--===============2532677937861591872==
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I have heard of =E2=80=9Cdisappearing brake fluid=E2=80=9D cases where =
it has been sucked into the booster due to a leak in the master cylinder =
seal. Normally one would expect it to drip into the footwell, but engine =
vacuum sucks it in and burns it. In any case, mere bleeding is not going =
to solve this issue. It definitely went somewhere.
--
Max Heim
'66 MGB
> On May 6, 2020, at 12:23 AM, PaulHunt73 via Mgs <mgs@autox.team.net> =
wrote:
>=20
> 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.
> =20
> 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.
> =20
> 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.
> =20
> 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.
> =20
> Bleeding method varies according to system type i.e. single or dual.
> =20
> 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
> _______________________________________________
>=20
> Donate: http://www.team.net/donate.html =
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> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs =
<http://www.team.net/pipermail/mgs> http://autox.team.net/archive =
<http://autox.team.net/archive>
>=20
> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/mvheim@sonic.net =
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">I have heard of =E2=80=9Cdisappearing brake fluid=E2=80=9D =
cases where it has been sucked into the booster due to a leak in the =
master cylinder seal. Normally one would expect it to drip into the =
footwell, but engine vacuum sucks it in and burns it. In any case, mere =
bleeding is not going to solve this issue. It definitely went =
somewhere.<div class=3D""><br class=3D""><div class=3D"">
<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"color: rgb(0, 0, 0); =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"margin: 0px; font-size: 13px;" =
class=3D"">--</div><div style=3D"margin: 0px; font-size: 13px; =
min-height: 16px;" class=3D"">Max Heim</div><div style=3D"margin: 0px; =
font-size: 13px;" class=3D"">'66 MGB</div></div></div>
</div>
<br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On May 6, 2020, at 12:23 AM, PaulHunt73 via Mgs <<a =
href=3D"mailto:mgs@autox.team.net"; class=3D"">mgs@autox.team.net</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
class=3D"">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.</font></div><div style=3D"font-family: Verdana; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" =
class=3D""><font size=3D"2" class=3D""></font> </div><div =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
class=3D"">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.</font></div><div style=3D"font-family: Verdana; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" =
class=3D""><font size=3D"2" class=3D""></font> </div><div =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
class=3D"">Is this single-circuit or dual-circuit brakes? The =
former should have a 'slow-return' valve in the master =
outlet</font> <font size=3D"2" class=3D"">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.</font></div><div =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
class=3D""></font> </div><div style=3D"font-family: Verdana; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: =
rgb(255, 255, 255);" class=3D""><font size=3D"2" class=3D"">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.</font></div><div =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
class=3D""></font> </div><div style=3D"font-family: Verdana; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: =
rgb(255, 255, 255);" class=3D""><font size=3D"2" class=3D"">Bleeding =
method varies according to system type i.e. single or =
dual.</font></div><div style=3D"font-family: Verdana; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" =
class=3D""><font size=3D"2" class=3D""></font> </div><div =
style=3D"font-family: Verdana; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
class=3D"">PaulH.</font></div><blockquote style=3D"font-family: Verdana; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: =
rgb(255, 255, 255); border-left-width: 2px; border-left-style: solid; =
border-left-color: rgb(0, 0, 0); padding-left: 5px; padding-right: 0px; =
margin-left: 5px; margin-right: 0px;" class=3D"" type=3D"cite"><div =
style=3D"font-style: normal; font-variant-caps: normal; font-weight: =
normal; font-size: 10pt; line-height: normal; font-family: arial;" =
class=3D"">----- Original Message -----</div><font size=3D"-1" =
class=3D""><font face=3D"Arial" class=3D""><br class=3D"">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<br =
class=3D""></font></font></blockquote><span style=3D"font-family: =
Verdana; font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: =
rgb(255, 255, 255); float: none; display: inline !important;" =
class=3D"">_______________________________________________</span><br =
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