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When bleeding the brakes on my 1970 Mustang I noticed that the pedal doesn't go all the way to the floor. It bottoms out about 2/3rd's the way down. I checked the booster rod to master cylinder clearance and the rod seemed to be about .015 deeper than the master cylinder. I adjusted it so it was nearly perfect and it still acts the same. The only thing that changed was now it has slightly more free play in the pedal.

Is it normal for the pedal not to go all the way to the floor on a 1970 model?
 

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Your proportional valve has probably shifted and is blocking off the rear or front port(depending on which you were bleeding). I took out the brake warning switch on the block with the piston centered then inserted a pin to prevent it from shifting. Do the bleeding and then replace the brake switch.
Steve
 
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