Hey folks, I'm looking for some car advice here. I bought a 2010 Ford Focus brand new in December 2009 for a commuter car and I have put 318,000 miles on it in that time and up until yesterday I have only had to replace the valve cover gasket (twice), a throttle position senor, and the thermostat, everything else has just been routine maintenance. On the way to work yesterday morning my brake pedal went almost all the way to the floor, and I was hoping it was just a brake line, but my mechanic called this afternoon and said it was the rear brake cylinder and since most kits are sold in pairs, he said it would make sense to do both sides. Cost of repair is $1,200 and I have a 2016 Focus with the same motor and manual transmission just waiting to get tagged into service. I feel like common sense says to junk the 2010 but outside of this issue it runs like a top! What would you guys do in this situation?