brakes 1700 loadstar

[hardknocks]

got a 1977 Loadstar. Last fall when I stored it away for winter i had good brakes. I backed it out of barn this past weekend i did not have a stich of brakes NONE. you could pump the pedal as much as you want and nothing. master cylinder has fluid and no visiable leaks at any wheels. The vaccum line to the hydrovac was collapsed when engine is running and i removed line and check valves is holding when i checked it. i also removed filter from hydovac line and started truck and it still collapses the vacum line from engine. any ideas? I replaced master cylinder and hydrovac about 2-3 years ago.

 

[hardknocks]

I don't know what the issue was but removed the brake line going to hydrovac from master cylinder and pumped the brakes a few times and fluid finally squirted out . I hooked line back up. And there is brakes now

 

[FDChappie]

Might have stuck a piston somewhere. Might also be a good time to change the brake fluid.