Master brake cylinder - Got it...

[cowboy]

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When I push my brakes normaly, the car brakes nice..
If I hold a sligth pressure, like waithing for a stopligth or cruizin in a row, suddenly the brake-pedal dissapere down to the floor, pretty fast..
When I get of it, it's back to normal..

My guess is, it's the master brake cylinder, - rigth..

Is this an original 71 cylinder..

Where do I get a new one...

[GoodysGotaCuda]

Yep,bad master cylinder. Start with some rust killer on those line fittings before you attempt to remove it 

[cowboy]

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Rust killer, - yeps..

Will I have to remove it all the way to the pedal, or will it come of just to the power booster..

[GoodysGotaCuda]

It'll come off at the booster for ya

[JH27N0B]

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Is this an original 71 cylinder..

Where do I get a new one...

It looks like an original Bendix that would be correct for a '71.
If you don't mind aftermarket you should be able to find one at most parts stores, new or rebuilt.
If yours is an original Bendix, don't throw it away!  There are rebuild kits available or you can send it out to have it rebuilt.

[cowboy]

-Well, - here in Denmark, "most part stores" aint got it..
They only sell  parts for European and Japaneese cars..   

I need a "part-pusher" with a net store..

[Moparal]

I'm out of town for a week more , if yer not in a big hurry, you can have me ship you one from here. I believe I helped you before. I would be getting it from a local parts house

[Moparal]

By the way, I just looked at my 70 MC  I got from car quest. It looks just like that. But mine doesnt have a chrome top

[cowboy]

 
I think I can reuse my crome top..

I'll see what I can find, orelse, - you can send it together with the air-cable I have comin up..

[cowboy]

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Got it fixed...

Could'nt re-use the crome top, - not exacly identical when i resived the new one..

But the car brakes fine...

[Chryco Psycho]