Quote Originally Posted by ballvalve View Post
Got a car without an emergency brake lately?
Actually, the new car I just bought uses a computer driven hydraulic system for the parking brake...there is no direct mechanical lever or pedal to mechanically operate the brakes. If the engine is running, it works on all 4 wheels, if it's not, it only works on the rear wheels. You pull the little switch up to activate, and push it down to turn it off.

As we've gone over multiple times, the code approved method is an expansion tank along with the factory T&P valve. If doing more makes you feel better, go for it, but millions of people don't do more and their tanks haven't blown up, nor do I expect that they will.