Only do one wheel at a time so you can look at the undisturbed side when
you become confused during re-assembly. Once you have all good parts and
the brakes are working again, make a plan to bleed and flush the brakes once
every year or two, this will prolong the onset of this problem again. The
little pipes between front pistons are a particular pain in the butt to
re-install correctly, and if you can afford new ones, and a set of stainless
braided
flex lines, by all means spend this money. Have the proper flare nut wrench
and
plenty of PB-Blaster on hand.
Good Luck!
Jim
Chesapeake Virginia
>From: "John F Sandhoff" <sandhoff@csus.edu>
>Reply-To: "John F Sandhoff" <sandhoff@csus.edu>
>To: "David R. Conrad" <conrad1@gte.net>
>CC: datsun-roadsters@autox.team.net
>Subject: Re: Front Disc Brake Cylinders
>Date: Tue, 24 Feb 2004 11:55:13 -0800
>
> > Before "getting into" the process of correcting a minor leak...
>
>Ain't no such thing as a minor leak :-)
>Likely, if you have any problem at one cylinder, you've got
>problems waiting to happen at all the others :-(. The system
>builds up crud in all corners, and then disturbing that crud
>causes problems to surface. This is especially true when changing
>pads (something my car needs, but I know what'll happen. As
>the piston travels outward, the cylinder wall behind it starts
>pitting and deteriorating. Then with new pads, the pistons are
>pushed back into the now-damaged area, and presto - instant leak.
>
> > I would appreciate the answer to the difference between the
> > inner and outer cylinders.
>
>Sure. Quick answer: They're different :-) (read on)
>
> > While "I'm at it", I plan to replace the steel tubing
> > at each front wheel
>
>While you're at it, carefully remove the plastic covering. The
>original lines will corrode under that protective covering and
>fail without prior warning. Been there.
>
> > It is the one which has a "V" shaped seat at the bottom of one
> > bore, and what, might be described as a "W" shaped seat, at the
> > bottom of the other bore.
>
>The 'V' seat is ISO. That's what the crossover tube screws into.
>It's also what the bleeder valve screws into (with a BB in there,
>which tends to rust and pit and then refuse to properly seal again.
>In other words, plan on replacing that BB any time you bleed the
>brakes).
>
>If I recall correctly, the bleeder is on the inside and the flex hose
>attaches to the outside (The flex connector is the only 'W' seat).
>So assuming I'm correct, the outer cylinder has one 'V' on the
>top for the tube, one 'W' on the bottom for the flex line. The inner
>cylinder has two 'V''s, lower for the tube and upper for the bleeder.
>
>-- John
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