Subject: Re: [Healeys] Disk brake conversion

From: Michael Salter <[email-masked]>
Date: Mon, 29 Aug 2016 14:31:27 -0400

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Hi Ross,
Before going any further I would recommend assessing what you have.
If you are not intending to use a brake servo then best to model your new
system on that of the pre BJ8 disc brake system.
Is the total piston area of the calipers that you have chosen larger or
smaller than that of the the Girling 14 calipers that those cars used. I
forget the diameter of the pistons in those calipers, it may be 1.4", but
I'm sure someone on the list will have that info.
If the piston *area* is similar say within 10% then they should be
satisfactory with the 5/8" bore master cyl  used in those cars although the
1" rear cylinders of the 100/6 may have resulted in excessive rear braking.
 *BUT* a change from 1" (0.79 sq. in) to 5/8" (0.30 sq. in), i.e less that
40% area, IS SERIOUS OVERKILL and should definitely have moved the bias to
the front.
You need to do the calculations before changing things..
Michael S
BN1 #174

On Mon, Aug 29, 2016 at 11:47 AM, Ross <[email-masked]> wrote:

> Gentlemen
>
> I have installed a front disk brake conversion on my 58 BN6. The brake ki=
t
> was supplied with the uprated calipers, which use the larger BJ8 pads
> (vendor description).
>
> The system was bled and the pedal firm. Initial drives indicate very
> little front brake support.
>
> The next recommended move was to replace the rear drum brake wheel
> cylinders, from 1=E2=80=9D to 5/8=E2=80=9D. That was done with no recogni=
zable improvement.
>
> The next move is to switch out the master cylinder from =C2=BE=E2=80=9D  =
to 5/8=E2=80=9D as per
> the non-servo disk brake BN7.
>
>
>
> In this case should the push rod length be changed as well to get
> increased fluid into the front disks?
>
> Or is a proportioning valve a better way to go?
>
>
>
> Regards
>
> Ross Maylor
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
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>
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> options/healeys/[email-masked]
>
>
>

