First time having manual brakes, are mine bad?

Did some google searching.....

Some things mentioned - not to exclude the rest of the input....

1. possible that the MC diameter is not large enough to work the larger caliper reservoir beings the back brake MC reservoir is smaller. and is designed to work with rear wheel cylinder with less fluid.

2. One of the kits mentioned stated that the emergency brakes must be adjusted properly for the rear calipers to work right. Make sure you follow the directions for adjustment. If not adjusted properly the piston would have to travel to far and run out of travel. Does your emergency brake work properly when applied? One suggestion I read was to partially apply the emergency brake and then apply the brakes to see if there is a difference. That would suggest travel distance problem - out of adjustment.

3. Your not getting brake pressure to the rear brakes. Check your pressure and for any restrictions kinks, clogs foreign matter inside the brake lines...Perhaps flushing the lines.

4. Oh - did you mix up the front and back brake lines to the master cylinder? It happens.....

5. Make sure you are connected properly at the proportion valve.

6. Get a MC with a piston diameter as small as possible

You are not alone! Here is another mopar forum thread complaining about the same thing. You will have to take your time and read through all of the suggestions. It still comes down to pressure.

New disc brake conversion doesn't work

Some people mention brake peddle ratio switching brake peddles from a manual brake system, installing a 7/8" master cylinder, adding an adjustable proportioning valve..etc.

Hope you find the problem because many people have had this problem and would be eager to hear about a resolution!

Good luck!