Date:         Sun, 11 Sep 2011 17:18:25 -0400
Reply-To:     Edward Maglott <emaglott3@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Edward Maglott <emaglott3@GMAIL.COM>
Subject:      Re: Brake Fade
In-Reply-To:  <BAY152-ds168E1B06F90FAAA4E5761EA0000@phx.gbl>
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OK, here's the next report.  the 2 products the auto tech instructor
loaned me are, CRC De-Squeak spray, technician grade.  "spray a light
even coating on the friction surface of the rotor."  So I did
that.  It goes on like light paint.  The other one is Wynn's Stop
Squeak to put on the pads.  It's a thin liquid that seems to have
very fine particles suspended.  About 3-4 drops on each pad, spread
it around and let it dry.  Then repeat and let it dry at least 15
minutes before reassembly.  So I did that.  Then I drove slowly
around the block a little testing things out.  Braking effect was
reduced on the first few applications.  Then I went and made some
moderate stops from 45 to about 10mph.  4 or 5 of those in fairly
rapid succession and I could smell the brakes and was just starting
to feel the fade on the last stop.  (maybe I did too much?)  Then
gentle drive home, about a mile, maybe 5-7 minutes.  Read brake temps
with IR gun.  Hard to get a good reading through the holes in the
wheels, but I took the highest
readings.  Fronts:  330/360.  Rears:  224/197.  I have a wheel
cylinder replacement coming up and want to check out the shoe
shimming that Dennis mentions.  I have a feeling the temp difference
on the rears is due to the one wheel cylinder pulling back.

I let it cool completely and pulled one wheel off and took a look at
the pads.  They seemed to be glazed again.  Put them back and drove
on an errand and they seemed fine in terms of noise and pedal
effort/effect ratio.  When I got home I did the temps again and they
were more even left-right than before.
Edward