rear brake ??s

[zicc1835]

Re: Rear Brake Drum Questions
i would like to thank you both i am going to pull the backs off my 67 3/4 in a couple of days and this will help a whole lot .. had big trucks , years ago almost the same... i have a question i replaced the master and bled all 4 bleeders pedal is up and hard but brakes are still spunge at best ....after driving a while push down goes half way down and pedal pushes/ bumps like a skip back at my foot spungy need to mash on her to get one wheel to lock dont know which one locked believe it was rear couldnt see the tire mark any ideas
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36 1/2 Ton
67 small window Custom Camper 3/4
73 Custom 20