Brake use question (2019 Freightliner)

Help me understand.....

My truck has 311xxx miles on it and still on the original brake pads on the steer axle and on the front drive axle.....

In January, at 223xxx miles, we replaced the pads on the rear drive axle.

I haven't had more than a dozen "hard braking incidents"( all after some ID10T decided to move too close in front of me and I just didn't want to be pulling pieces of vehicle from the grill. Go figure, that's not on my agenda for any day ending in "Y", as in Y me?


I don't understand why the difference? Is this something that is normal (in my family, we define the opposite of that)...

 

Ok, that said, if the slack adjusters are set PROPERLY, how long should brake pads last? Again, almost daily driving(less DOT breaks and a week home time every 6 weeks on average). Not many hard brake incidents, and using the engine brakes to control downhill speed( I set cruise for 5-10 below posted / safe speed and only manually intervene when engine speed gets to rev too high for too long)?

I am planning on getting the brakes looked at before the weekend due to the announced brake safety inspection blitz since my PM is due anyway.

 

Update.... boy I am glad I convinced the boss that we should do the PM earlier than planned just to get the brakes checked in advance of the DOT brake blitz.... I wanted to be wrong about needing them, but more importantly, I needed to be SURE as it's easier to deal with on our terms than to be told to do it by someone with a badge and have to pay for a tow or road call before continuing.

Turns out that, I needed all 6 brakes redone due to wear, remember that the steer axle and the front drive were original to the truck with 312xxx miles on them? Since the rear drives were already done 93xxx miles ago, we were shocked at the difference, this was never explained to us.

In order to pass DOT inspection, we also needed to replace 6 tires(both steers, 2 drives, and 2 trailer). Needless to say that this week cost us $$, but it could have been worse if I had an official inspection....