[T3] I want to change my brake fluid it's been a while? 73 SB

[Jim Adney]

If you want to get as much old fluid as possible out of the system, 
you're committed to letting a lot of air in. There's no way around 
that.

Once you've got as much old fluid out as possible, you can just 
gravity bleed, which works great. Just don't get in a hurry. It's a 
good way to do this when you're working alone. It gives you plenty of 
time to make sure the reservoir stays full.

I would pump as much out of the regular bleeders as you can, until 
you suck air into the MC. Then open the bottom bleeders and let the 
calipers drain. Let them drain while you do something else for a half 
hour.

Then close the bottom bleeders and fill the reservoir. Close the 
bleeders on the LF, LR, and RR. Watch the RF until fluid starts 
coming out, then close that valve.

Open the LF and watch it. Check the reservoir.

Repeat for the rears.

Check for good pedal. If it's still soft, pump a few times, to drive 
bubbles to the top of the wheels, and let more fluid/air out at each 
wheel.

On 13 May 2016 at 11:24, William J wrote:

> Just so I've got this right. If I remove most of the fluid from the 
> reservoir then strarting with the right front caliper I should open the 
> lower bleeder  and this will gravity drain all the fluid from both pistons 
> or do I need to also open the top bleeder and of course maintain the 
> reservoir level ? Then do the left front then R rear the L rear each one at 
> a time? So if I keep the reservoir full this will not only flush or drain 
> out all the old fluid and also not introduce air into the system ? I'm 
> calling this drain/ gravity bleed , I have the time. If for some reason air 
> is introduced then I go to the hose and jar method ? I have read that  air 
> can be pulled in through the bleeder screw threads or is this only an issue 
> if one backs out the bleeders more than cracking them say a 1/4 or 1/2 turn.
> 
> William
> ----- Original Message ----- 
> From: "Dave Hall" <dave at hallvw.clara.co.uk>
> To: <type3 at vwtype3.org>
> Sent: Friday, May 13, 2016 5:30 AM
> Subject: Re: [T3] I want to change my brake fluid it's been a while? 73 SB
> 
> 
> > I've a simple piece of rubber pressure tubing that has a screw in the 
> > lower
> > end, and a slit cut with a Stanley knife (eg) which fits on a bleed screw
> > and acts as a one way valve.  Press on the pedal and the fluid squirts out
> > of the slit, without allowing air back in.  Good for single-handed 
> > bleeding,
> > but rather slow for changing fluid.
> >
> > Dave
> > UK VW Type 3&4 Club
> > ===================
> >
> >
> >
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-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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