Soft rear brake after recall

Here's a crazy thought: Has anyone noticed the hill hold function having an effect on rear brake softness? Might be total coincidence, but I had great rear brakes until the week after the first time I tried Hill Hold. Took a long ride yesterday after pumping up the rear brakes and they went soft again after using hill hold.

I know correlation isn't causation, but Hill Hold does manipulate the rear brakes, right? For the owners who have had great luck with the warranty brake fix, do you use hill hold?
 
The online service manual has it, as does the searchable PDF download of the service manual on this website under Resources. It's first mentioned on page 1,075 of the PDF.
 
I had the recall lager module put in and was fine for about a year or better but now it is returning. It does pump up with one push of the pedal but it’s still not right.
 
...good point...after reading what you have said i have disabled the hill hold to see if it helps....air is getting into the brake line from somewhere ...could be there..