I have a 1994 D90. I recently replace my brake light swith located on the way back of my pedal box. To replace the switch, I moved the pedal box, servo and master cylinder out of the way to get at the back of the pedal box. I did this by removing the 6 bolts securing the pedal box to the floor and pushing the pedal box up and out to get at the brake light switch. This moved the servo and master cylinder out of the way also because they are all hooked together. The brake switch worked fine.
However, the brakes did not fully disengage and the car ran with the brakes partially engaged grabbing and holding the vehicle back.
I tried adjusting the brake light switch. Brakes continued to grab.
I removed the brake light swith. Brakes continued to grab.
I withdrew the servo from the brake pedal box by removing the clevis pin from the brake pedal and withdrawing the servo from the pedal box. Brakes still grabbed.
I then removed the master cylinder from the servo and withdrew the servo from the vehicle. Brakes stopped grabbing.
Do I have a faulty servo or master cylinder?