<div dir="ltr"><div class="gmail_default" style="color:#3333ff"><span style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,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="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"> 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.</span><br style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><br style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><span style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px">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. </span><span style="color:rgb(34,34,34);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. </span><span style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px">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. </span><br style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><br style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><span style="color:rgb(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--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.</span><br style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><br style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><span style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px">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. </span></div><div class="gmail_default" style="color:#3333ff"><span style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px"><br></span></div><div class="gmail_default" style="color:#3333ff"><span style="color:rgb(34,34,34);font-family:Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif;font-size:13px">Best--Michael Oritt </span><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jul 28, 2019 at 2:25 PM <<a href="mailto:warthodson@aol.com">warthodson@aol.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="color:black;font:10pt arial">
<div>Michael,</div>
<div>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.</div>
<div>Gary Hodson</div>
<br>
<br>
<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Michael Salter <<a href="mailto:michaelsalter@gmail.com" target="_blank">michaelsalter@gmail.com</a>><br>
To: warthodson <<a href="mailto:warthodson@aol.com" target="_blank">warthodson@aol.com</a>><br>
Cc: Michael Oritt <<a href="mailto:michael.oritt@gmail.com" target="_blank">michael.oritt@gmail.com</a>>; Oudesluys <<a href="mailto:coudesluijs@chello.nl" target="_blank">coudesluijs@chello.nl</a>>; healeys <<a href="mailto:healeys@autox.team.net" target="_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="gmail-m_5983024441313767282yiv0394265488">
<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 has free play.</div>
<div>Roger Moment wrote an excellent, and of course exhaustive, article on the subject many years back after he encountered difficulties when using silicon fluid. </div>
<div><br clear="none"></div>
<div>M</div>
</div>
<br clear="none">
<div class="gmail-m_5983024441313767282yiv0394265488gmail_quote">
<div class="gmail-m_5983024441313767282yiv0394265488yqt7669362516" id="gmail-m_5983024441313767282yiv0394265488yqt71177">
<div class="gmail-m_5983024441313767282yiv0394265488gmail_attr" dir="ltr">On Sun, Jul 28, 2019, 9:42 AM warthodson--- via Healeys, <<a href="mailto:healeys@autox.team.net" rel="noopener noreferrer" shape="rect" target="_blank">healeys@autox.team.net</a>> wrote:<br clear="none"></div>
<blockquote class="gmail-m_5983024441313767282yiv0394265488gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="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, such that there is excessive free play & go for a test drive. </div>
<div>Gary H</div>
<br clear="none">
<br clear="none">
<div style="font-family:arial,helvetica;font-size:10pt;color:black"><br clear="none"></div>
</div>
</blockquote></div>
</div>
</div>
</div>
</div>
</div>
</blockquote></div>