--=20
*If you can't fix it with a hammer, you've got an electrical problem.*

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Ross,<br></div><div class=3D"gmail_def=
ault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Before=
 going any further I would recommend assessing what you have.<br></div><div=
 class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font=
-size:small">If you are not intending to use a brake servo then best to mod=
el your new system on that of the pre BJ8 disc brake system. <br></div><div=
 class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font=
-size:small">Is the total piston area of the calipers that you have chosen =
larger or smaller than that of the the Girling 14 calipers that those cars =
used. I forget the diameter of the pistons in those calipers, it may be 1.4=
&quot;, but I&#39;m sure someone on the list will have that info.<br></div>=
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:small">If the piston <u>area</u> is similar say within 10% then t=
hey should be satisfactory with the 5/8&quot; bore master cyl=C2=A0 used in=
 those cars although the 1&quot; rear cylinders of the 100/6 may have resul=
ted in excessive rear braking.<br>=C2=A0<u><b>BUT</b></u> a change from 1&q=
uot; (0.79 sq. in) to 5/8&quot; (0.30 sq. in), i.e less that 40% area, IS S=
ERIOUS OVERKILL and should definitely have moved the bias to the front.<br>=
</div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-=
serif;font-size:small">You need to do the calculations before changing thin=
gs..<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans =
ms,sans-serif;font-size:small">Michael S<br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:comic sans ms,sans-serif;font-size:small">BN1 #174=
<br><br></div><div class=3D"gmail_default" style=3D"font-family:comic sans =
ms,sans-serif;font-size:small">=C2=A0<br></div><div class=3D"gmail_default"=
 style=3D"font-family:comic sans ms,sans-serif;font-size:small"><br></div><=
div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;f=
ont-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family=
:comic sans ms,sans-serif;font-size:small">=C2=A0<br></div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Aug 29, 2016 at 11:=
47 AM, Ross <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" targe=
t=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex"><div link=3D"#0563C1" vlink=3D"#954F72" lang=3D"EN-US"><div><p c=
lass=3D"MsoNormal">Gentlemen<u></u><u></u></p><p class=3D"MsoNormal">I have=
 installed a front disk brake conversion on my 58 BN6. The brake kit was su=
pplied with the uprated calipers, which use the larger BJ8 pads (vendor des=
cription).<u></u><u></u></p><p class=3D"MsoNormal">The system was bled and =
the pedal firm. Initial drives indicate very little front brake support. <u=
></u><u></u></p><p class=3D"MsoNormal">The next recommended move was to rep=
lace the rear drum brake wheel cylinders, from 1=E2=80=9D to 5/8=E2=80=9D. =
That was done with no recognizable improvement.<u></u><u></u></p><p class=
=3D"MsoNormal">The next move is to switch out the master cylinder from =C2=
=BE=E2=80=9D =C2=A0to 5/8=E2=80=9D as per the non-servo disk brake BN7. =C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0<wbr>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<wbr>=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0<wbr>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<wbr>=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <u></u><u></u></p><p class=3D"Ms=
oNormal">In this case should the push rod length be changed as well to get =
increased fluid into the front disks? <u></u><u></u></p><p class=3D"MsoNorm=
al">Or is a proportioning valve a better way to go?<u></u><u></u></p><p cla=
ss=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Regards <u>=
</u><u></u></p><p class=3D"MsoNormal">Ross Maylor<u></u><u></u></p></div></=
div><br>______________________________<wbr>_________________<br>
rer" target=3D"_blank">http://www.team.net/donate.<wbr>html</a><br>
Archive: <a href=3D"http://www.team.net/archive" rel=3D"noreferrer" target=
=3D"_blank">http://www.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums" rel=3D"noreferrer" target=3D=
"_blank">http://www.team.net/forums</a><br>
<br>
<a href=3D"mailto:[email-masked]">[email-masked]</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/<wbr>listinfo/healeys</a=
><br>
<br>
s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/<wbr>options/healeys/michaelsalter@<wbr>gmail.com</a><br=
<br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div d=
ir=3D"ltr"><i><font size=3D"2"><span style=3D"color:black">If you can&#39;t=
 fix it with a hammer, you&#39;ve got an electrical problem.</span></font><=
/i><br><br><div></div><div></div><div></div></div></div></div></div>
</div>

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_______________________________________________
Archive: http://www.team.net/archive

[email-masked]
http://autox.team.net/mailman/listinfo/healeys

--===============3012432932587022372==--

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From: "Simon Lachlan" <[email-masked]>
Date: Mon, 29 Aug 2016 20:06:38 +0100

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Wasn=92t this very topic covered quite recently?

Some very precise, and doubtless satisfactory,  answers emerged.

Something to do with the shape of the caliper militating against getting =
the
air out too easily? Can=92t remember....

I=92ve got BJ8 size calipers in my MkII BT7 but they came out of a Ford,
Escort I think.

Simon

=20

From: Healeys [mailto:[email-masked]] On Behalf Of Ross
Sent: 29 August 2016 16:47
To: [email-masked]
Subject: [Healeys] Disk brake conversion

=20

Gentlemen

I have installed a front disk brake conversion on my 58 BN6. The brake =
kit
was supplied with the uprated calipers, which use the larger BJ8 pads
(vendor description).

The system was bled and the pedal firm. Initial drives indicate very =
little
front brake support.=20

The next recommended move was to replace the rear drum brake wheel
cylinders, from 1=94 to 5/8=94. That was done with no recognizable =
improvement.

The next move is to switch out the master cylinder from =BE=94  to =
5/8=94 as per
the non-servo disk brake BN7.

