From: steelek_2000_REMOVE_434420_THIS_@yahoo.com
the only thing i can think of is the residual
pressure valve.it keeps some pressure in the rear brakes
so that the springs in the brakes dont push the
fluid out of the wheel cylindars when released.if this
is not funcktioning the rear brakes may take a few
pumps to fill the wheel cylindar enouf to aply the
brakes.
[This is message #29709 by user steelek_2000 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: vegasvega1_REMOVE_225931_THIS_@yahoo.com
Clyde, Thanks for your quick response! You've
made some good points and here are my responses. We
found no leaks throughout the system. My fluid levels
were not low either. I did not bench test the NAPA
new(rebuilt) master cylinder. But, I think air may still be in
the system. As for the rear brakes, there was a
little wetness on the back side of what I think is the
piston that goes into the rear brake cylinder. Also the
mechanic showed me there was a small amount of grit inside
the rear cylinder. I've just pulled out my Clymer
71-77 Vega guide. Maybe I'll show this to the mechanic
tomorrow. Thanks! Brad
[This is message #29735 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Clyde, Thanks for your quick response! You've
made some good points and here are my responses. We
found no leaks throughout the system. My fluid levels
were not low either. I did not bench test the NAPA
new(rebuilt) master cylinder. But, I think air may still be in
the system. As for the rear brakes, there was a
little wetness on the back side of what I think is the
piston that goes into the rear brake cylinder. Also the
mechanic showed me there was a small amount of grit inside
the rear cylinder. I've just pulled out my Clymer
71-77 Vega guide. Maybe I'll show this to the mechanic
tomorrow. Thanks! Brad
[This is message #29735 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: vegasvega1_REMOVE_325522_THIS_@yahoo.com
Lee, We have AutoZone here in Las Vegas. I'll buy
some of that and we'll try re-bleeding the brakes. I
am also wondering if they reset the rear brakes
properly by back up and going forward applying the brakes
each time. Thanks for your response. Brad
[This is message #29736 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Lee, We have AutoZone here in Las Vegas. I'll buy
some of that and we'll try re-bleeding the brakes. I
am also wondering if they reset the rear brakes
properly by back up and going forward applying the brakes
each time. Thanks for your response. Brad
[This is message #29736 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: vegasvega1_REMOVE_142064_THIS_@yahoo.com
Thanks for tip. Between the two other responses I had, I should be able to figure this out. Thanks! Brad
[This is message #29737 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Thanks for tip. Between the two other responses I had, I should be able to figure this out. Thanks! Brad
[This is message #29737 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: CJBIAGI_REMOVE_535999_THIS_@yahoo.com
Brad, whenever I have changes a master cylinder
it was mandatory to bench bleed the master cylinder.
According to what I have read it is next to impossible to
get all the air out of the MC by just bleeding the
brakes normally. Bench bleding it is easy, there a kit
with a couple of fittings and hoses that you route
from the MC fittings back into the resovoir. Then you
pump the MC until all the air is out and then install
the MC on the car and bleed the rest of the brakes. I
forgot what rear brakes you have on there but some are
automatically adjusted when you back up in reverse and apply
the brakes and others adjust by applying the
emergency brake. However you should still adjust them
manually to get them close to where they should be and not
rely on the self-adjust feature to get your initial
adjustment. Your on the right track by checking a manual, not
sure how good Clymer manual is but it's a start. Clyde
[This is message #29738 by user CJBIAGI on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Brad, whenever I have changes a master cylinder
it was mandatory to bench bleed the master cylinder.
According to what I have read it is next to impossible to
get all the air out of the MC by just bleeding the
brakes normally. Bench bleding it is easy, there a kit
with a couple of fittings and hoses that you route
from the MC fittings back into the resovoir. Then you
pump the MC until all the air is out and then install
the MC on the car and bleed the rest of the brakes. I
forgot what rear brakes you have on there but some are
automatically adjusted when you back up in reverse and apply
the brakes and others adjust by applying the
emergency brake. However you should still adjust them
manually to get them close to where they should be and not
rely on the self-adjust feature to get your initial
adjustment. Your on the right track by checking a manual, not
sure how good Clymer manual is but it's a start. Clyde
[This is message #29738 by user CJBIAGI on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: Phantom402_REMOVE_121458_THIS_@yahoo.com
IF you mean by bench test ,to bench bleed the
master cylinder, then if you didnt you still have air in
master cyl most likely.
