[DeTomaso] brake master cyl still bad?

[pantdino at aol.com]

I have a vacuum bleeder, but find it is not as good as having a human push the pedal down in concert with opening and closing the bleeder.
This is because there is so much vacuum loss around the threads of the bleed screw that not much is left to actually suction the fluid through.  And all that leakage causes a constant stream of bubbles to appear in the bleed tubing so you have no idea if you actually still have air in the line or not.

Jim






-----Original Message-----
From: Ian Hannington <ihannington286720mi at comcast.net>
To: pantdino at aol.com; detomaso at realbig.com
Sent: Mon, Apr 19, 2010 5:01 pm
Subject: RE: [DeTomaso] brake master cyl still bad?


It seems to be really hard to get all the air out of the Pantera brake
ystem.  I had the same problem after rebuilding mine.  I finally bought a
acuum bleeder and that did the trick.  
Good luck,
an
-----Original Message-----
rom: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
ehalf Of pantdino at aol.com
ent: Sunday, April 18, 2010 3:53 AM
o: detomaso at realbig.com
ubject: [DeTomaso] brake master cyl still bad?

o after rebuilding all my calipers and switching back to DOT 4 fluid, I
ound the brake pedal would just go all the way to the floor with only mild
esistance, while making a swooshing or mechanical wheezing sound.  
 took the master cyl to the local Napa store but we were unable to identify
hich new one would replace it, so I sent it out for rebuilding.
Brought it home, bled all the lines, and the brakes are doing exactly the
ame thing-- pedal behaves in same way (engine not running).. No change in
luid levels in the reservoir, no leaks.  There was no fluid at the pushrod
nd of the m/c when I took it off before.
AFAIK there are 1.0 possibilities-- the master cyl main seals are letting
he fluid pass from one chamber to the other inside.
hich means the "rebuild" job wasn't done at all or was done poorly.
Any other ideas?
Jim

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