Hello everyone, I have a 1957 Buick Century and am new to this site and I am in need of a vacuum diagram in the engine bay area. My problem is NO BRAKE LIGHTS. I installed a new switch on the master cylinder, checked fuses, and bulbs. The turn signals will work but not the brake lights. Seems like a loss of vacuum because when I start the car the brake pedal is hard and you hear what seems to be like air escaping. After warm up the brakes seem to work ok. Any help appreciated.