HELP ASAP - 77 T/A Master Cylinder and Prop. Valve Question - Hot Rod Forum : Hotrodders Bulletin Board -- Hot Rod Forum

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Old 06-25-2006, 02:01 PM
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HELP ASAP - 77 T/A Master Cylinder and Prop. Valve Question

I gotta do some emergency repairs on my freinds 77 trans am, AGAIN in the sears parking lot, AGAIN. lol

A while back, the pedal was hitting the floor, i replaced the master cylinder, bench bled, etc. Ran good for a while, he went to work, came out and no brakes. Weird. Pedal goes right to the floor again.

So today, i went a took a look at it, bled all 4 wheels around and still.. to the floor.

Im thinkin the master cylinder (bought from autozone) is defective, or i didnt bench bleed it right, or something entirely else is wrong.

I read around about having to press in the proportioning valve, ***. I have no clue as to push it in, is it the round cylinder thing or the tiny hole on the cylinder thing i have to push in? A website stated to use a c-clamp but i couldnt get a c-clamp to even fit in that area TO push it in.

What are the chances of the proportioning valve being the culprit?

Thanks for any help!

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Old 06-26-2006, 01:52 AM
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re:HELP ASAP-77 T/A Master Cylinder and prop. valve question

if it wasn't bled right it would'nt have worked from the beginning. chances are it is failure of the master cylinder. make sure that one of the rear wheel cylinders isn't blown first. when bleeding master cyl. make sure you do short strokes, going to far in could be damaging.
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