Brakes problem... fluid is flowing somehow inside MC, OR NOT...

[Nacho-RT74]

OK... I have seen several times this problem on my car, around 4 times on last 2 months. Brake fluid is changing somehow from the rear brakes deposit ( front bowl ) to the front brakes deposit ( rear bowl ), causing empty on front bowl and overflow on rear bowl. Of course I loose brakes, I think of course mainly rear, since with emergency brake pressed I practically feel free the pedal brake.

Notes:

-MC is around a yeard old. ( Bendix )
-I had that issue when new ( just one week since installed  ) but problem just went alone once I filled again the front bowl.
-Started to have same problem around 2 months ago... filled again, then got brakes.... just a week later same problem, same solution, got brakes again. Two weeks later, same problem. Remove MC and changed piston seals with a new kit, and checked scratches on cilinder... no scratches or rust. Got brakes again untill last night ( a month later ), when filled again and got brakes.
-No warning light lightning on on cluster, and I'm sure dist block switch is good, same as wiring.

A friend of mine is on same problem since several years and frequently is on same deal. "Techs" ( I don't trust on brakes "techs" here ) are saying is dist block, but I'm not sure about it. I have not seen him latelly to ask if already fixed. He has changed the MC around 3 times on a year.
http://www.dodgecharger.com/forum/index.php/topic,14463.0.html

Please, post your thoughts

[Chryco Psycho]

bad master, the seal between the front & rear brakes has to be bad or installed backwards

[Nacho-RT74]

so you say nothing to do with dist block... how you can noticed a damaged dist block/prop valve...

Some "techs" here were saying about maybe fluid is flowing internally throught dist block and lines from one cilinder to the other

I'm sure seals are good installed... but who knows about quality of seals.

Ok this looks more a question related with this topic: http://www.dodgecharger.com/forum/index.php/topic,15136.0.html , so I'll keep my eyes opened to that.

But still opened to another thoughts