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Discussion Starter #1
I swapt out my master cylinder for a new one because I noticed paint was coming off my booster I had been bleeding them without luck
I bench bled my master and put it on and now I have no pedal at all... and when held in I get a hiss like air escaping is it the abs module or bad connection to the booster I'm stumped
 

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Khaki Nitro Nut
07Lifted,4X4,6sp-man,3.7L
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30,305 Posts
Sounds like maybe you have a tear in the booster diaphragm.
You can also try Vac bleeding with a pump at the wheels.
 
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Khaki Nitro Nut
07Lifted,4X4,6sp-man,3.7L
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30,305 Posts
Apply a vacuum to the brake booster line with a hand pump.
 

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a friend had this issue before but not on a Nitro it was a VW, it turned out to be trapped air, so you could try, fill the reservoir and leave the cap off, place a small container at each caliper to catch the fluid, open all the bleed nipples at the calipers and wait for gravity to pull some fluid through the system, close the bleed nipples one at a time when you think enough fluid/air has been removed, keep your eye on the reservoir don't let it get to the minimum mark or you will have to start again, then bleed the brakes in the normal way.
avoid over pressing the brake pedal, the more you press it the more the air is compressing and mixing with the fluid
 
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