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

[John Innis]

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, <eric at megageek.com> 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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