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--000000000000d42bfa058ec58e63
Sounds to me as though the master cylinder piston circlip has become
dislodged.
M
On Sun, Jul 28, 2019 at 3:47 PM Michael Oritt <michael.oritt@gmail.com>
wrote:
> In yesterday's fiasco after a few miles of driving the brakes went to full
> lock with no play whatsoever in the pedal, an d I had to pull off the
> road and wait about 30 minutes until the pressure let off enough so that I
> could make it back to the shop. The consensus opinion, both on this forum
> and on the Healey autox email list, is that there was not enough free play
> in the master cylinder pushrod, thus preventing the MC piston to go past
> the return hole and relieve pressure.
>
> Earlier this afternoon, with everything cool, I put the car up on jack
> stands and while under the car I actuated the brake while spinning the left
> front wheel. Whatever free play I had--or thought I had--last put into the
> pedal linkage had disappeared and with no free play the slightest bit of
> pedal movement brought about brake activation. So after loosening the lock
> nut I rotat the shaft about 1/4"-3/8" until there seemed to be the
> appropriate amount of free movement and, again using moving the pedal from
> under the car and spiing the left front wheel, there seemed to be some
> gradual brake actuation. So I locked the shaft down and went out for the
> proverbial test ride. At first all seemed good but as the engine warmed
> up and after using the brakes several times with different degrees of
> pressure, etc. I could again feel the brakes begin to drag and by the time
> I got back to the garage the pedal height had changed with all free play
> having disappeared.
>
> I can't help but feel this phenom is--at least partially--related to heat
> transfer into the MC. It is very warm here in MD and, with the same pedal
> shaft adjustment as yesterday, prior to temperatures going up there did not
> seem to be any issue. Then again maybe there has been some deterioration
> within the MC and/or debris within the cylinder itself.
>
> Anyway, I will make another attempt at adjustment tomorrow morning and
> report back. In the meantime thanks for the many helpful suggestions.
> However it appears that more work needs to be done.
>
> Best--Michael Oritt
>
> On Sun, Jul 28, 2019 at 2:25 PM <warthodson@aol.com> wrote:
>
>> Michael,
>> You are correct in pointing out that there is known problem with the 100
>> master cylinders. In addition, inadequate free play adjustment of the 100
>> master cylinder could also cause similar symptoms. Adjusting the free play
>> seems like the easiest thing to check first.
>> Gary Hodson
>>
>>
>> -----Original Message-----
>> From: Michael Salter <michaelsalter@gmail.com>
>> To: warthodson <warthodson@aol.com>
>> Cc: Michael Oritt <michael.oritt@gmail.com>; Oudesluys <
>> coudesluijs@chello.nl>; healeys <healeys@autox.team.net>
>> Sent: Sun, Jul 28, 2019 9:11 am
>> Subject: Re: [Healeys] Brake issue
>>
>> Regarding pushrod free play.
>> Unfortunately the known problem with 100 master cylinders is internal to
>> the cylinder itself and is not resolved by ensuring that the push rod has
>> free play.
>> Roger Moment wrote an excellent, and of course exhaustive, article on
>> the subject many years back after he encountered difficulties when using
>> silicon fluid.
>>
>> M
>>
>> On Sun, Jul 28, 2019, 9:42 AM warthodson--- via Healeys, <
>> healeys@autox.team.net> wrote:
>>
>> I still suspect the lack of proper free play in the brake pedal & this is
>> the easiest to check. Simply adjust the free play, temporarily, such that
>> there is excessive free play & go for a test drive.
>> Gary H
>>
>>
>>
>>
--000000000000d42bfa058ec58e63
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Sounds to me as though the master cylinde=
r piston circlip has become dislodged.</div><div class=3D"gmail_default" st=
yle=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;font=
-size:small">M<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Sun, Jul 28, 2019 at 3:47 PM Michael Oritt <<=
a href=3D"mailto:michael.oritt@gmail.com";>michael.oritt@gmail.com</a>> w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr"><div class=3D"gmail_default" style=3D"color:rgb(51,51,255)"><span =
style=3D"color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Genev=
a,sans-serif;font-size:13px">In yesterday's fiasco after a few miles of=
driving the brakes went to full lock with no play whatsoever in the pedal,=
</span><span style=3D"color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,=
Calibri,Geneva,sans-serif;font-size:13px">=C2=A0an d I had to pull off the =
road and wait about 30 minutes until the pressure let off enough so that I =
could make it back to the shop.=C2=A0 The consensus opinion, both on this f=
orum and on the Healey autox email list, is that there was not enough free =
play in the master cylinder pushrod, thus preventing the MC piston to go pa=
st the return hole and relieve pressure.</span><br style=3D"color:rgb(34,34=
,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:1=
3px"><br style=3D"color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Cali=
bri,Geneva,sans-serif;font-size:13px"><span style=3D"color:rgb(34,34,34);fo=
nt-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px">Ea=
rlier this afternoon, with everything cool, I put the car up on jack stands=
and while under the car I actuated the brake while spinning the left front=
wheel.=C2=A0 Whatever free play I had--or thought I had--last put into the=
pedal linkage had disappeared and with no free play the slightest bit of p=
edal movement brought about brake activation.=C2=A0 So after loosening the =
