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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>
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<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>
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<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>
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<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">
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<div class="ydp1da3602fyiv6860857387moz-cite-prefix">On
5/20/2025 1:20 PM, Richard Antal via Healeys
wrote:<br clear="none">
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<div dir="ltr">Greetings Healeyphiles,</div>
<div dir="ltr"> 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>
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