I have a 2014 f150 fx4 3.5 twin turbo. This all started last with the park brake light coming on and a warning saying check braking system and every few braking attempts the abs started to come on as well (no lights just the abs when applying fresher to peddle). So I took it to get scanned and it gave two codes c109d and c109e. That led us to think vacuum pressure censor which I changed with no such luck. Looking for anyone who can help still trying to figure out and can't get into the Ford shop for over two weeks.

 

You actually bothered checking the brake fluid?

 

Yes that was the first thing checked before getting it scanned

 

Your ABS light is coming on when you push the brake pedal?
Have you ever flushed your brake fluid?

 

No abs light or any other warning lights. No haven't done brake line flush but it's worth a try. The warnings and abs also don't come on right away it happens after driving for a bit. Made it down the highway through town and was heading back home when it decided to act up today.

 

??????

 

No abs no other warnings besides the two in my original post which are the park brake and check braking system.

 

I'm wondering if it's a sensor in the master, i'd start with a flush if nothing else sticks out when looking at it.

 

I'm also getting a c109D code.i checked vacum with a guage and I am getting right at 30inhg at idle so very strong vacum.

 

Yes it ended up by being rubbed through wires drivers side wheel well behind inner fender.