Brake problem need help

94gtbrandon

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Friend of mine has 88 mustang gt has rear disc brake conv the problem he's having is the brake petal goes all the way to the floor he has brakes when he uses them but every once in a while they will be stiff then he lets off and pushes them again it goes to the floor he's replaced master cylinder brake booster checked brake lines blend them 3 or 4 times bench bleed the master cylinder but still does it any sugetions
 

97FloridaGT

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Did he change proportioning valves when he did the conversion? I'm thinking it's that.
 

Mustanger

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Flush the brakes lines thoroughly & put all new brake fluid in it, bleed ALL the air out of the entire system & see if this helps. This is a serious problem but should be easy to fix...you may still have a bad master cyl. good luck & be safe!
 

Musturd

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Seems like the didn't change the proportioning valve
 

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