Brakes have me baffled!

Mikel, theres a rubber line going from the main front to rear line to the rear housing. Your steel lines could also be rusting. If they get thing they will pulse every time you step on the brakes til it pops.

To make bleeding brakes by your self easier, Take an big old jar ( I have a old glass helmans jar) a long piece of vacume line that you can push over the bleeder. Pop a hole in the cap of the jar for the other end of the hose and stick it in till its almost at the bottm. Fill the jar 1/2 way with clean fluid.

Now you can open the bleeder Hook the line up to it and start pumping. Because the other end of the line is submerge in fluid it wont pick up any air. Just keep an eye on the fluid level in the master. It will empty fast. And remember start at the furthest bleeder from the master and work to the closest.