[T3] Brake Pedal Sticking (update)

[Dave Hall]

If the bleed/drain valves only drip, something is stopping fluid getting
out.  Fluid should be able to dribble out from the reservoir, through the
master cylinder and out of the brake hose.  
Maybe the hoses are blocking - they can collapse internally when old.  That
will stop the pedal moving down when the bleed screws are open.

Check the hoses before pulling apart the m/c.
Is there any free-play on the brake pedal?  You may be blocking the
compensation ports, which might stop fluid refilling the hoses.

Dave.
UK VW Type 3&4 Club
===================

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of J. Jonik
Sent: 31 July 2013 00:18
To: type3-vwtype3.org at lists.vwtype3.org
Subject: Re: [T3] Brake Pedal Sticking (update)





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 From: "type3-vwtype3.org-request at lists.vwtype3.org"
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Sent: Tuesday, July 30, 2013 4:44 PM
Subject: type3-vwtype3.org Digest, Vol 34, Issue 29
 

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Since the last message, I put on the "new" rotor. None of the old Piston
Retainer Plates (incl. some of my old spares) wanted to clip into position.
I put in a different caliper that I knew had two movable pistons AND two
valves that actually opened. Turned out that one of the pistons could not be
pressed all the way in, just most of the way, so I had to use a thinner,
less-than-new (but not bad) brake pad on one side.  It's all together.
 BUT...bleeding resulted in just drips, no squirt, from the upper valve, and
no juice at all from lower. And, the brake pedal cannot be pushed all the
way to the floor even with both valves open.
  Is this Proof Positive that the Master Cylinder is messed up?

Message: 1
Date: Tue, 30 Jul 2013 12:46:36 -0700 (PDT)
From: "J. Jonik" <j_jonik at yahoo.com>
To: Type 3 <type3-vwtype3.org at lists.vwtype3.org>
Subject: [T3] Brake Pedal Sticking...
Message-ID:
    <1375213596.82068.YahooMailNeo at web126003.mail.ne1.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

Sqbk 71 Std FI--

Twice or so yesterday, the brake pedal stuck in down position....as if some
suction was holding it. That didn't happen again right away, but a few miles
later (in stop-and-go city traffic).

I haven't crawled under yet to look for suspicious things, but did plan to
put a nicely cleaned-up and re-cut rotor on the front right...where some
braking issues seem to be happening. That is...in heavy-breaking moments,
there's some rough wobbling.?? Last week or so, when checking out the area,
the caliper seemed to be ok (both pistons were able to be pushed back in
with a flat pry bar without undue effort).? And...we discussed the Piston
Retainer Plates here.

But...re/ the brake pedal sticking.? Q.? Could that be connected to that
front right rotor and caliper?? Or, can a sticking pedal only be caused by
something funny in Master Cylinder?
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