Re: Sticking brakes

[John Erk <johnny.erk@sympatico.ca>]

The bores for the guide pins were sandblasted fine cause they were
rusted.He put in new rubber bushings, teflon and bolts. He tells me he
cleaned out the piston bore well but he's an old Italian who's a genius
with Alfas, but maybe he don't looka so good.
Anyway, he put anti squeel grease on the pads and they do work well
until they heat up and stick. I'm going to put in rebuilt calipers(I
found out I can get them for $35Cdn) instead of rebuilding them again.
The calipers stay the same when going from solid 9.4 to vented 9.4, only
the pads are thinner, correct?
What does the servo do exactly? Can this be my problem?
John

Mark Mages wrote:

> > My mech says he he rebuilt it properly (sand
> > blasted, greased etc).Are
> ?????
> He sand-blasted your calipers?  What the heck for?
> I guess you could clean the outside that way, but I
> would've left them dirty before I sandblasted them.
> If you can't get it off with simple green & a scrub
> brush or brake parts cleaner, then I would have left
> it.  Doesn't hurt performance - the insides need to be
> really clean, but I wouldn't sand blast them.  Sand
> will stick in crevices... especially when mixed with
> oil & fluid.
> And there should be no grease at all anywhere on the
> calipers. All lubrication of the calipers should be
> done with dot3/4 brake fluid only.
>
> > there supposed to be those 2 angled grooves on the
> > surface of the piston
>
> There should be no grooves or pits on the piston
> surface either.  There is a notch for the dust boot to
> fit into, but grooves are bad.  If there are any
> grooves, or scoring/rust on the pistons, they should
> be replaced (per Bentley).
>
> > (I have the newer Kelsey-Hayes 85 8v)?Could the
> > hoses be clogged up so
> > that the piston doesn't return?
> Dunno - shouldn't matter.  Could be a problem with the
> Servo not releasing pressure... but I don;t know.
>
> > Master cylinder?
>
> Probably not.  When the MC starts to go, the brakes
> feel squishy.
> > The brakes always feel
> > good...Any ideas?
>
> Yah - flush your brake lines completely.  Use a good
> brake parts cleaner, and clean off any grease that is
> anywhere on the caliper or pads.
>
> Short of re-rebuilding them, that's all I can think
> of..... It might be a good idea to re-rebuild them
> ($5.50 for the seals and an aircompressor is all you
> need if all the parts are good)  Follow the Bentley
> procedure to a T.  Check all parts.
>
> HTH
>
> =====
> Mark
> If you're not paranoid, you're not paying attention.
>
> 87 Westfalia Gl
> 84 Scirocco 8v
> http://student.fortlewis.edu/~mwmages/
>
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