Vehicle: 1995 C1500 At 191,000+ miles it developed an axle seal leak. So I decide it's time to replace the factory brake shoes and drums also. After I put it all back together the brakes really sucked. I adjusted the little screw things some and then they worked ok. After just a short time, the parking brake pedal would just go to the floor and not engage the parking brake. I adjusted the cable and it worked so-so for about 2 weeks... now it does hardly anything again. What am I doing wrong?