I have a 2015 XLT with a 2.7 EB and 10,000 miles. Recently my brakes have been acting weird. Yesterday, I got in after about a 20 minute stop at the store, and the brake pedal went to the floor. Took my foot off the brakes and tried again and they were fine. It's had an inconsistent feel since I got it with 8,800 miles on it, but this was a new adventure.

Sometimes the brakes are REAL touchy and almost lock up if you look in the general direction of the brake pedal. Other times they respond normally. It acts like the brakes need to be bled, but only sometimes. The fluid level is fine, pads and rotors look normal. I know how to bleed brakes, but I figured I shouldn't have to with ABS. No strange or excessive wear. They're ALWAYS touchier when it's cold or wet out, and after a bath the brakes are downright impossible to modulate, almost like an on/off switch.

The dealer had it towed in this morning, so I'm waiting to hear what the issue is, but I was wondering if anyone else had experienced anything like this. This is my 3rd F150 and I've never had a problem like this.

 

IIRC the 15s had a recall about brakes someone will chime in with it or you can look few threads up at the recall list

 

Just got my truck back from the dealer yesterday. The master cylinder was leaking into the power booster. Apparently there is a TSB on 2015s for this, but my truck wasn't covered by the TSB. The dealer replaced the master cylinder and power booster and everything seems fine now.

 

Here's the service invoice for this. It probably wouldn't hurt to check your fluid level. There are a couple other threads here talking about this issue. It seems to be pretty common.