aknotts
Well-Known Member
I hvae a 73 sattellite with all new brake components, stock replacements on all components with the exception of the proprtioning valve, which is a new, as close to stock, as possible.
Power Disc/Drum setup.
The brake pedal is very soft, almost no brakes when pushed and travels all the way to the floor. It will stop but barely.
The brakes have been bled using every method known to mankind, gravity, vacume, and the old fashioned push the pedal methods. I am fairly certain there is no air in the system.
I decided the new master cylinder must be bad, so I replaced it, and still have the same issue, everything I know tells me this one is bad also, but I want to get some advice from those on this forum before swapping out another new master cylinder.
Some things I have done to troubleshoot are:
1: Adjusted the back brake shoes all the way out, and re-bled everything. no difference
2: Blocked off both lines at the mater cylinder with plugs. (This made the pedal rock hard as expected, and no sinking pedal)
3: Blocked off only front line at MC and left rear hooked up. This gave me a descent pedal feel and back brakes were working.(this tells me my issue in front system)
4: Blocked off only rear at MC with front hooked up. (back to a soft pedal traveling to the floor.)
5: I have adjusted the push rod from the vacume booster to every possible position, even to the point the brakes are applied withouth the pedal, and still have a soft pedal with too much travel.
The front brakes will engage to the point where you can not turn wheel by hand.
I have been told that maybe the mater cylinder plunger is too small and not pushing enough fluid, how would I confirm that?
Maybe there is still air in it, how would I know that?
Yes I bench bled the mater cylinder.
There are absolutely no leaks anywhere.
I am not opposed to buying a new new aftermarket type MC if I can be sure that is the issue, and someone can recommend a specific one that will work.
Confused and getting impatient. I want to get this resolved so I can move on to the next system.
Please help
Power Disc/Drum setup.
The brake pedal is very soft, almost no brakes when pushed and travels all the way to the floor. It will stop but barely.
The brakes have been bled using every method known to mankind, gravity, vacume, and the old fashioned push the pedal methods. I am fairly certain there is no air in the system.
I decided the new master cylinder must be bad, so I replaced it, and still have the same issue, everything I know tells me this one is bad also, but I want to get some advice from those on this forum before swapping out another new master cylinder.
Some things I have done to troubleshoot are:
1: Adjusted the back brake shoes all the way out, and re-bled everything. no difference
2: Blocked off both lines at the mater cylinder with plugs. (This made the pedal rock hard as expected, and no sinking pedal)
3: Blocked off only front line at MC and left rear hooked up. This gave me a descent pedal feel and back brakes were working.(this tells me my issue in front system)
4: Blocked off only rear at MC with front hooked up. (back to a soft pedal traveling to the floor.)
5: I have adjusted the push rod from the vacume booster to every possible position, even to the point the brakes are applied withouth the pedal, and still have a soft pedal with too much travel.
The front brakes will engage to the point where you can not turn wheel by hand.
I have been told that maybe the mater cylinder plunger is too small and not pushing enough fluid, how would I confirm that?
Maybe there is still air in it, how would I know that?
Yes I bench bled the mater cylinder.
There are absolutely no leaks anywhere.
I am not opposed to buying a new new aftermarket type MC if I can be sure that is the issue, and someone can recommend a specific one that will work.
Confused and getting impatient. I want to get this resolved so I can move on to the next system.
Please help
