Re: [6pack] New Master Cylinder locking up

[DAVID MASSEY <dave1massey@cs.com>]

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 Sounds like a problem with the tipping valve that provides a path to the r=
eservoir.=C2=A0 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 o=
perate the brakes.=C2=A0 When the pedal is released the piston returns (or,=
 at least it is supposed to, return to its retracted position and will oper=
ate the tipping valve to release pressure to the reservoir.=C2=A0 If that v=
alve does not open pressure can build up due to heat causing the brake flui=
d 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=20
=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 9:56 am
Subject: [6pack] New Master Cylinder locking up

 #yiv5844916033 P {margin-top:0;margin-bottom:0;}Hey guysI have one of the =
new TRW MCs, and twice now it's locked up the brakes. First time when I bac=
ked off the nuts between it and the booster it freed up, but the second tim=
e I had to back off the line to the front brakes and when it bled a bit, th=
ey 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_______________________________________________
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<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.&nbsp; 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.&nbsp; 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.&nbsp; If that 
valve does not open pressure can build up due to heat causing the brake fluid 
to expand.&nbsp; <br>
</font></div>

<div><font size="3"><br>
</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.&nbsp; They may wear in but they shouldn't have to for proper 
operation.&nbsp; </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 &lt;im_sloane@hotmail.com&gt;<br>
To: 6pack@autox.team.net &lt;6pack@autox.team.net&gt;<br>
Sent: Thu, Nov 4, 2021 9:56 am<br>
Subject: [6pack] New Master Cylinder locking up<br>
<br>

<div id="yiv5844916033">

 
<style type="text/css">#yiv5844916033 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);">
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.&nbsp;</div>


<div style="font-family:Calibri, Helvetica, 
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
<br>

</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.&nbsp;</div>


<div style="font-family:Calibri, Helvetica, 
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
<br>

</div>


<div style="font-family:Calibri, Helvetica, 
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
Sloane&nbsp;</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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