1970 Blazer Brake Question

[1970cstblazer]

Are you using DOT 3/DOT 4 or DOT 5 fluid?

[72ironmike]

I apologize in advance because this probably isn't much help. Is linkage from brake pedal to master engaging ? Does the pedal pump up from floor when you bleed brakes ? You say you get no air but do you get a steady stream of fluid from the wheel cylinders ? You know it is gonna be something simple ! You have done way to much work for it not to be.

[Chad22873]

The pedal comes back up. The brakes engage at all 4 wheels when the pedal is pushed down. They just dont engage tightly enough to stop. I do get a steady stream of fluid at all 4 wheels. The last time I bled them yesterday I actually put a gallon of brake fluid in the power bleeder and let each wheel run until it filled up a 16 oz cup. No air the whole time it ran at any wheel.

[Getter-Done]

Do you still have the Original master cylinder for comparison?

[notsolo]

Did 70 have Brake booster? Rod length between master and booster could be too short. Prop valve?

[72ironmike]

Originally Posted by notsolo

Did 70 have Brake booster? Rod length between master and booster could be too short. Prop valve?

It sounds like this is all it could be.

[Chad22873]

It did have a booster on it when I got it and I replaced it with a new one. Perhaps the original did not and if I am buying an original master maybe thats an issue.

[Chad22873]

It does have a prop valve which is also new. I have rolled that around in my head many times but cant seem to think of a scenario where it would be the problem.

[Chad22873]

So even if the rod is touching the master when I bolt the master up, you guys think that perhaps the rod isnt long enough to complete a full stroke?
If so, does anyone have any idea how long the rod should be?

[Chad22873]

Unfortunately no.

[Chad22873]

Dot3