need brake help plez!!!!!

[chevynova22602]

I have bled and bled my brakes I've even gravity bled them i can get a good pedal but I gotta pump it like crazy but if I just press pedal like normal it gose all the way to the floor
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[JOHNORO]

We have a lot of smart peeps here on the forum
But maybe you can fill us on why you were bleeding you brakes
Did you replace pads ? Shoes ? Master cylinder ?
This info may lead to a resolve
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[chevynova22602]

Oh lol sorry yea I changed master cylinder
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[jocko]

you didn't mention bleeding the new mc (which can be done before or after the install, but must be done).

Did you do that as part of the process?

[chevynova22602]

Bench bleed ? How exactly is that done
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[Stocker]

Check this link, or Google "bench bleed master cylinder" for many more links including videos.

http://www.superchevy.com/technical/.../0509sc_bench/

[chevynova22602]

Ok thanx
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[cdowns]

i see loads of guys who bleed brakes without ever reading a factory service manual which has great step by step instructions on how to do it correctly especially what to do with the prop valve

guess that $25 is too step a price to get it right

[chevynova22602]

Ok I bench bled and rebled the whole system Idk what's wrong with this flipping truck lol
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[chevynova22602]

Oh and still no brakes
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[MrHotRod5263]

What was the original reason for changing the Master cylinder?

What kind of problem were you experiencing before?

[chevynova22602]

Brake went out all together with no pedal at all now with new one I can pump it and get a pretty good pedal but if I just hit pedal without pumping it gose all the way to floor this has got me I've never had problems bleeding brake or changing MC before
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[MrHotRod5263]

in my opinion it sounds like 1 of 2 things

* there is still sir in system some where,

* or the master cylinder has an internal leak.

[chevynova22602]

That may be the problem may have got a bad MC didn't think about that but thanx a lot ill let u know what I come up with
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[GRX]

May still be air in the system. Only takes a very small bubble. How are the brake hoses? New? Old?

[chevynova22602]

They r old
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[Stocker]

Getting any air out of lines as you bleed them, or getting fluid with no air?

[chevynova22602]

Fluid with no air I've used a big bottle of brake fluid
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[Stocker]

I'm guessing no front discs so no proportioning valve to bleed -- correct?

[chevynova22602]

It has 1 but no bleeder on it but I think if they go bad it just locks up the front or bk braks depending on witch side gose bad
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[Stocker]

I'm drawing a blank unless your new MC is bad as suggested above. No idea how often new ones are bad out of the box....

[chevynova22602]

Well what made me think that was my buddy bought one that was bad but thanx everyone for the good advice maybe ill get it fixed if not ill replace everything from front to bk
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[CEE1NG_RED]

Also in the same boat... Maybe the drums has a big gap from the pads and adjusting the star adjuster may need to be done?

[chevynova22602]

Yea that may be something to look in to but I'm so mad at it rite now I don't even wanna look at at it lol but thanx I will look into that
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