[86c20]

air!!!!!! you have air in the brakes and the hydroboost. you never fixed the brakes did you? like was said before the peddle will be hard to push with no boost to it it works the same way as vacc does. fix your brakes bleed what ever it needs then if its still messed up we can dig in more. bleed it out if that dont work check what the master is doing. the brakes in these trucks are simple so dont over think it. i have done the brakes on 8 trucks all the same system both vac and hyrdo. for ten years now. problems are simple if you keep it basic