well, Labor Day weekend, as we were on a trail, the LX started to become erratic on the brakes: brake pedal reacts hard to push, and as I push again, it seems fine - next time braking, first push is fine, second kinda hardish - let the truck roll a bit forward, brakes work fine - and also just fine the next time around, but further going downhill, hard-as-a-rock pedal - which resolved itself upon driving some more . . .
and so it went for about an hour, with progressively more episodes of hard brakes . . .
and, having just been through this in the 40 last year, I knew exactly what the problem was . . . - being on a trail with steep inclines was like sitting on a time bomb; I just wanted to get off the steep sections of the trail, pronto

- which, fortunately, the truck had the good sense to abide: the brake booster only finally completely failed just as I got onto the flat section in the creek bed . . . PHEEEWWW
from which there was still a 10 mile ride back to asphalt, but with moderate descents, so keeping the truck in LO, shifting manually, and in the steeper sections with 2 feet on the brake pedal, I made it back to the highway
after airing up, Michael decided he was going to drive the truck home for the next 20 miles on the highway (I followed in his Blazer) - fortunately, traffic was light, and there are only 3 traffic lights between the trailhead and our house . . .
where Michael had to go into low-range again, shift back to first gear, and -even though there are Marlin low-range gears in the transfer case- still had to put both feet on the brake pedal to control the truck going down our steep driveway into the garage
