so when im in reverse the brakes will pump up and be normal but when i put it in drive and go they i loose what i had in reverse. dose anyone know what may cause this. thanks

Have you checked the fluid level and look for leaks? Did you bleed them?

yea the fluid is topped off and there are no leaks and i have also already blead them. now mind you i dont know if anything has ever been changed and if its all original. i basically loose all my brake power when i put it in drive and it feels like the back drums are the only ones working