Thread: New power front disc brakes 67 GTO

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i would say look at the master it is for front disc brakes ? sounds like to me it is holding back brake psi . to check push rod just un clip it from the pedal with it unhook you should pull up the pedal up 1/8 or more so that you know you have free play i think the pedal has a stop ? you need to make sure you have some free play and not on the stop if so this will load the push rod

I checked the push rod connection to the pedal. There is at least 1/8" of extra play for the push rod at that connection. I am not keeping the rod from fully extending.
I will get my wife to help me tonight and I'll verify which brakes are not releasing. If it is the front(s), I'll check the hoses by opening the bleed screw.
I guess it could be one of the rears. I did not do any work on them (except to replace the rear brake hose) so I was assuming that they were OK.
The Master Cylinder is new, but I did fully compress the rod into the cylinder when I bench bled it. I later read that this is not a good thing to do, especially on an older unit, but mines new...
Could it just be air in the lines? I need to bleed some more?

I checked the brakes out with my wife working the brakes and here is what I found. The front brakes are not releasing. The rears release fine. If I crack open the bleed screw the front brakes release immediatly. So either both brake hoses are bad, or there is something wrong with the master cylinder. What are the odds that both new hoses are bad? I guess I will replace them first and see what happens. Could the MC be damaged and cause this? Thanks.