One device I have come to
depend on in my Phoenix Injector brake bleeding system
and I reverse bleed the master cylinder on the bench
then have other mechanic help me bleed master cylinder
on the car by installing the lines then opening the
lines one turn have hime push down pedal and hold then
tighten up the lines and repeat till assured of no air in
system and then check pedal then if still low or spongy
I try bleeding the system starting from wheel
farthest from master cylinder.
Then recheck pedal
,usually I will have a good pedal and new brake fluid
through out the system.
Luck
Lee
[This is message #29756 by user Phantom402 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
IF you mean by bench test ,to bench bleed the
master cylinder, then if you didnt you still have air in
master cyl most likely.
One device I have come to
depend on in my Phoenix Injector brake bleeding system
and I reverse bleed the master cylinder on the bench
then have other mechanic help me bleed master cylinder
on the car by installing the lines then opening the
lines one turn have hime push down pedal and hold then
tighten up the lines and repeat till assured of no air in
system and then check pedal then if still low or spongy
I try bleeding the system starting from wheel
farthest from master cylinder.
Then recheck pedal
,usually I will have a good pedal and new brake fluid
through out the system.
Luck
Lee
[This is message #29756 by user Phantom402 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: Phantom402_REMOVE_295999_THIS_@yahoo.com
I actually forgot something,I use plugs in the
mastercylinder in stead of the fittings and hoses.
and
industry standard is now to use plugs instead of the other
way because in an effort to make master cylinders
more forgiving in use as they age and are neglected
the seals are being made softer so now they suggest
using plugs instead to keep the dry seals from rolling
the lips over and making them junk.
IF you use the
fittings and hoses please stroke very slowly and at first
in short strokes so the bore fills up with fluid
andhelps keep the seals intact.
lee
[This is message #29758 by user Phantom402 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
I actually forgot something,I use plugs in the
mastercylinder in stead of the fittings and hoses.
and
industry standard is now to use plugs instead of the other
way because in an effort to make master cylinders
more forgiving in use as they age and are neglected
the seals are being made softer so now they suggest
using plugs instead to keep the dry seals from rolling
the lips over and making them junk.
IF you use the
fittings and hoses please stroke very slowly and at first
in short strokes so the bore fills up with fluid
andhelps keep the seals intact.
lee
[This is message #29758 by user Phantom402 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: vegadad_REMOVE_875828_THIS_@yahoo.com
Lee,
No one has addressed air in the
proportioning valve yet. On my Vega and Skyhswk there is a
small rubber fixture on the front of the proportioning
valve, you may need to push it in a few times to clear
any trapped air in the valve. You would think that by
bleeding the system this would not be necessary, but it is
my feeling use everything available. I actually had
a friend with a Nova that was having problems with
his brake system. He bled his brakes several times
until he remembered to purge the proportioning valve,
once he did it cured his problem. My $0.02.
john b.
(in Virginia)
[This is message #29765 by user vegadad on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Lee,
No one has addressed air in the
proportioning valve yet. On my Vega and Skyhswk there is a
small rubber fixture on the front of the proportioning
valve, you may need to push it in a few times to clear
any trapped air in the valve. You would think that by
bleeding the system this would not be necessary, but it is
my feeling use everything available. I actually had
a friend with a Nova that was having problems with
his brake system. He bled his brakes several times
until he remembered to purge the proportioning valve,
once he did it cured his problem. My $0.02.
john b.
(in Virginia)
[This is message #29765 by user vegadad on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Wed Dec 31, 1969 8:00 pm
From: vegasvega1_REMOVE_610501_THIS_@yahoo.com
Thanks for the advice! Hopefully I'll get this fixed today.
Brad
[This is message #29767 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Thanks for the advice! Hopefully I'll get this fixed today.
