Rock Hard pedal/1965 power brakes new MC

[mopar440]

1965 New Yorker wagon power drum brakes

Brakes went to the floor, so I replaced the master and bench bled.

On the car (engine off) I started to bleed, but ran out of time, didn't get fluid out of right rear wheel yet. Was able to.pump pedal multiple times, engine off.

Came back a few days later, and the pedal is rock hard, and can't get any fluid to any wheels yet

I assumed I needed vacuum to the booster, do I put on my vacuum pump at 25 inches not vacuum, no change. Is that enough vacuum? I assumed it was.

I've bled tons of cars with power brakes and dual master cyl, and have been able to at least start bleeding, but this one I can't. Single master, rebuilt.

I can't run it much, since there is no exhaust. Neighbors don't like that. Have not started it since installing new master. With the old one, the pedal did drop a bit when car was started, and I could hear that booster/vacuum assist sound

I'm sure I probably have a collapsed hose, but ALL of them? Bad master? Never had this.problem before, it has a single master cylinder.

 

[mopar440]

I should add that I can't suck any fluid from the rear wheels , and pedal is hard with a bleeder open too

I'm thinking about he proportion valve maybe is stuck

 

[Ross Wooldridge]

Prop valve (if original) is only a distribution block - no moving parts inside.

Sounds like you have a bad out of the box master... especially if all was working reasonably properly before...

 

[mopar440]

Thank you for the response,

I cracked the line coming out of the master, a little bit of fluid comes out but it's still pretty hard.

I did start it up temporarily and no change in the pedal.

 

[mopar440]

I removed the line from the mc totally, the pedal drops

I replaced that line, and the pedal moves, but still fairly hard

I ordered hoses, and can I replace all the hoses in a couple days. I just want the thing to move so I can move it around my yard in winter right now

 

[Ross Wooldridge]

Work your way down the chain...

Metering block,
Right rear,
Left rear,
Right front,
Left front,

Sooner or later it will manifest which hose it is.

 

[mopar440]

Turns out all three houses were bad, first time I've had that happen ,hoses fixed it

 

[Ross Wooldridge]

Glad to hear!