Thanks. I plan on bleeding the rear wheels this afternoon, so I'll see if that has any effect. I noticed a solenoid attached to the vacuum reservoir. I took it off, took it apart and cleaned and tested it. It is basically a valve that opens or closes the reservoir from the rest of the brake vacuum lines. Here is a pic:
Is this supposed to be activated when the brake pedal is pushed? I'm going to check for voltages later, and I'm wondering if 12v. is sent to the solenoid only when the brake pedal is depressed.
Thanks!