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I'm not aware that blowing and sucking on any tube at the carb will help =
in diagnosing the brakes. If you mean the servo hose that should come =
from the inlet manifold but still be no help.
Stomping on the pedal should not put air into the system, if it does =
then there is a fault somewhere that needs to be found.
Is this single-circuit or dual-circuit brakes? The former should have a =
'slow-return' valve in the master outlet and with that if a couple of =
quick pumps on the pedal makes the pedal shorter and harder, but then it =
goes long and spongy again if released for a few seconds, that does =
indicate air in the system. Dual circuit varied.
Unless the fluid level in the master dropped right down to outlet level, =
or you have opened the plumbing anywhere, you should not get air in the =
system by being parked up. A leak will of course lower the level, could =
possibly allow air in I suppose, but doubtful in my mind. I've found =
that fluid dropping on a concrete floor 'evaporates' over time. Check =
the carpets under the pedal as that is another place where fluid goes if =
the master secondary seal fails.
Bleeding method varies according to system type i.e. single or dual.
PaulH.
----- Original Message -----=20
I have a power assist brake system which after bringing out of winter =
cover my MGB GT V8 exhibited brake failure No brake fluid on the floor =
but it did need topping up. So added Dot 4 but still soft squashy =
pedal. Blowing/sucking on tube to Edelbrock carb (I have a Rover V8 =
dropped in) it sucked but would not blow (I understand this is correct}. =
So we figured that the brakes need bleeding - is this a correct =
diagnosis? Any tips for a non-brake but fairly well versed owner. If =
I stomped a lot on the pedal when engine running would that put air into =
the brake pipes
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<DIV><FONT size=3D2>I'm not aware that blowing and sucking on any tube =
at the carb=20
will help in diagnosing the brakes. If you mean the servo hose =
that should=20
come from the inlet manifold but still be no help.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Stomping on the pedal should not put air into the =
system, if=20
it does then there is a fault somewhere that needs to be =
found.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Is this single-circuit or dual-circuit brakes? =
The=20
former should have a 'slow-return' valve in the master =
outlet</FONT> <FONT=20
size=3D2>and with that if a couple of quick pumps on the pedal makes the =
pedal=20
shorter and harder, but then it goes long and spongy again if released =
for a few=20
seconds, that does indicate air in the system. Dual circuit=20
varied.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Unless the fluid level in the master dropped =
right down=20
to outlet level, or you have opened the plumbing anywhere, you should =
not get=20
air in the system by being parked up. A leak will of course lower =
the=20
level, could possibly allow air in I suppose, but doubtful in my =
mind. =20
I've found that fluid dropping on a concrete floor 'evaporates' over =
time. =20
Check the carpets under the pedal as that is another place where fluid =
goes if=20
the master secondary seal fails.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Bleeding method varies according to system type i.e. =
single or=20
dual.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV><FONT=20
size=3D-1><FONT face=3DArial><BR>I have a power assist brake system =
which after=20
bringing out of winter cover my MGB GT V8 exhibited brake =
failure No=20
brake fluid on the floor but it did need topping up. So =
added Dot=20
4 but still soft squashy pedal. =
Blowing/sucking on=20
tube to Edelbrock carb (I have a Rover V8 dropped in) it sucked but =
would not=20
blow (I understand this is correct}. So we figured that the =
brakes need=20
bleeding - is this a correct diagnosis? Any tips for a non-brake =
but=20
fairly well versed owner. If I stomped a lot on the pedal =
when=20
engine running would that put air into the brake=20
pipes<BR></FONT></FONT></BLOCKQUOTE></BODY></HTML>
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