[Supras] More Brake caliper stuff

[Jeff Mohler]

True...Id go do that right now just to see.

Plan B...a 2psi residual valve in the brake line.

:)



On 9/18/06, Dana Franklin <bonescom at bellsouth.net> wrote:
> Hmmm...now I've never gone that road in the thought process.
>
> I guess the rotor not being on the hub true could cause this too.  But
> then again, that would cause vibration during braking.  That's not
> happening.  The thing is, I think the piston will fall back even when
> the car isn't moving.  I guess I could test that by pumping the brake up
> while not moving, letting off, wait a minute and hit it again to see if
> I have to pump it again.
>
> Otherwise, I can only assume that I rolled or pinched ANOTHER seal.
>
> Jeff Mohler wrote:
>
> > On any car but the MK3...this is a textbook bent spindle/hub, or a
> > weak one where in racing it deflects.  If youve changed ALL of these
> > other things..man, I dunno...
> >
> > Driving stress puts the caliper off center to the hub/spindle, and
> > forces the pistons in..which require an extra pump to get it back to
> > the rotor surface.
> >
> >
> > I get this in my RX7s (One of which won the NASA Nationals PTE class
> > and a new track record for the class at Mid Ohio this week) and I put
> > a spring under the piston which once were off a corner, pushes the
> > piston back to where it belongs so the nextbraking area has a stiff
> > pedal.
> >
> > On 9/18/06, Dana Franklin <bonescom at bellsouth.net> wrote:
> >
> >> Since we're on the subject, I have a good one for you guys.
> >>
> >> A few years ago, I went through all four calipers.  I can't recall for
> >> sure, but I think one was leaking so I rebuilt them.  Ever since, I have
> >> a rattle in the right front and I found that the caliper seems loose on
> >> the pins.  At first, I replaced all the pins and their hardware.  Same
> >> thing.  In addition, I have a pedal that needs one good pump before they
> >> come up to the top.  I found out that the when you hit the brake, the
> >> piston is making it's way all the way back into the caliper.  Thus, each
> >> time you hit the brake, you have to move the piston all that way again.
> >>
> >> I'd seen this before.  Usually, it's a rolled o-ring.  So, I bought a
> >> new kit and rebuilt it again, being very careful this time.
> >>
> >> Now, this is by no means the first set of calipers I've rebuilt in my
> >> life but, for whatever reason, it was fine for about a day and it was
> >> back to doing it again.  I can't think of anything that could be wrong
> >> with the caliper or the piston that would cause that.  I messed with
> >> that thing on the bench after I put it back together and it worked fine.
> >>
> >> Just wanted to throw that out and see what you guys thought.
> >>
> >> --
> >> Dana Franklin a.k.a. "Bones"  87T
> >>
> >> SOGI Member (Supra Owners Group International) http://www.supras.com
> >>
> >>
> >>
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> >>
> >
> >
>
> --
> Dana Franklin a.k.a. "Bones"  87T
>
> SOGI Member (Supra Owners Group International) http://www.supras.com
> SCORE Member (Savannah-Chatham Offroad Racing Enthusiasts)  http://www.score-racing.org
>
>
>