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At my wits end with this problem ...
The brakes on my BJ8 have always been hard and bit well with little =
pedal movement.
Changed out the front callipers (to 4 pot) and the problems started.
After repeated bleeding on first push, pedal went to the floor.
After 2/3 pumps the pedal came right up and held. After about 30 secs =
of no pressure on pedal goes to the floor again.
Pistons are all in contact with pads and pads with disc; all looks good =
at callipers.
Suspecting a faulty MC changed it out.
Primed the new MC with fluid prior to installing.
Same story after another 1.5 pints of DOT 4 fluid focusing mainly on =
bleeding front callipers and booster (new); also bled rear drums.
Pedal still goes to the floor on first pump and comes up after pumping =
as before.
No visible leaks and inlet from reservoir shows no leaks: tapped =
callipers with mallet to dislodge any air pockets.
I am using the one man bleed system a with clear tube into a container =
and close the bleeder valve with no visible air at nipple and full tube =
of fluid to container. BTW also changed clutch MC at same time and no =
problems with bleeding etc.
Have now run about 1.5 pints of fluid through the new MC - perhaps am =
being too impatient ? =20
But no evidence of any air after about 0.5 pint. Typically how much =
fluid is required to clear air from MC and lines ?
Now sort or suspecting the inlet to MC from reservoir but for life of me =
cannot see how air can get in with no visible fluid leaks,
Any ideas from the more AH experienced listers appreciated.
rg
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<HTML><HEAD></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Comic Sans MS'; COLOR: =
#000000">
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">At my wits end with this =
problem=20
<SPAN style=3D"mso-spacerun: yes"> </SPAN>...</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">The brakes on my BJ8 have =
always been=20
hard and bit well with little pedal movement.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Changed <SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>out the front callipers (to 4 =
pot) and=20
the problems started.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">After repeated bleeding =
on first=20
push,<SPAN style=3D"mso-spacerun: yes"> </SPAN>pedal went to the=20
floor.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">After 2/3 pumps the pedal =
came right=20
up and held.<SPAN style=3D"mso-spacerun: yes"> </SPAN>After about =
30 secs of=20
no pressure on pedal <SPAN style=3D"mso-spacerun: yes"> </SPAN>goes =
to the=20
floor again.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Pistons are all in =
contact with pads=20
and pads with disc; all looks good at callipers.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Suspecting a faulty MC =
changed it=20
out.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Primed the new MC with =
fluid prior to=20
installing.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Same story after another =
1.5 pints of=20
DOT 4 fluid focusing mainly on bleeding front callipers and booster =
(new); <SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>also bled rear =
drums.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Pedal still goes to the =
floor on=20
first pump and comes up after pumping as before.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">No visible leaks and =
inlet from=20
reservoir shows no leaks: tapped callipers with mallet to dislodge any =
air=20
pockets.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">I am using the one man =
bleed system a=20
with clear tube into a container and close the bleeder valve <SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>with no visible air at nipple =
and full=20
tube of fluid to container. BTW also changed clutch MC at same time and =
no=20
problems with bleeding etc.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Have now run about 1.5 =
pints of fluid=20
through the new MC - <SPAN style=3D"mso-spacerun: =
yes"> </SPAN>perhaps am=20
being <SPAN style=3D"mso-spacerun: yes"> </SPAN>too impatient ? =
</FONT><SPAN=20
style=3D"mso-spacerun: yes"><FONT=20
style=3D"FONT-SIZE: 11pt"> </FONT></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">But no evidence of any =
air after=20
about 0.5 pint. Typically how much fluid is required to clear air from =
MC and=20
lines ?</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Now sort or suspecting =
the inlet to=20
MC from reservoir but for life of me cannot see how air can get in with =
no=20
visible fluid leaks,</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT style=3D"FONT-SIZE: 11pt">Any ideas from the more =
AH=20
experienced listers appreciated.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 6pt; LINE-HEIGHT: =
13pt"><FONT=20
face=3DCalibri><FONT=20
style=3D"FONT-SIZE: 11pt">rg</FONT></FONT></P></DIV></DIV></BODY></HTML>
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