[sonnyts]

I know it sounds easy but i had great brakes before the line broke and i have bleed wheel cyl. and elev. rear of truck and bleed line at the end. its a 1979 k10 stock drum rear and the line broke at the bell housing on frame and drained a lot,someone told me that there is 10lbs pressure on the rear line i don't know but the brakes are not working ?
i can not figure it out

 

[Chris Miller]

Try bleeding them with a vacuum pump.

 

[sea_goin_dude]

On some vehicles where there is a high loop such as over the rear axle, while you pump them and bleed some of the air out, the air that isn't removed will travel back to the top of this loop. You may not be able to bleed it by pumping up the brakes while buddy opens bleed screw. May have to get shop with brake bleeding outfit to do it. they put enough pressure on the reservior to force enough liquid through the system without stopping to force that air out of the upper loop in your system.

---------- Post added at 03:12 PM ---------- Previous post was at 03:09 PM ----------

Vacuum at bleeder screw will work too just be sure fluid reservior has fluid in it otherwise you will suck air into the rest of the system.