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I agree this sounds like a M/C problem, and it's probably moot at this
point, but there's a quick test to (start to) rule out the servo:
'Stand' on the brake pedal--pump it up if necessary--when starting the
car. If the pedal goes down an inch or so when the engine fires and
vacuum builds the servo* is likely functioning properly. You can also
clamp off the vacuum line to the servo and see if braking is affected.
My BJ8's servo makes a popping noise you can feel in the floorboard the
first time I apply the brakes (like when backing out of the garage).
I've never figured out exactly why, but it's reassuring.
Presumably, '0.7 hours' doesn't count 'making a cup,' or having a pint.
* Servos are commonly called 'boosters' outside the LBC community, if
not functioning there's no boost, so braking will require much more
effort. A common failure is the gland seal, which keeps fluid from
entering the vacuum circuit, manifested by white smoke out the tailpipes.
bs
On 6/19/2025 5:40 AM, Alan Wasserman wrote:
> Tom. Â First, my diagnosis stems from what I was experiencing. Â When
> first applying brakes, pedal went down more than half way. Two simple
> pumps and pedal working near top. Â No leaks. Visual showed master
> cylinder looking the 66 years old it was. Â The gamble was that the
> problem might be the servo but if so, breaks wonâ??t properly operate
> after a few pumps. Secondly I was smart enough to know my mechanical
> limits and called two friends I have unqualified respect for, Hank
> Leach and George Baxter. They too felt certain it was the master
> cylinder.
> Now, your issue is quite different. Â First go into the foot pit with
> your flashlight and focus on cylinder connection to break pedal. Move
> pedal in and out to see if operates smoothly and without catch. Â (This
> may be the problem??) Check fluid. If all else fails, hopefully our
> resident experts have sage advice. Good luck and please let us know
> what was the cause.
> Alan Wasserman
> Alanwassermannc@gmail.com
> 732-887-0742
> www.wassermanstudio.com
>
>> On Jun 18, 2025, at 11:02â?¯PM, Michael Salter
>> <michael.salter@gmail.com> wrote:
>>
>> 
>> The time was 0.7 hours Alan (42 minutes)Â as I recall. Unfortunately
>> I have misplaced my " Austin Healey 3000 Mk III Warrenty Repair Times
>> Book" so can't confirm that my memory of that is actually correct
>> however, BMC were renowned for their "stingy" warrenty times. The
>> time allowed for re & re of the engine was only 5.4 hours!!
>>
>> M
>>
>> Get Outlook for Android <https://aka.ms/AAb9ysg>
>> ------------------------------------------------------------------------
>> *From:* Alan Wasserman <alanwassermannc@gmail.com>
>> *Sent:* Wednesday, June 18, 2025 7:10:15 PM
>> *To:* Michael Salter <michael.salter@gmail.com>
>> *Cc:* Alan Wasserman <AlanWassermanNC@gmail.com>; Healeys
>> <healeys@autox.team.net>
>> *Subject:* Re: [Healeys] Healeys Master brake cylinder replace
>> My guess Michael, is that â??.07â?? is NOT for a BJ8. Â Perhaps for the
>> 100â??s that you usually work on. Â Impossible to do in .07 as just to
>> bleed the cylinder and brakes it will take a good 30 minutes +-.
>> Â Unless there is some very special tool to handle this jobâ?¦.
>> Hope all is well with you and family.
>>
>>
>>> On Jun 18, 2025, at 6:20â?¯PM, Michael Salter
>>> <michael.salter@gmail.com> wrote:
>>>
>>> Seem to remember that the  time was 0.7 hrs which of course
>>> included bleeding and a road test.
>>>
>>> M
>>>
>>> Get Outlook for Android <https://aka.ms/AAb9ysg>
>>> ------------------------------------------------------------------------
>>> *From:* Healeys <healeys-bounces@autox.team.net> on behalf of Alan
>>> Wasserman <alanwassermannc@gmail.com>
>>> *Sent:* Wednesday, June 18, 2025 3:27:29 PM
>>> *To:* Healeys <healeys@autox.team.net>
>>> *Cc:* Alan Wasserman <AlanWassermanNC@gmail.com>
>>> *Subject:* Re: [Healeys] Healeys Master brake cylinder replace
>>>
>>>
>>> Â Re Master break cylinder replacement:
>>>
>>> I had reported a few weeks ago that I was about to embark on
>>> replacing my master brake cylinder on my â??66 AH 3000, Â . Â FYI, for
>>> those who have neverâ?¦the simple explanation: Â involved in only four
>>> /*simple */bolts/nuts (and then to bleed the cylinder and brakes).
