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

[William J]

Instead of pumping the pedal to get the old fuild out is it possible just to 
crack the RF lower bleeder with the top one open and keep adding  fluid to 
the reservoir so no air enters the system ? Won't that drain all the old 
fluid out or is there some reason the master won't allow this without 
pumping? Then I can move to the LF and then R rear and then L rear. I just 
don't feel comfortable pumping and letting air in with the old master and 
calipers .

 I have watched a few videos that show it being done this way and they 
remove most of the old reservoir fluid and top off new and when the old 
fuild enters a jar through a hose you can see the old dark fluid , empty the 
jar and continue on until you see clean fluid coming out.

William
----- Original Message ----- 
From: "Jim Adney" <jadney at VWType3.org>
To: <type3 at vwtype3.org>
Sent: Friday, May 13, 2016 2:03 PM
Subject: Re: [T3] I want to change my brake fluid it's been a while? 73 SB


> 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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>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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