Brad
[This is message #29767 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Mon Dec 31, 2001 10:02 pm
From: vegasvega1_REMOVE_125765_THIS_@yahoo.com
My brake pedal goes to the floor to stop. I have
a 74 Vega GT Wagon with a stock 350 V8 and
shortened 77 Camaro rear end, 14" wheels all the way
around. I have an adjustable proportioning valve to
adjust the pressure to the front and/or rear brakes. I
installed a new master cylinder yesterday, 12/29/01. My
brake pedal still goes to the floor unless I pump the
brakes or unless I pull the emergency brake part way and
press the brake pedal. The mechanics working on my
brakes say I need to remove the manual proportioning
valve which I've used since 1980. The brakes worked
fine until last Sunday, 12/23 when I did some off road
driving and also applied my emergency brake. Now the
brakes still go all the way to the floor. I told the
mechanic to power bleed the system because I think there's
still air in the lines. All of my wheel cylinders
apprar to be working properly and the lines are clear.
Has anyone else with a non-stock rear-end had this
problem? Any suggestions?
Thanks and Happy New Year to
all! Brad
[This is message #29696 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
My brake pedal goes to the floor to stop. I have
a 74 Vega GT Wagon with a stock 350 V8 and
shortened 77 Camaro rear end, 14" wheels all the way
around. I have an adjustable proportioning valve to
adjust the pressure to the front and/or rear brakes. I
installed a new master cylinder yesterday, 12/29/01. My
brake pedal still goes to the floor unless I pump the
brakes or unless I pull the emergency brake part way and
press the brake pedal. The mechanics working on my
brakes say I need to remove the manual proportioning
valve which I've used since 1980. The brakes worked
fine until last Sunday, 12/23 when I did some off road
driving and also applied my emergency brake. Now the
brakes still go all the way to the floor. I told the
mechanic to power bleed the system because I think there's
still air in the lines. All of my wheel cylinders
apprar to be working properly and the lines are clear.
Has anyone else with a non-stock rear-end had this
problem? Any suggestions?
Thanks and Happy New Year to
all! Brad
[This is message #29696 by user vegasvega1 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Mon Dec 31, 2001 10:27 pm
From: CJBIAGI_REMOVE_227450_THIS_@yahoo.com
Brad, just a guess but from what you have told us
I wonder if something didn't come loose or break in
the rear brake assm? The fact that everything worked
well until you went "off roading and applied the
emergency brake" makes me think something happened in the
rear brakes. Generally when the brake goes to the
floor I think master cylinder or a leak in the
hydraulic system. Also rear brakes that are not adjusted
will increase the pedal travel. But the fact that it
happened suddenly and after applying the emergency brake
still makes me think it has somethong to do with the
rear brakes. Also the fact that applying the emergency
brake seems to help points to the rear brakes again.
Did you bench bleed the master cylinder before
installing it? It could also be air in the system. At this
point it could actually be a combination of things but
I would focus on the rear brakes based on what you
have said. Clyde
[This is message #29700 by user CJBIAGI on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
Brad, just a guess but from what you have told us
I wonder if something didn't come loose or break in
the rear brake assm? The fact that everything worked
well until you went "off roading and applied the
emergency brake" makes me think something happened in the
rear brakes. Generally when the brake goes to the
floor I think master cylinder or a leak in the
hydraulic system. Also rear brakes that are not adjusted
will increase the pedal travel. But the fact that it
happened suddenly and after applying the emergency brake
still makes me think it has somethong to do with the
rear brakes. Also the fact that applying the emergency
brake seems to help points to the rear brakes again.
Did you bench bleed the master cylinder before
installing it? It could also be air in the system. At this
point it could actually be a combination of things but
I would focus on the rear brakes based on what you
have said. Clyde
[This is message #29700 by user CJBIAGI on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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V8 Vega Brake problems
by h-bot » Mon Dec 31, 2001 10:32 pm
From: Phantom402_REMOVE_926432_THIS_@yahoo.com
clean out the brake dust in the rear brakes and
adjust the rear brakes, re bleed the brakes and try
Performance Friction Zrated brake fluid for 10 bucks at Auto
Zone for 2 cans will do the trick.
Lee
[This is message #29701 by user Phantom402 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
clean out the brake dust in the rear brakes and
adjust the rear brakes, re bleed the brakes and try
Performance Friction Zrated brake fluid for 10 bucks at Auto
Zone for 2 cans will do the trick.
Lee
[This is message #29701 by user Phantom402 on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]
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