>>> Â The â??/simple/â?? four nuts/bolts took approximately 3 hoursâ?¦YES<
>>> THREE HOURS!!. Â It is impossible to get to the cylinder without
>>> removing the back air filter (which by itself is not a simple task
>>> without the right tools). Â Once your filter is off, it still
>>> requires both a bent small wrench and also an articulating socket,
>>> small arms and hands. Â Also, a tipâ?¦before inserting your cylinder
>>> into the firewall hole, slide down the protective rubber, squeezing
>>> in the cylinder and than, while in the foot pit, slip the rubber end
>>> into the hole before fastening the cylinder to the side of the brake
>>> pedal. Â When fastening the cylinder to the firewall, do not confuse
>>> the bolt for the airfilter. After bleeding the brakes, take a spin
>>> and bleed one more time. Â I think it easier to replace a steering
>>> wheel and dealing with the traficator. Â Anyway, I hope this helps
>>> someone.
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<body>
I agree this sounds like a M/C problem, and it's probably moot at
this point, but there's a quick test to (start to) rule out the
servo: 'Stand' on the brake pedal--pump it up if necessary--when
starting the car. If the pedal goes down an inch or so when the
engine fires and vacuum builds the servo* is likely functioning
properly. You can also clamp off the vacuum line to the servo and
see if braking is affected. My BJ8's servo makes a popping noise you
can feel in the floorboard the first time I apply the brakes (like
when backing out of the garage). I've never figured out exactly why,
but it's reassuring.<br>
<br>
Presumably, '0.7 hours' doesn't count 'making a cup,' or having a
pint. <br>
<br>
* Servos are commonly called 'boosters' outside the LBC community,
if not functioning there's no boost, so braking will require much
more effort. A common failure is the gland seal, which keeps fluid
from entering the vacuum circuit, manifested by white smoke out the
tailpipes. <br>
<br>
bs<br>
<br>
<div class="moz-cite-prefix">On 6/19/2025 5:40 AM, Alan Wasserman
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:7264E967-6C79-41D0-9ACB-9AFE189CAF54@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Tom. Â First, my diagnosis stems from what I was experiencing.
 When first applying brakes, pedal went down more than half way.
Two simple pumps and pedal working near top. Â No leaks. Visual
showed master cylinder looking the 66 years old it was. Â The
gamble was that the problem might be the servo but if so, breaks
wonâ??t properly operate after a few pumps. Secondly I was smart
enough to know my mechanical limits and called two friends I have
unqualified respect for, Hank Leach and George Baxter. They too
felt certain it was the master cylinder.Â
<div>Now, your issue is quite different. Â First go into the foot
pit with your flashlight and focus on cylinder connection to
break pedal. Move pedal in and out to see if operates smoothly
and without catch. Â (This may be the problem??) Check fluid. If
all else fails, hopefully our resident experts have sage advice.
Good luck and please let us know what was the cause. <br
id="lineBreakAtBeginningOfSignature">
<div dir="ltr">Alan Wasserman
<div><a class="moz-txt-link-abbreviated"
href="mailto:Alanwassermannc@gmail.com";>Alanwassermannc@gmail.com</a></div>
<div>732-887-0742</div>
<div><a class="moz-txt-link-abbreviated"
href="http://www.wassermanstudio.com";>www.wassermanstudio.com</a></div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Jun 18, 2025, at 11:02â?¯PM, Michael
Salter <a class="moz-txt-link-rfc2396E"
href="mailto:michael.salter@gmail.com";><michael.salter@gmail.com></a>
wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
<div dir="auto"
style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial,
Helvetica, sans-serif; font-size: 12pt;">
The time was 0.7 hours Alan (42 minutes)Â as I recall.
