hello thanks in advance for any help. I just bought a 79 with 1ton axles. I don't know what the donor vehicle was. My problem is my brake pedal is super low. I bled them and adjusted the rear drums, when I pinch the front brake hoses off I get a good pedal. It has a new master cyl. I think the master cyl. isn't moving enough fluid for the front calipers? so I'm not sure of my options... different calipers? different master cyl.? that being said I have no clue what ones I would need. I think this is a pretty common upgrade, but im having trouble finding information.