Subject: Re: [Roadsters] 69 Roadster brake master cylinder

From: Pat Horne via Datsun-roadsters <[email-masked]>
Date: Sun, 24 May 2020 10:56:09 -0500

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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: [email-masked]
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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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>&nbsp;</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>&nbsp;</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 &amp; 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>&nbsp;</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>&nbsp;</o:p></p><p class=3DMsoNormal>Peace,</p><p class=3DMs=
oNormal>Pat</p><p class=3DMsoNormal><o:p>&nbsp;</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>&nbsp;</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:[email-masked]=
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">[email-masked]</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.&nbsp;</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&nbsp;advance for your help. Art&nbsp;</p><p class=3DMsoNormal><o:=
p>&nbsp;</o:p></p></div></body></html>=

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From: Arthur Castronovo via Datsun-roadsters <[email-masked]>
Date: Sun, 24 May 2020 10:02:20 -0700

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Hi Pat -

Thank you so much for the quick reply! Really appreciate it=F0=9F=91=8D

Regards,
Art

On Sun, May 24, 2020 at 8:56 AM Pat Horne <[email-masked]> wrote:

> The purpose of bench bleeding is to get the air out of the master cylinde=
r
> before you connect it up. If you put a totally empty master cylinder 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.
>
>
>
> There are two ways to bench bleed the cylinder that I know of. One is to
> use a vacuum pump to pull the fluid into the cylinder to get the air out.
> This works pretty good but the second way works better. The second way is
> to make 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 the fluid fills the cylinder it will be put back into the reservo=
ir
> while the air escapes. The fastest way would probably be a combination of
> the two, pump first, then the recirculating lines.
>
>
>
> The =E2=80=9Cbench bleeding=E2=80=9D can be done either on the bench or i=
n the car with
> the brake lines disconnected. The biggest 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.
> *From: *Arthur Castronovo via Datsun-roadsters
> <[email-masked]>
> *Sent: *Sunday, May 24, 2020 10:28 AM
> *To: [email-masked]
> *Subject: *[Roadsters] 69 Roadster brake master cylinder
>
>
>
> Hi There. Been a while since I posted a question so I hope I=E2=80=99m do=
ing this
> correctly.
>
> I=E2=80=99m installing a new brake master cylinder on my 69 roadster. I t=
hink a
> recall seeing an article about bench priming it first. Is this necessary?
> If so, can someone share an article or instructions. Thanks in advance fo=
r
> your help. Art

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<div><div dir=3D"auto">Hi=C2=A0Pat -</div><div dir=3D"auto"><br></div><div =
dir=3D"auto">Thank you so much for the quick reply! Really appreciate it=F0=
=9F=91=8D</div><div dir=3D"auto"><br></div><div dir=3D"auto">Regards,</div>=
<div dir=3D"auto">Art</div></div><div><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr" class=3D"gmail_attr">On Sun, May 24, 2020 at 8:56 AM Pat Horne &=
lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;bord=
er-left-color:rgb(204,204,204)"><div lang=3D"EN-US" link=3D"blue" vlink=3D"=
#954F72"><div class=3D"m_-1161136092625943681WordSection1"><p class=3D"MsoN=
ormal">Art,</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"M=
soNormal">Bench priming isn=E2=80=99t necessary but quite helpful.</p><p cl=
ass=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">The purpos=
e 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 the car the=
n 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=3D"MsoNor=
mal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">There are two ways to b=
ench bleed the cylinder that I know of. One is to use a vacuum pump to pull=
 the fluid into the cylinder to get the air out. This works pretty good but=
 the second way works better. The second way is to make some short lengths =
of brake line that screw into the master cylinder &amp; are bent to have th=
e other end of the line over the reservoir so that as the fluid fills the c=
ylinder it will be put back into the reservoir while the air escapes. The f=
astest way would probably be a combination of the two, pump first, then the=
 recirculating lines. </p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p=
 class=3D"MsoNormal">The =E2=80=9Cbench bleeding=E2=80=9D can be done eithe=
r on the bench or in the car with the brake lines disconnected. The biggest=
 thing to watch for is that the brake fluid in the reservoir doesn=E2=80=99=
t get down far enough that you pull air into cylinder.</p><p class=3D"MsoNo=
rmal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Peace,</p><p class=3D"=
MsoNormal">Pat</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=
=3D"MsoNormal">We support Habitat for Humanity<u></u><u></u></p><p class=3D=
"MsoNormal">A hand UP not a hand OUT<u></u><u></u></p></div></div><div lang=
=3D"EN-US" link=3D"blue" vlink=3D"#954F72"><div class=3D"m_-116113609262594=
3681WordSection1"><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div style=
=3D"border-style:solid none none;border-top-width:1pt;padding:3pt 0in 0in;b=
order-top-color:rgb(225,225,225)"><p class=3D"MsoNormal" style=3D"border:no=
ne;padding:0in"><b>From: </b><a href=3D"mailto:[email-masked].=
net" target=3D"_blank">Arthur Castronovo via Datsun-roadsters</a><br><b>Sen=
t: </b>Sunday, May 24, 2020 10:28 AM<br><b>To: </b><a href=3D"mailto:datsun=
[email-masked]" target=3D"_blank">[email-masked]=
t</a><br><b>Subject: </b>[Roadsters] 69 Roadster brake master cylinder</p><=
/div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><p class=3D"MsoNor=
mal">Hi There. Been a while since I posted a question so I hope I=E2=80=99m=
 doing this correctly.=C2=A0</p></div><p class=3D"MsoNormal">I=E2=80=99m in=
stalling a new brake master cylinder on my 69 roadster. I think a recall se=
eing an article about bench priming it first. Is this necessary? If so, can=
 someone share an article or instructions. Thanks in=C2=A0advance for your =
help. Art=C2=A0</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div></d=
iv></blockquote></div></div>

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