How it works…..
There are two switches on your brake pedal linkage on your 2012. As you depress the pedal, the first switch to actuate is the brake light switch. You know what that one does. As you continue to depress the pedal, a second switch then actuates. That is the low pressure switch. That switch actually measures the amount of brake pedal TRAVEL. When that switch actuates, it signals the ECM to check brake system pressure. If the pressure has not exceeded 500# with that amount of pedal travel, then you get C1282. So, it’s a brake pressure vs pedal travel check.
The pedal can still feel firm, it has just travelled too far before pressure built up, based on what the engineers expected.
Historically, this is usually a sign that your brake system is overdue for a flush and replace with new fluid. Any idea if that has ever been done on that machine? It also can be a sign that brake pads are over-worn and need replaced. You asked about front brakes a couple years ago. Did they get replaced?
There have been folks that have had issues with road dirt and muck building up inside of that little enclosure where those two switches are. It interferes with operation and causes the switches to stick or not release when required. They’re just micro switches with little actuation arms on them. It doesn’t hurt to rinse out that area. The switches are sealed. Crawl around under there and you’ll find it.
Seldom is it actually a leak or master cylinder failure. 99% of the time, it just needs maintenance.