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The master cyl. has two resivors in it the large one is for the front brakes and the small one for the rears. Follow the lines coming from the front wheels to the block and the line from the large should go there. But it seems to me that the line had different size fittings so they could not get crossed up??
if master replaced sounds like air still in lines rebleed the brake lines start with passenger rear than driver rear -pass front -than driver front last..before bleeding check rear brake shoes are adjusted correctly
If you look at the master cylinder under the hood on the drivers side,you should see an aluminum box near the brake reservoir,that is the controller that you need to deal with.
The first thing to check is the brake lines, this lines rot and leak fluid, most times its the line going to rear wheels that runs along side of fuel tank along the frame,
Did you bench bleed the master cylinder before installing? Run lines from outputs on master cylinder back into reservoir and pump air out . Connect lines and bleed system, Start from back passenger wheel first then back drivers wheel then front passenger and last front drivers wheel.
check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now
could be wrong here but sure sounds like its out of fluid at the "master cylinder" look near the brake master cylinder for a seperate little container for the clutch. bleeding is tricky because it is small and wants to run out of fluid quick. you have to keep adding each time you bleed. Hope I helped. Thanks
as an owner of three gmc sierras, i can attest that the brake lines that run along the frame rail under the master cylinder inherently rust away and break. I wouldnt neccesarily think it was tampered with. but do check the condition of all of the lines including the fuel lines for excessive rust.
check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain
When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.
Gravity bleeding is when you just open the valve and let gravity pull the fluid down.
Keep in mind you must "prime" the master cylinder first before installing it, did you do that?
Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.
After this procedure you gravity bleed the brakes, then go on to the pedal technique.
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