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Art,
Bench priming isn=E2=80=99t necessary but quite helpful.
The purpose of bench bleeding is to get the air out of the master cylinder =
before you connect it up. If you put a totally empty master cylinder into t=
he car then try bleeding the brakes you will pump a lot of air into the sys=
tem which will waste a lot of fluid before all the air is out.=20
There are two ways to bench bleed the cylinder that I know of. One is to us=
e a vacuum pump to pull the fluid into the cylinder to get the air out. Thi=
s works pretty good but the second way works better. The second way is to m=
ake some short lengths of brake line that screw into the master cylinder & =
are bent to have the other end of the line over the reservoir so that as th=
e fluid fills the cylinder it will be put back into the reservoir while the=
air escapes. The fastest way would probably be a combination of the two, p=
ump first, then the recirculating lines.=20
The =E2=80=9Cbench bleeding=E2=80=9D can be done either on the bench or in =
the car with the brake lines disconnected. The biggest thing to watch for i=
s that the brake fluid in the reservoir doesn=E2=80=99t get down far enough=
that you pull air into cylinder.
Peace,
Pat
We support Habitat for Humanity
A hand UP not a hand OUT
From: Arthur Castronovo via Datsun-roadsters
Sent: Sunday, May 24, 2020 10:28 AM
To: datsun-roadsters@autox.team.net
Subject: [Roadsters] 69 Roadster brake master cylinder
Hi There. Been a while since I posted a question so I hope I=E2=80=99m doin=
g this correctly.=C2=A0
I=E2=80=99m installing a new brake master cylinder on my 69 roadster. I thi=
nk a recall seeing an article about bench priming it first. Is this necessa=
ry? If so, can someone share an article or instructions. Thanks in=C2=A0adv=
ance for your help. Art=C2=A0
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72"><div cla=
ss=3DWordSection1><p class=3DMsoNormal>Art,</p><p class=3DMsoNormal><o:p>&n=
bsp;</o:p></p><p class=3DMsoNormal>Bench priming isn=E2=80=99t necessary bu=
t quite helpful.</p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMs=
oNormal>The purpose of bench bleeding is to get the air out of the master c=
ylinder before you connect it up. If you put a totally empty master cylinde=
r into the car then try bleeding the brakes you will pump a lot of air into=
the system which will waste a lot of fluid before all the air is out. </p>=
<p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>There are tw=
o ways to bench bleed the cylinder that I know of. One is to use a vacuum p=
ump to pull the fluid into the cylinder to get the air out. This works pret=
ty good but the second way works better. The second way is to make some sho=
rt lengths of brake line that screw into the master cylinder & are bent=
to have the other end of the line over the reservoir so that as the fluid =
fills the cylinder it will be put back into the reservoir while the air esc=
apes. The fastest way would probably be a combination of the two, pump firs=
t, then the recirculating lines. </p><p class=3DMsoNormal><o:p> </o:p>=
</p><p class=3DMsoNormal>The =E2=80=9Cbench bleeding=E2=80=9D can be done e=
ither on the bench or in the car with the brake lines disconnected. The big=
gest thing to watch for is that the brake fluid in the reservoir doesn=E2=
=80=99t get down far enough that you pull air into cylinder.</p><p class=3D=
MsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Peace,</p><p class=3DMs=
oNormal>Pat</p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNorm=
al>We support Habitat for Humanity<o:p></o:p></p><p class=3DMsoNormal>A han=
d UP not a hand OUT<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p=
><div style=3D'mso-element:para-border-div;border:none;border-top:solid #E1=
E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal style=3D'border:=
none;padding:0in'><b>From: </b><a href=3D"mailto:datsun-roadsters@autox.tea=
m.net">Arthur Castronovo via Datsun-roadsters</a><br><b>Sent: </b>Sunday, M=
ay 24, 2020 10:28 AM<br><b>To: </b><a href=3D"mailto:datsun-roadsters@autox=
.team.net">datsun-roadsters@autox.team.net</a><br><b>Subject: </b>[Roadster=
s] 69 Roadster brake master cylinder</p></div><p class=3DMsoNormal><o:p>&nb=
sp;</o:p></p><div><p class=3DMsoNormal>Hi There. Been a while since I poste=
d a question so I hope I=E2=80=99m doing this correctly. </p></div><p =
class=3DMsoNormal>I=E2=80=99m installing a new brake master cylinder on my =
69 roadster. I think a recall seeing an article about bench priming it firs=
t. Is this necessary? If so, can someone share an article or instructions. =
Thanks in advance for your help. Art </p><p class=3DMsoNormal><o:=
p> </o:p></p></div></body></html>=
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