Breaks weak

[traceR1985]

Hey guys so i have a 85 k20 and i can not figure out whats going on with my breaks they work they are just very low on the pedal where i have to press it all the way and they engage hard i also am not getting any fluid out of the bleaders on the back, i am trying to explain this the best i can lol. I don’t have a vacuum leak to my booster could it be my proportioning valve? Let me know what u guys think, thank you

 

[Grit dog]

Could be proportioning valve, LPSV, crusty wheel cylinders, master cylinder.
Not knowing age of parts and what you e done so far makes it tough to diagnose. But start with prop valve and reset it imo.

 

[Ricko1966]

Hey guys so i have a 85 k20 and i can not figure out whats going on with my breaks they work they are just very low on the pedal where i have to press it all the way and they engage hard i also am not getting any fluid out of the bleaders on the back, i am trying to explain this the best i can lol. I don’t have a vacuum leak to my booster could it be my proportioning valve? Let me know what u guys think, thank you

Is the brake warning light on? If so no fluid to rear and warning light on,my first suspicion would be combination valve not centered.