This is a multi-part message in MIME format.
--===============9169242896098756990==
boundary="------------L0vH6yTJPe7HCSClvrslcikm"
Content-Language: en-US
This is a multi-part message in MIME format.
--------------L0vH6yTJPe7HCSClvrslcikm
Content-Transfer-Encoding: 8bit
Theoretically, I suppose. The servo has both a 'slave' cylinder, driven
by the M/C, which gates atmospheric air or engine vacuum to the large
canister for braking assist or normal running, respectively, and a
'master' cyl. that provides boosted pressure to the wheel cyls. courtesy
of the air/vacuum pressure differential. A bad seal on the master cyl.
in the servo /might /cause something similar, though I've not heard of
this happening, so I can't say what the symptoms would be (though it
would likely result in really poor braking and possibly a squishy
pedal). Air in the system or an issue in the M/C is more likely. The
most common failure of the servo I've seen or heard of is from the
'gland' seal that seals the piston shaft from the vacuum/air cylinder;
when it hardens, cracks or tears brake fluid will be sucked into the
intake manifold and you'll have a new pope.
bs
On 5/21/2025 6:00 AM, warthodson@aol.com wrote:
> Is it possible for the brake booster to produce these symptoms?
> Gary Hodson
>
> On Tuesday, May 20, 2025 at 11:08:52 PM CDT, Bob Spidell via Healeys
> <healeys@autox.team.net> wrote:
>
>
> I drove my BJ8 over 2,000 miles on a road trip with a similar problem,
> though it was more consistent. On teardown of the M/C I found that the
> seal on the 'foot valve' was damaged. This is a seal that closes the
> feed line to the reservoir when brakes are applied. Simple test: Have
> someone work the brakes as you closely watch the fluid level in the
> reservoir; if it rises or ripples when brakes are applied that's your
> problem.
>
> On 5/20/2025 1:20 PM, Richard Antal via Healeys wrote:
> Greetings Healeyphiles,
> Â Â Â Â After a long winter's rest, I drove my BJ8 for the first time
> this year and noticed immediately that I had to depress the brake
> pedal far down before braking began, but if I pumped the pedal a few
> times the brake pedal commenced functioning more promptly. This
> improvement was fleeting but reproducible. The brake fluid reservoir
> is topped off. What might be the cause and solution of this problem.
> Thanks for all help.
> rich antal
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/healeys
> http://autox.team.net/archive/healeys
>
> Healeys@autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/warthodson@aol.com
>
--------------L0vH6yTJPe7HCSClvrslcikm
Content-Transfer-Encoding: 8bit
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
Theoretically, I suppose. The servo has both a 'slave' cylinder,
driven by the M/C, which gates atmospheric air or engine vacuum to
the large canister for braking assist or normal running,
respectively, and a 'master' cyl. that provides boosted pressure to
the wheel cyls. courtesy of the air/vacuum pressure differential. A
bad seal on the master cyl. in the servo <i>might </i>cause
something similar, though I've not heard of this happening, so I
can't say what the symptoms would be (though it would likely result
in really poor braking and possibly a squishy pedal). Air in the
system or an issue in the M/C is more likely. The most common
failure of the servo I've seen or heard of is from the 'gland' seal
that seals the piston shaft from the vacuum/air cylinder; when it
hardens, cracks or tears brake fluid will be sucked into the intake
manifold and you'll have a new pope. <br>
<br>
bs<br>
<br>
<div class="moz-cite-prefix">On 5/21/2025 6:00 AM,
<a class="moz-txt-link-abbreviated"
href="mailto:warthodson@aol.com";>warthodson@aol.com</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:393242652.563944.1747832437925@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydp86a88018yahoo-style-wrap"
style="font-family:Comic Sans MS, sans-serif;font-size:16px;">
<div dir="ltr" data-setdir="false">Is it possible for the brake
booster to produce these symptoms? </div>
<div dir="ltr" data-setdir="false">Gary Hodson </div>
<div><br>
</div>
</div>
<div id="ydp1da3602fyahoo_quoted_8754888948"
class="ydp1da3602fyahoo_quoted">
<div class="ydp1da3602fyahoo-style-wrap"
style="font-family:Comic Sans MS, sans-serif;font-size:16px;">
<div
style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div class="ydp1da3602fquoted-text-header"> On Tuesday, May
20, 2025 at 11:08:52 PM CDT, Bob Spidell via Healeys
<a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a> wrote:
</div>
</div>
<div
style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;border-left: 1px solid
#ccc;padding-left: 8px;margin: 0px 0px 0px 8px"
class="ydp1da3602finline_reply_quote_container"
data-split-quote-node="true">
<div><br>
</div>
<div><br>
</div>
<div>
<div id="ydp1da3602fyiv6860857387">
<div> I drove my BJ8 over 2,000 miles on a road trip
with a similar problem, though it was more consistent.
