That's got to be it (the caliper orientation). While I can imagine a
proportioning valve possibly giving the symptoms described, what it
sounds *exactly* like is air in the system, and if the bleed screws
aren't the highest point on the calipers as a result of your Spider
caliper swap it's going to be hard to get the air out.
-Joe
At 5:44 AM +0000 6/3/10, alfa-digest wrote:
Date: Wed, 02 Jun 2010 22:44:02 -0700
From: "Wayne Abbott" <[email protected]>
Subject: [alfa] Re: alfa-digest V10 #2277
Brian,
I would guess one of the obvious, I know, duh! Either you do still have air
in the system or you are the unluckiest person alive with master cylinders.
I am leaning towards a lot of air in the system.
I have heard of replacing the rear transaxle calipers with spider calipers,
I've just not seen it. When the spider calipers are installed is the bleed
screw in a position to allow all the air out of the calipers? The transaxle
calipers go pretty much straight across the top don't they? And the spider
rears are pretty much at 3 and 9 o'clock aren't they? I'm 2100 miles from
my Alfetta and Spider so I can't go look.
I would remove the rear calipers and hang or hold them in a bleeder-up
position approximate to their normal position on a spider with a block of
wood or something to fill the space where the rotor goes and try to bleed
them that way and see if you get a pedal. With a block of wood or something
solid in the caliper you shouldn't have to remount them to get pedal feel.
From my limited experience every time I have had air in the system the pedal
would pump up and hold. If a quick stab gave a firm pedal and then holding
the pedal down with gentle steady pressure resulted in a change in the pedal
position then the master was no good.
Engine off, pump the pedal, does it pump up to a hard pedal and then while
holding it start the car. Does the pedal go to normal? booster is working.
For your vacuum drop check, there should be a check valve in line, is that
good? I don't know if or how that might affect the test.
If one of your previous master cylinders was bad did it leak into the
booster? If the booster is full of fluid I believe I remember that creating
a hard pedal with little braking, but could be wrong on that.
Good Luck,
Let us know what solves it.
Wayne
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