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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 i=
n the 'pushed in' position. I was thinking it was probably that tipping val=
ve. 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 som=
e more.
________________________________
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
Sounds like a problem with the tipping valve that provides a path to the re=
servoir. When the pedal is depressed the piston in the MC will move allowi=
ng 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 i=
t is supposed to, return to its retracted position and will operate the tip=
ping valve to release pressure to the reservoir. If that valve does not op=
en pressure can build up due to heat causing the brake fluid to expand.
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 i=
n but they shouldn't have to for proper operation.
Dave
Hey guys
I have one of the new TRW MCs, and twice now it's locked up the brakes. Fir=
st 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.
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.
Sloane
69-Six
72-Spit
_______________________________________________
Archive: http://www.team.net/archive
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<div style=3D"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 i=
n the 'pushed in' position. I was thinking it was probably that tipping val=
ve. I am thinking about bleeding
it and just driving it more. I really hate to throw away something brand n=
ew, even though Rimmer has already shipped a free replacement. Maybe all th=
e movement of bleeding will break-it-in some more. </div>
<div>
<div id=3D"appendonsend"></div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" co=
lor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> DAVID MASSEY <dave=
1massey@cs.com><br>
<b>Sent:</b> Thursday, November 4, 2021 3:14 PM<br>
<b>To:</b> im_sloane@hotmail.com <im_sloane@hotmail.com>; 6pack@autox=
.team.net <6pack@autox.team.net><br>
<b>Subject:</b> Re: [6pack] New Master Cylinder locking up</font>
<div> </div>
</div>
<div>
<div style=3D"color:black; font:12pt Arial,Helvetica,sans-serif">
<div><font size=3D"3">Sounds like a problem with the tipping valve that pro=
vides 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 press=
ure 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 press=
ure can build up due to heat causing
the brake fluid to expand. <br>
</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">If the piston, or rather the seals, are sticking in t=
he bore the piston may not be retracting sufficiently to open the tipping v=
alve. They may wear in but they shouldn't have to for proper operatio=
n.
</font><br>
</div>
<div><br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div style=3D"font-family:arial,helvetica; font-size:10pt; color:black"><fo=
nt size=3D"2"><br>
<div id=3D"x_yiv5844916033">
<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
Hey guys</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
I have one of the new TRW MCs, and twice now it's locked up the brakes. Fir=
st 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=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
<br>
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or: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 kn=
own issue/fix. </div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
<br>
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
Sloane </div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
69-Six</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
72-Spit</div>
</div>
</div>
_______________________________________________<br>
nk">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive"; target=3D"_blank">http://w=
ww.team.net/archive</a><br>
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http://autox.team.net/mailman/listinfo/6pack</a><br>
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dave1massey@cs.com" target=3D"_blank">
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