[T3] bleeding brakes question

[crash 69]

I'm a little confused on the gravity system.  How do you get the air bubbles
out?  Please explain the procedure in a little more detail. I've always used
a helper.

Many thanks!
Dan

PS: having bled my single circuit ('65) many times, I can say the only way
that works is:

RR
LR
RF
LF
Yes, it's LHD


On Mon, Aug 1, 2011 at 5:09 AM, Dave Hall <dave at hallvw.clara.co.uk> wrote:

> The specific instruction in the VW Factory literature is to do the front
> circuit first on the dual circuit brakes.
>
> This is to ensure there is resistance from the front circuit to allow the
> rear circuit to be bled.  I assume this applies to bleeding by pumping the
> pedal.  It may not matter if you use a pressure bleeder on the reservoir.
>
> Whether to do the left or right wheel first would depend on which side the
> steering wheel is.  LHD would be the right wheel first; RHD would be left -
> ie the one further from the master cylinder.
>
> I thought single-circuit brakes were always done furthest first, which
> would
> be passenger rear, driver rear, passenger front, driver front.
>
> As Jim says, they don't usually seem to give much trouble, though sometimes
> I suspect that air gets in the bleed screw if it's opened too much.  Any
> problem of that nature can be solved by having a helper push on the pedal,
> and only open the screw momentarily when there's pressure on the fluid.
> Just raising the end you're doing can help if they're being stubborn to
> bleed.
>
> Most of us use a simple tube with or without a one-way valve.  I use a
> rubber tube with a blocked end and a slit in the side, with a collecting
> bottle and hang it on the bleed screw.  No real cost and has worked fine
> for
> decades without a need for a helper!
>
> 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 Jim
> Adney
> Sent: 01 August 2011 05:46
> To: type3 at vwtype3.org
> Subject: Re: [T3] bleeding brakes question
>
> On 31 Jul 2011 at 16:22, Bryon Garvin wrote:
>
> > On a dual circuit MC, it wouldn't matter if you bled your brakes by
> > starting in the front vs rear, or vice versa, correct?  I have
> > sometimes heard of starting at a particular wheel and going in some
> > specific order.  But seems to me the circuits are independent and it
> wouldn't matter.
>
> I've wondered about this for years, but never come to a sound conclusion.
> The only thing I think helps is to do the RR before the LR. If I really
> thought hard about it, I would probably do
>
> RR
> LR
> LF
> RF
>
> But it really doesn't seem to matter if you're willing to go around a
> second
> time. And if you do it by gravity and just let it take its own time, it
> doesn't seem to matter at all. Almost any pattern works as long as you
> don't
> let the reservoir go dry and suck air into the MC.
> If you do that, you get to start all over again.
>
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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