[Vwdiesel] bad brakes on 2001 Jetta

[Tad]

I tried bleeding by vacuum once using a mity-vac... all I succeeded in
doing was sucking air past the bleeder threads.

Since then I've just used the cheapo one-man system like Mark described,
with the little bottle and one-way valve.  Works fine, but lots of running
back and forth :)


On Mon, Jul 8, 2013 at 8:36 PM, Mark Shepherd <mark at shepher.fsnet.co.uk>wrote:

> Interesting discussion.
> I've never used a powered/suction system, although I did make a failed bid
> on a Gunson's one recently. I naturally started on the 2 man system of
> holding
> pedal down.
> I moved on to a length of clear tube arching up and then down into a
> bottle. On the end of the tube is a ball bearing stuffed into the end.
> About 1/2" back up
> the tube is a small bore hole.Pushed over the tube is a 'rubber' tube
> fitting tightly over the clear tube such that it goes say an inch beyond
> the hole back up
> the line, creating a one-way valve that is biased to drip conveniently out
> the end under pressure.
>
> I suspect that one factor for the brake failure s when bleeding may be
> more so on brakes that have been dormant for extended periods rather than
> just old
> but used daily. I don't think that full strokes are necessary as long as
> the fluid is moving.Sufficient speed to overcome climbing air, although if
> that is an issue
> I can't see why it doesn't climb during use and self bleed... I swear my
> Quantum does this to some extent! Can seals still be purchased? In the old
> days I
> have packed behind the master cylinder seal to increase tension against
> the bore, and added a secondary seal behind the old one on British stuff.
>
> To find out what is failing, I use a carb balancing vacuum gauge on the
> line. Check for max vac, response to pushes , overnight leaks etc Weak mk2
> type
> vane pumps can easily be improved by rotating the vanes. There are 3 spare
> 'new edges' enough to last some 60-to 75 years!
>
> Mark
>
> Does anyone have a do it yourself tire bead breaker they can recommend?
>
> ========================================
> Message Received: Jul 08 2013, 05:54 PM
> From: "Kneale Brownson"
> To: "Rolf Pechukas"
> Cc: "vwdiesel at vwfans.com"
> Subject: Re: [Vwdiesel] bad brakes on 2001 Jetta
>
> No more than 15 lbs. google home made brake bleeder.
>
> Sent from my iPhone
>
> On Jul 8, 2013, at 9:12 AM, Rolf Pechukas  wrote:
>
> > OK, so you guys are fighting about whether pedal pushing or power
> bleeding is preferable
> >
> > but in either case, you are using pressure to *push* fluid out at the
> bleed nipples
> >
> > no one is advocating vacuum bleeding - suction at the bleed nipples -
> which is what my mechanic was doing and I was questioning (was sucking air
> past
> the threads, and you could never tell whether you had solid fluid or not)
> >
> > seems to me, ideal practice would be: constant compressor-based pressure
> at the reservoir, steady 25 lbs or whatever, pushing an extra 'column' of
> brake fluid attached to the reservoir, so you don't ever run dry
> >
> > bleed nipples in order, then stomp pedal to drive any bubbles toward
> nipples, then bleed in order again, repeat until all air gone
> >
> > if I had the car, I'd do something like that
> >
> > any advice on how to suggest a pressure-based bleed to the mechanic? I
> don't want to pay him for the work and then have to re-do it myself - too
> much
> other stuff going on
> >
> > thanks,
> >
> > Rolf in MA
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