[Supras] More Brake caliper stuff

[Dana Franklin]

Heh.  Well, I can't try now.  I'll try tomorrow when I get home from work. 
I'll let you know what happens.

Thanks for the help.  :)

Jeff Mohler wrote:

> 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
>>
>>
>>
>
>

-- 
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