=C2=A0 My &#39;86 Trans =
AM had this system, and it actually was not too bad to work on. Of course i=
t did not work very well as a parking brake, but I had the auto, so I never=
 really cared.=C2=A0 Until the shift linkage came loose and I could not get=
 the car into park.=C2=A0 That day sucked a lot.<br></div><div class=3D"gma=
il_extra"><br><div class=3D"gmail_quote">On Thu, Sep 13, 2018 at 7:05 AM,  =
<span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank=
">[email-masked]</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><font size=3D"2" face=3D"sans-serif">Can someone please let me know what t=
he
Waldo Emerson </font><br>______________________________<wbr>_______________=
__<br>
<br>
<a href=3D"mailto:[email-masked]">[email-masked]</a><br=
et=3D"_blank">http://www.team.net/donate.<wbr>html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk" rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/<wbr>shop-talk</a><br>
<br>
alk/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.te=
am.net/mailman/<wbr>options/shop-talk/jdinnis@<wbr>gmail.com</a><br>
<br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature" data-smartmail=3D"gmail_signature">=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br=
>=3D Never offend people with style when you=C2=A0=C2=A0 =3D<br>=3D can off=
end with substance --- Sam Brown=C2=A0 =3D<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</d=
iv>
</div>

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[email-masked]

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From: Brian Kemp <[email-masked]>
Date: Thu, 13 Sep 2018 16:16:32 -0700

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I'm told it is how the parking brake adjusts itself when the pads get 
worn.  The parking brake lever pulls a cable which actuates the rear 
brake calipers.  Discovered the special tool after battling the rear 
brakes on my wife's Jetta.  I borrowed the special tool from the local 
O'Reilly or Pep Boys.

If I remember correctly, I had to use the brakes a couple times before 
the parking brake worked again.

Brian

On 9/13/2018 5:05 AM, [email-masked] wrote:
> This new system requires more tools* (and they didn't even standardize 
> the pattern), more effort, most of the time destroys the boot, and 
> requires you to line up a pin with the de-tent so you can put the 
> caliper on.
>
> So what am I missing?  Why are these better?  I would image they are 
> more complicated on the inside as well.  Also seems that they require 
> more machining/parts to make.
>
>
> *=I don't mind buying more tools, in fact I already bought the tool 
> and I'm looking at an upgraded version of it.
>
>
> "Be as beneficent as the sun or the sea, but if your rights as a 
> rational being are trenched on, die on the first inch of your 
> territory." Ralph Waldo Emerson
>
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/shop-talk/[email-masked]
>

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<html>
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  <body text="#000000" bgcolor="#FFFFFF">
    I'm told it is how the parking brake adjusts itself when the pads
    get worn.  The parking brake lever pulls a cable which actuates the
    rear brake calipers.  Discovered the special tool after battling the
    rear brakes on my wife's Jetta.  I borrowed the special tool from
    the local O'Reilly or Pep Boys.<br>
    <br>
    If I remember correctly, I had to use the brakes a couple times
    before the parking brake worked again.<br>
    <br>
    Brian<br>
    <br>
    <div class="moz-cite-prefix">On 9/13/2018 5:05 AM, <a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a>
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html;
        charset=windows-1252">
      <font size="2" face="sans-serif">Can someone please let me know
        what the
        advantage of the new 'spin to compress' brake pistons are?</font>
      <br>
      <br>
      <font size="2" face="sans-serif">Seriously, were cars flying off
        the
        road with no brakes and I didn't notice it?</font>
      <br>
      <br>
      <font size="2" face="sans-serif">This new system requires more
        tools*
        (and they didn't even standardize the pattern), more effort,
        most of the
        time destroys the boot, and requires you to line up a pin with
        the de-tent
        so you can put the caliper on.</font>
      <br>
      <br>
      <font size="2" face="sans-serif">So what am I missing?  Why are
        these better?  I would image they are more complicated on the
        inside
        as well.  Also seems that they require more machining/parts to
        make.</font>
      <br>
      <br>
      <br>
      <font size="2" face="sans-serif">*=I don't mind buying more tools,
        in
        fact I already bought the tool and I'm looking at an upgraded
        version of
        it.  </font>
      <br>
      <font size="2" face="sans-serif"><br>
        <br>
        Sent from my Commodore 64 on a 2400 Baud Modem.<br>
        Tech Viper<br>
        "Be as beneficent as the sun or the sea, but if your rights as a
        rational
        being are trenched on, die on the first inch of your territory."
        Ralph
        Waldo Emerson </font>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________

<a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a>
Archive: <a class="moz-txt-link-freetext" href="http://www.team.net/pipermail/shop-talk">http://www.team.net/pipermail/shop-talk</a>

</pre>
    </blockquote>
    <br>
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[email-masked]

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From: John Miller <[email-masked]>
Date: Fri, 14 Sep 2018 07:24:46 -0700

> brakes on my wife's Jetta.  I borrowed the special tool from the local 

You have three basic approaches out there for a parking brake with rear 
discs.  One (common in higher-end German products, trucks, and a few 
others) is to put a drum in the hat of the rear rotor.

One (found generally on high-end products - Italian exotics, high-end 
Jags, Tesla Model S/X) and some aftermarket kits) is a separate 
mechanically-actuated parking-brake caliper.

The third and by far most common is to put a screw-jack mechanism inside 
the rear caliper piston.

This is where the retraction tool comes in, and yeah, it's a PITA that 
they're all different.

John.

[email-masked]

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