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Date: Thu, 10 Jan 2013 12:01:23 -0500
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: bleeding brakes
In-Reply-To: <listdigest-6004181@logan.com>
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Regarding the bleeding of brakes, the standard method of filling brake syst=
ems at automotive factories is to leave all connections tight and pull a va=
cuum at the reservoir.=A0 Then a measured quantity is added to the reservoi=
r, the vacuum released and that's it.=A0 One problem with our systems is th=
at the hoses and lines are larger than they need to be, allowing air bubble=
s to stay in place and not be "dragged along" with the fluid.=A0 I think th=
e best approach is to pull a vacuum at the reservoir.=A0 It won't "pull deb=
ris" from the wheel cylinder, as the fluid there stays put.=A0 The bubble e=
nlarges and that gives it the impetus to rise to the reservoir.=A0 Or, as R=
obert says, a pressure bleed can push the fluid fast enough to drag the air=
 with it.=A0 Except I would probably pressurize the wheel cylinder to at le=
ast push the air uphill.=A0 Either way works, though.=0AGary Casey=0A=A0=0A=
=A0=0A=0A =0A>Reverse bleeding pushes all the debris from the  wheel cylind=
er up into the master cylinder. This will be trouble in the  future.. =0A>T=
he two person method works well but you must not  wait long between the pum=
ping action at the master cylinder as any  bubble=0A>in a hose will travel =
beyond the prior pumping  action rendering the bleed useless. =0A>The best =
is the pressure bleed. A small pot is  filled with brake fluid and pressuri=
zed to 20 psi. The pot is connected to  the=0A>master cylinder reservoir. W=
hen the bleeder valve  is opened at the wheel cylinder, the fluid is pushed=
 out at a fast rate  allowing=0A>all debris and air to escape. This is the =
de-facto  standard in the auto industry and commercial aircraft. =0A>Robert=
 
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>Regarding the =
bleeding of brakes, the standard method of filling brake systems at automot=
ive factories is to leave all connections tight and pull a vacuum at the re=
servoir.&nbsp; Then a measured quantity is added to the reservoir, the vacu=
um released and that's it.&nbsp; One problem with our systems is that the h=
oses and lines are larger than they need to be, allowing air bubbles to sta=
y in place and not be "dragged along" with the fluid.&nbsp; I think the bes=
t approach is to pull a vacuum at the reservoir.&nbsp; It won't "pull debri=
s" from the wheel cylinder, as the fluid there stays put.&nbsp; The bubble =
enlarges and that gives it the impetus to rise to the reservoir.&nbsp; Or, =
as Robert says, a pressure bleed can push the fluid fast enough to drag the=
 air with it.&nbsp; Except I would probably pressurize the wheel
 cylinder to at least push the air uphill.&nbsp; Either way works, though.<=
/div><div>Gary Casey</div><div>&nbsp;</div><div><strong>&nbsp;<br></strong>=
</div><blockquote type=3D"cite"><div>=0A<style></style>=0A<div><font size=
=3D"2" face=3D"Arial">Reverse bleeding pushes all the debris from the  whee=
l cylinder up into the master cylinder. This will be trouble in the  future=
..</font></div><div><font size=3D"2" face=3D"Arial"></font> </div><div><fon=
t size=3D"2" face=3D"Arial">The two person method works well but you must n=
ot  wait long between the pumping action at the master cylinder as any  bub=
ble</font></div><div><font size=3D"2" face=3D"Arial">in a hose will travel =
beyond the prior pumping  action rendering the bleed useless.</font></div><=
div><font size=3D"2" face=3D"Arial"></font> </div><div><font size=3D"2" fac=
e=3D"Arial">The best is the pressure bleed. A small pot is  filled with bra=
ke fluid and pressurized to 20 psi. The pot is connected to  the</font></di=
v><div><font size=3D"2" face=3D"Arial">master cylinder reservoir. When the =
bleeder valve  is opened at the wheel cylinder, the fluid is pushed out at =
a fast rate  allowing</font></div><div><font size=3D"2" face=3D"Arial">all =
debris and
 air to escape. This is the de-facto  standard in the auto industry and com=
mercial aircraft.</font></div><div><font size=3D"2" face=3D"Arial"></font> =
</div><div><font size=3D"2" face=3D"Arial">Robert</font></div><div><font si=
ze=3D"2" face=3D"Arial"></font> </div></div></blockquote></div></body></htm=
l>
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