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I have a 76 s30 280z with the toyota 4 piston calipers installed up front and stock drums in the rear. I just installed a used 81 s130 280zx brake master cylinder and booster. Both bmc and booster were taken off a junkyard 280zx. The install was pretty easy and straight forward. Just had to take off the spacer and flip the booster and everything bolted up fine. I have bled the brakes in the proper order but there is a problem. The brakes don't work. Basically with the car off the brake pedal builds no pressure. The pedal is spongey about 3/4 of the way down and then super loose at the last 1/4 When the car is on there is absolutely no pressure or resistance or anything. The pedal just goes straight down to the floor with no effort. The brakes don't even work a little. From what I can tell there are no leaks. I read it might me be a push rod issue or brake pedal linkage? Any other suggestion on what the problem might be?
