This would be a better question to post in the General Tech and Repair, under axle and brakes. I think you will get a lot more responses.
I know I have front axle brakes so I am sure you do too. If you look at the back side of the tire you will see a break backing plate and drum.
How do you know that the front brakes are not working?
You have several places to look, your breaks are electrical, energizing magnets that mechanically engage brake shoes.
If it is both sides of front axle, it is probably at a brake wire connection going to that axle. There are two wires coming from the front that splits off to first axle before going to the next. Mine comes down the drivers side. One wire will be power, only powered when connected to tv and brakes are applied or when brake away pin is pulled, and other will be ground.
How handy are you? Do you have a multi meter? Are you willing to jack up and pull a tire?
If you pull your emergency brake away pin you might hear your magnet engaging(humming) which would mean you have power to the brake. With the pin out you could check for power going to each brake with a multi meter or a test light. Then be sure the ground wire is good by checking continuity to the frame.
If you have power and ground than jacking up the tire to see if they just need adjusting.
I think after that you’ll need to pull the tire and brake drum to see whats inside.
Over the years and multiple trailers, I have seen several blown grease seals, broken springs, broken brake shoes, broken or pinched magnet wires.
2011 Wildwood T26BHXL
2004 Yukon XL Denali
43yrs of camping; one lucky guy