lock nut I rotat the shaft about 1/4"-3/8" until there seemed to =
be the appropriate amount of free movement and, again using moving the peda=
l from under the car and spiing the left front wheel, there seemed to be so=
me gradual brake actuation.=C2=A0=C2=A0</span><span style=3D"color:rgb(34,3=
4,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:=
13px">So I locked the shaft down and went out for the proverbial test ride.=
=C2=A0=C2=A0</span><span style=3D"color:rgb(34,34,34);font-family:Verdana,A=
rial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px">At first all seemed g=
ood but as the engine warmed up and after using the brakes several times wi=
th different degrees of pressure, etc. I could again feel the brakes begin =
to drag and by the time I got back to the garage the pedal height had chang=
ed with all free play having disappeared.=C2=A0 =C2=A0</span><br style=3D"c=
olor:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-ser=
if;font-size:13px"><br style=3D"color:rgb(34,34,34);font-family:Verdana,Ari=
al,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><span style=3D"color:rg=
b(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font=
-size:13px">I can't help but feel this phenom is--at least partially--r=
elated to heat transfer into the MC.=C2=A0 It is very warm here in MD and, =
with the same pedal shaft adjustment as yesterday, prior to temperatures go=
ing up there did not seem to be any issue.=C2=A0 Then again maybe there has=
been some deterioration within the MC and/or debris within the cylinder it=
self.</span><br style=3D"color:rgb(34,34,34);font-family:Verdana,Arial,Taho=
ma,Calibri,Geneva,sans-serif;font-size:13px"><br style=3D"color:rgb(34,34,3=
4);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13p=
x"><span style=3D"color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Cali=
bri,Geneva,sans-serif;font-size:13px">Anyway, I will make another attempt a=
t adjustment tomorrow morning and report back.=C2=A0 In the meantime thanks=
for the many helpful suggestions. However it appears that more work needs =
to be done.=C2=A0=C2=A0</span></div><div class=3D"gmail_default" style=3D"c=
olor:rgb(51,51,255)"><span style=3D"color:rgb(34,34,34);font-family:Verdana=
,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><br></span></div><d=
iv class=3D"gmail_default" style=3D"color:rgb(51,51,255)"><span style=3D"co=
lor:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-seri=
f;font-size:13px">Best--Michael Oritt=C2=A0=C2=A0</span><br></div></div><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, J=
ul 28, 2019 at 2:25 PM <<a href=3D"mailto:warthodson@aol.com"; target=3D"=
_blank">warthodson@aol.com</a>> wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex">
<div style=3D"color:black;font:10pt arial">
<div>Michael,</div>
<div>You are correct in pointing out that there is known problem with the 1=
00 master cylinders. In addition, inadequate free play adjustment of the 10=
0 master cylinder could also cause similar symptoms. Adjusting the free pla=
y seems like the easiest thing to check first.</div>
<div>Gary Hodson</div>
<br>
<br>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Michael Salter <<a href=3D"mailto:michaelsalter@gmail.com"; target=
=3D"_blank">michaelsalter@gmail.com</a>><br>
To: warthodson <<a href=3D"mailto:warthodson@aol.com"; target=3D"_blank">=
warthodson@aol.com</a>><br>
Cc: Michael Oritt <<a href=3D"mailto:michael.oritt@gmail.com"; target=3D"=
_blank">michael.oritt@gmail.com</a>>; Oudesluys <<a href=3D"mailto:co=
udesluijs@chello.nl" target=3D"_blank">coudesluijs@chello.nl</a>>; heale=
ys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@=
autox.team.net</a>><br>
Sent: Sun, Jul 28, 2019 9:11 am<br>
Subject: Re: [Healeys] Brake issue<br>
<br>
<div id=3D"gmail-m_1074233506003409621gmail-m_5983024441313767282yiv0394265=
488">
<div>
<div>Regarding pushrod free play.
<div>Unfortunately the known problem with 100 master cylinders is internal =
to the cylinder itself and is not resolved by ensuring that the push rod ha=
s free play.</div>
<div>Roger Moment wrote an excellent, and of course exhaustive,=C2=A0 artic=
le on the subject many years back after he encountered difficulties when us=
ing silicon fluid.=C2=A0</div>
<div><br clear=3D"none"></div>
<div>M</div>
</div>
<br clear=3D"none">
<div class=3D"gmail-m_1074233506003409621gmail-m_5983024441313767282yiv0394=
265488gmail_quote">
<div class=3D"gmail-m_1074233506003409621gmail-m_5983024441313767282yiv0394=
265488yqt7669362516" id=3D"gmail-m_1074233506003409621gmail-m_5983024441313=
767282yiv0394265488yqt71177">
<div class=3D"gmail-m_1074233506003409621gmail-m_5983024441313767282yiv0394=
265488gmail_attr" dir=3D"ltr">On Sun, Jul 28, 2019, 9:42 AM warthodson--- v=
ia Healeys, <<a href=3D"mailto:healeys@autox.team.net"; rel=3D"noopener n=
oreferrer" shape=3D"rect" target=3D"_blank">healeys@autox.team.net</a>> =
wrote:<br clear=3D"none"></div>
<blockquote class=3D"gmail-m_1074233506003409621gmail-m_5983024441313767282=
yiv0394265488gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px=
solid rgb(204,204,204);padding-left:1ex">
<div style=3D"color:black;font:10pt arial">
<div>I still suspect the lack of proper free play in the brake pedal & =
this is the easiest to check. Simply adjust the free play, temporarily, suc=
h that there is excessive free play & go for a test drive.=C2=A0</div>
<div>Gary H</div>
<br clear=3D"none">
<br clear=3D"none">
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><br c=
lear=3D"none"></div>
</div>
</blockquote></div>
</div>
</div>
</div>
</div>
</div>
</blockquote></div>
</blockquote></div>
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