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It could be that the piston was not returning fully the first time but in =
the process of unbolting the master cylinder the piston got dislodged and r=
esolved the issue.=C2=A0 Not so lucky the second time.=C2=A0=20
But this is just speculation.=C2=A0 I wasn't there and even if I was I don'=
t have X-ray vision.
Good luck
=20
Dave=20
=20
=20
-----Original Message-----
From: im sloane <im_sloane@hotmail.com>
To: 6pack@autox.team.net <6pack@autox.team.net>
Sent: Thu, Nov 4, 2021 11:55 am
Subject: Re: [6pack] New Master Cylinder locking up
#yiv7954727051 P {margin-top:0;margin-bottom:0;}Oh, one other thing. I (of =
course) backed off the nuts to the booster first and pulled it completely a=
way from the booster. The piston was NOT stuck in the 'pushed in' position.=
I was thinking it was probably that tipping valve. I am thinking about ble=
eding it and just driving it more. I really hate to throw away something br=
and new, even though Rimmer has already shipped a free replacement. Maybe a=
ll the movement of bleeding will break-it-in some more.=C2=A0
From: DAVID MASSEY <dave1massey@cs.com>
Sent: Thursday, November 4, 2021 3:14 PM
To: im_sloane@hotmail.com <im_sloane@hotmail.com>; 6pack@autox.team.net <6p=
ack@autox.team.net>
Subject: Re: [6pack] New Master Cylinder locking up=C2=A0Sounds like a prob=
lem with the tipping valve that provides a path to the reservoir.=C2=A0 Whe=
n the pedal is depressed the piston in the MC will move allowing the tippin=
g valve to close off allowing pressure to build up and operate the brakes.=
=C2=A0 When the pedal is released the piston returns (or, at least it is su=
pposed to, return to its retracted position and will operate the tipping va=
lve to release pressure to the reservoir.=C2=A0 If that valve does not open=
pressure can build up due to heat causing the brake fluid to expand.=C2=A0=
=20
If the piston, or rather the seals, are sticking in the bore the piston may=
not be retracting sufficiently to open the tipping valve.=C2=A0 They may w=
ear in but they shouldn't have to for proper operation.=C2=A0
Dave=20
Hey guysI have one of the new TRW MCs, and twice now it's locked up the bra=
kes. First time when I backed off the nuts between it and the booster it fr=
eed up, but the second time I had to back off the line to the front brakes =
and when it bled a bit, they freed up. I had noticed the front brakes were =
smoking when I stopped.=C2=A0
Anybody had issue and have any tips for how to fix this one? Easy enough to=
replace, if necessary, but hate to throw away a brand new one if it's a kn=
own issue/fix.=C2=A0
Sloane=C2=A069-Six72-Spit_______________________________________________
Archive: http://www.team.net/archive
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http://autox.team.net/mailman/listinfo/6pack
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<div style="color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size="3">It could be that the piston was not returning fully the
first time but in the process of unbolting the master cylinder the piston got
dislodged and resolved the issue. Not so lucky the second time. <br>
</font></div>
<div><font size="3"><br>
</font></div>
<div><font size="3">But this is just speculation. I wasn't there and even
if I was I don't have X-ray vision.</font></div>
<div><font size="3"><br>
</font></div>
<div><font size="3">Good luck</font><br>
</div>
<div> <br>
</div>
<div style="clear:both"><font size="4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font
size="2">-----Original Message-----<br>
From: im sloane <im_sloane@hotmail.com><br>
To: 6pack@autox.team.net <6pack@autox.team.net><br>
Sent: Thu, Nov 4, 2021 11:55 am<br>
Subject: Re: [6pack] New Master Cylinder locking up<br>
<br>
<div id="yiv7954727051"><style type="text/css">#yiv7954727051 P
{margin-top:0;margin-bottom:0;}</style>
<div dir="ltr">
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
Oh, one other thing. I (of course) backed off the nuts to the booster first and
pulled it completely away from the booster. The piston was NOT stuck in the
'pushed in' position. I was thinking it was probably that tipping valve. I am
thinking about bleeding
it and just driving it more. I really hate to throw away something brand new,
even though Rimmer has already shipped a free replacement. Maybe all the
movement of bleeding will break-it-in some more. </div>
<div>
<div id="yiv7954727051appendonsend"></div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
<br clear="none">
</div>
<hr tabindex="-1" style="display:inline-block;width:98%;">
<div id="yiv7954727051yqtfd81668" class="yiv7954727051yqt4043822881">
<div dir="ltr" id="yiv7954727051divRplyFwdMsg"><font style="font-size:11pt;"
face="Calibri, sans-serif" color="#000000"><b>From:</b> DAVID MASSEY
<dave1massey@cs.com><br clear="none">
<b>Sent:</b> Thursday, November 4, 2021 3:14 PM<br clear="none">
<b>To:</b> im_sloane@hotmail.com <im_sloane@hotmail.com>;
6pack@autox.team.net <6pack@autox.team.net><br clear="none">
<b>Subject:</b> Re: [6pack] New Master Cylinder locking up</font>
<div> </div>
</div>
<div>
<div style="color:black;font:12pt Arial, Helvetica, sans-serif;">
<div><font size="3">Sounds like a problem with the tipping valve that provides
a path to the reservoir. When the pedal is depressed the piston in the MC
will move allowing the tipping valve to close off allowing pressure to build up
and operate the brakes.
When the pedal is released the piston returns (or, at least it is supposed to,
return to its retracted position and will operate the tipping valve to release
pressure to the reservoir. If that valve does not open pressure can build
up due to heat causing
the brake fluid to expand. <br clear="none">
</font></div>
<div><font size="3"><br clear="none">
</font></div>
<div><font size="3">If the piston, or rather the seals, are sticking in the
bore the piston may not be retracting sufficiently to open the tipping
valve. They may wear in but they shouldn't have to for proper
operation.
</font><br clear="none">
</div>
<div><br clear="none">
</div>
<div style="clear:both;"><font size="4">Dave </font><br clear="none">
<br clear="none">
</div>
<div><br clear="none">
</div>
<div><br clear="none">
</div>
<div style="font-family:arial, helvetica;font-size:10pt;color:black;"><font
size="2"><br clear="none">
</font>
<div id="yiv7954727051x_yiv5844916033">
<div dir="ltr">
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
Hey guys</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
I have one of the new TRW MCs, and twice now it's locked up the brakes. First
time when I backed off the nuts between it and the booster it freed up, but the
second time I had to back off the line to the front brakes and when it bled a
bit, they freed up. I
had noticed the front brakes were smoking when I stopped. </div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
<br clear="none">
</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
Anybody had issue and have any tips for how to fix this one? Easy enough to
replace, if necessary, but hate to throw away a brand new one if it's a known
issue/fix. </div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
<br clear="none">
</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
Sloane </div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
69-Six</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0,0,0);">
72-Spit</div>
</div>
</div>
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