In this case should the push rod length be changed as well to get =
increased
fluid into the front disks?=20

=20

Regards=20

Ross Maylor

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB =
link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Wasn&#8217;t this very =
topic covered quite recently?<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Some very precise, and =
doubtless satisfactory, =A0answers emerged.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Something to do with the =
shape of the caliper militating against getting the air out too easily? =
Can&#8217;t remember....<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>I&#8217;ve got BJ8 size calipers in my MkII BT7 =
but they came out of a Ford, Escort I think.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Simon<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Healeys =
[mailto:[email-masked]] <b>On Behalf Of =
</b>Ross<br><b>Sent:</b> 29 August 2016 16:47<br><b>To:</b> =
[email-masked]<br><b>Subject:</b> [Healeys] Disk brake =
conversion<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-US>Gentlemen<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>I have installed a front disk brake conversion on my 58 =
BN6. The brake kit was supplied with the uprated calipers, which use the =
larger BJ8 pads (vendor description).<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>The system was bled and the pedal =
firm. Initial drives indicate very little front brake support. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US>The next =
recommended move was to replace the rear drum brake wheel cylinders, =
from 1&#8221; to 5/8&#8221;. That was done with no recognizable =
improvement.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>The next move is to switch out the master cylinder from =
=BE&#8221; &nbsp;to 5/8&#8221; as per the non-servo disk brake BN7. =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>In this case should the push rod =
length be changed as well to get increased fluid into the front disks? =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US>Or is a =
proportioning valve a better way to go?<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Regards <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Ross =
Maylor<o:p></o:p></span></p></div></body></html>
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[email-masked]

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From: Chris Scholz <[email-masked]>
Date: Mon, 29 Aug 2016 21:11:36 +0000

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--_000_F6584B7080354F93A381BEE7EB289120visioncenterpccom_
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I installed the Denis Welch front disc conversion on my 1959 BN4 and instal=
led an aftermarket pro portioning valve from Wilwood.  This is a safer set =
up in general.

Sent from my iPhone
Chris Scholz OD

>> wrote:

Gentlemen
I have installed a front disk brake conversion on my 58 BN6. The brake kit =
was supplied with the uprated calipers, which use the larger BJ8 pads (vend=
or description).
The system was bled and the pedal firm. Initial drives indicate very little=
 front brake support.
The next recommended move was to replace the rear drum brake wheel cylinder=
s, from 1" to 5/8". That was done with no recognizable improvement.
The next move is to switch out the master cylinder from (3/4)"  to 5/8" as =
per the non-servo disk brake BN7.
In this case should the push rod length be changed as well to get increased=
 fluid into the front disks?
Or is a proportioning valve a better way to go?

Regards
Ross Maylor

visioncenterpc.com

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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
</head>
<body dir=3D"auto">
<div>I installed the Denis Welch front disc conversion on my 1959 BN4 and i=
nstalled an aftermarket pro portioning valve from Wilwood. &nbsp;This is a =
safer set up in general.&nbsp;<br>
<br>
Sent from my iPhone
<div>Chris Scholz OD</div>
</div>
<div><br>
On Aug 29, 2016, at 1:14 PM, Ross &lt;<a href=3D"mailto:[email-masked]">r=
[email-masked]</a>&gt; wrote:<br>
<br>
</div>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Gentlemen<o:p></o:p></p>
<p class=3D"MsoNormal">I have installed a front disk brake conversion on my=
 58 BN6. The brake kit was supplied with the uprated calipers, which use th=
e larger BJ8 pads (vendor description).<o:p></o:p></p>
<p class=3D"MsoNormal">The system was bled and the pedal firm. Initial driv=
es indicate very little front brake support.
<o:p></o:p></p>
<p class=3D"MsoNormal">The next recommended move was to replace the rear dr=
um brake wheel cylinders, from 1&#8221; to 5/8&#8221;. That was done with n=
o recognizable improvement.<o:p></o:p></p>
<p class=3D"MsoNormal">The next move is to switch out the master cylinder f=
rom &frac34;&#8221; &nbsp;to 5/8&#8221; as per the non-servo disk brake BN7=
. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal">In this case should the push rod length be changed a=
s well to get increased fluid into the front disks?
<o:p></o:p></p>
<p class=3D"MsoNormal">Or is a proportioning valve a better way to go?<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards <o:p></o:p></p>
<p class=3D"MsoNormal">Ross Maylor<o:p></o:p></p>
</div>
</div>
</blockquote>
<blockquote type=3D"cite">
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