On teardown of the M/C I found that the seal on the
'foot valve' was damaged. This is a seal that closes
the feed line to the reservoir when brakes are
applied. Simple test: Have someone work the brakes as
you closely watch the fluid level in the reservoir; if
it rises or ripples when brakes are applied that's
your problem.<br clear="none">
<br clear="none">
<div id="ydp1da3602fyiv6860857387yqt79954"
class="ydp1da3602fyiv6860857387yqt3068550861">
<div class="ydp1da3602fyiv6860857387moz-cite-prefix">On
5/20/2025 1:20 PM, Richard Antal via Healeys
wrote:<br clear="none">
</div>
<blockquote type="cite"> </blockquote>
</div>
</div>
<div id="ydp1da3602fyiv6860857387yqt61977"
class="ydp1da3602fyiv6860857387yqt3068550861">
<div>
<div
style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"
class="ydp1da3602fyiv6860857387yahoo-style-wrap">
<div dir="ltr">Greetings Healeyphiles,</div>
<div dir="ltr">Â Â Â Â After a long winter's rest, I
drove my BJ8 for the first time this year and
noticed immediately that I had to depress the
brake pedal far down before braking began, but
if I pumped the pedal a few times the brake
pedal commenced functioning more promptly. This
improvement was fleeting but reproducible. The
brake fluid reservoir is topped off. What might
be the cause and solution of this problem.
Thanks for all help.</div>
<div dir="ltr">rich antal</div>
</div>
<br clear="none">
</div>
</div>
</div>
<div class="ydp1da3602fyqt3068550861"
id="ydp1da3602fyqt81231">_______________________________________________<br
clear="none">
Support Team.Net <a shape="rect"
href="http://www.team.net/donate.html"; rel="nofollow"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.team.net/donate.html</a><br
clear="none">
Suggested annual donation $12.75<br clear="none">
<br clear="none">
Archive: <a shape="rect"
href="http://www.team.net/pipermail/healeys";
rel="nofollow" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.team.net/pipermail/healeys</a>
<a shape="rect"
href="http://autox.team.net/archive/healeys";
rel="nofollow" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://autox.team.net/archive/healeys</a><br
clear="none">
<br clear="none">
<a shape="rect" href="mailto:Healeys@autox.team.net";
rel="nofollow" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">Healeys@autox.team.net</a><br
clear="none">
<a shape="rect"
href="http://autox.team.net/mailman/listinfo/healeys";
rel="nofollow" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://autox.team.net/mailman/listinfo/healeys</a><br
clear="none">
<br clear="none">
Unsubscribe/Manage: <a shape="rect"
href="http://autox.team.net/mailman/options/healeys/warthodson@aol.com";
rel="nofollow" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://autox.team.net/mailman/options/healeys/warthodson@aol.com</a><br
clear="none">
<br clear="none">
</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
</body>
</html>
--------------L0vH6yTJPe7HCSClvrslcikm--
--===============9169242896098756990==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/pipermail/healeys
http://autox.team.net/archive/healeys
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============9169242896098756990==--
|