Unfortunately I have misplaced my " Austin Healey 3000 Mk
III Warrenty Repair Times Book" so can't confirm that my
memory of that is actually correct however, BMC were
renowned for their "stingy" warrenty times. The time
allowed for re & re of the engine was only 5.4 hours!!</div>
<div dir="auto"
style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial,
Helvetica, sans-serif; font-size: 12pt;">
<br>
</div>
<div dir="auto"
style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial,
Helvetica, sans-serif; font-size: 12pt;">
M</div>
<div id="ms-outlook-mobile-body-separator-line" dir="auto"><br>
</div>
<div id="ms-outlook-mobile-signature"
style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial,
Helvetica, sans-serif; font-size: 12pt;"
dir="auto">
Get <a href="https://aka.ms/AAb9ysg";
moz-do-not-send="true">Outlook for Android</a></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font
face="Calibri, sans-serif" style="font-size:11pt"
color="#000000"><b>From:</b> Alan Wasserman
<a class="moz-txt-link-rfc2396E"
href="mailto:alanwassermannc@gmail.com";><alanwassermannc@gmail.com></a><br>
<b>Sent:</b> Wednesday, June 18, 2025 7:10:15 PM<br>
<b>To:</b> Michael Salter
<a class="moz-txt-link-rfc2396E"
href="mailto:michael.salter@gmail.com";><michael.salter@gmail.com></a><br>
<b>Cc:</b> Alan Wasserman
<a class="moz-txt-link-rfc2396E"
href="mailto:AlanWassermanNC@gmail.com";><AlanWassermanNC@gmail.com></a>;
Healeys
<a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a><br>
<b>Subject:</b> Re: [Healeys] Healeys Master brake
cylinder replace</font>
<div>Â </div>
</div>
<div style="line-break:after-white-space">My guess Michael,
is that â??.07â?? is NOT for a BJ8. Â Perhaps for the 100â??s
that you usually work on. Â Impossible to do in .07 as just
to bleed the cylinder and brakes it will take a good 30
minutes +-. Â Unless there is some very special tool to
handle this jobâ?¦.
<div>Hope all is well with you and family.</div>
<div><br>
<div>
<div><br>
<blockquote type="cite">
<div>On Jun 18, 2025, at 6:20â?¯PM, Michael Salter
<a class="moz-txt-link-rfc2396E"
href="mailto:michael.salter@gmail.com";><michael.salter@gmail.com></a>
wrote:</div>
<br class="x_Apple-interchange-newline">
<div>
<div>
<div dir="auto"
style="font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif;
font-size:12pt">
Seem to remember that the  time was 0.7 hrs
which of course included bleeding and a road
test. </div>
<div dir="auto"
style="font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif;
font-size:12pt">
<br>
</div>
<div dir="auto"
style="font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif;
font-size:12pt">
M</div>
<div
id="x_ms-outlook-mobile-body-separator-line"
dir="auto"><br>
</div>
<div id="x_ms-outlook-mobile-signature"
dir="auto"
style="font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif;
font-size:12pt">
Get <a href="https://aka.ms/AAb9ysg";
moz-do-not-send="true">Outlook for
Android</a></div>
<hr tabindex="-1"
style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font
face="Calibri, sans-serif"
style="font-size:11pt"><b>From:</b>
Healeys
<a class="moz-txt-link-rfc2396E"
href="mailto:healeys-bounces@autox.team.net";><healeys-bounces@autox.team.net></a>
on
behalf of Alan Wasserman
<a class="moz-txt-link-rfc2396E"
href="mailto:alanwassermannc@gmail.com";><alanwassermannc@gmail.com></a><br>
<b>Sent:</b> Wednesday, June 18, 2025
3:27:29 PM<br>
<b>To:</b> Healeys
<a class="moz-txt-link-rfc2396E"
href="mailto:healeys@autox.team.net";><healeys@autox.team.net></a><br>
<b>Cc:</b> Alan Wasserman
<a class="moz-txt-link-rfc2396E"
href="mailto:AlanWassermanNC@gmail.com";><AlanWassermanNC@gmail.com></a><br>
<b>Subject:</b> Re: [Healeys] Healeys
Master brake cylinder replace</font>
<div>Â </div>
</div>
<div style="line-break:after-white-space">
<div><br>
</div>
<div><br>
</div>
 Re Master break cylinder replacement:
<div><br>
</div>
<div>I had reported a few weeks ago that I
was about to embark on replacing my master
brake cylinder on my â??66 AH 3000, Â . Â FYI,
for those who have neverâ?¦the simple
explanation: Â involved in only four
<i><b>simple </b></i>bolts/nuts (and then
to bleed the cylinder and brakes). Â The
â??<i>simple</i>â??
four nuts/bolts took approximately 3
hoursâ?¦YES< THREE HOURS!!. Â It is
impossible to get to the cylinder without
removing the back air filter (which by
itself is not a simple task without the
right tools). Â Once your filter is off, it
still requires both a bent small wrench
and also an articulating socket, small
arms and hands. Â Also, a tipâ?¦before
inserting your cylinder into the firewall
hole, slide down the protective rubber,
squeezing in the cylinder and than, while
in the foot pit, slip the rubber end into
the hole before fastening the cylinder to
the side of the brake pedal. Â When
fastening the cylinder to the firewall, do
not confuse the bolt for the airfilter.
After bleeding the brakes, take a spin and
bleed one more time. Â I think it easier to
replace a steering wheel and dealing with
the traficator. Â Anyway, I hope this helps
someone.</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
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