Ok, so for the past 3 hours, i've been reading all about heather's problems with her brakes, as well as everyone elses. I've definitely got some good ideas of things to check, but my situation seems just a little (very) strange.
Vehicle rundown. 93 Sidekick 4-door stock running gear, 30" tires, 2" body lift, (rear ABS)
While driving around town, all the time on the roads, i don't have any brake problems at all and i would say my brakes work well, well enough that there doesn't seem to be anything wrong with them.
When i've gone offroad the last 2 times i've had a strange thing happen a couple of times. Last month i was at Evan's with SnoFalls, and while waiting and watching him go up some ruts on an incline, my kick was just idling with the handbrake on. Then my turn to go, so i'm in first low, then go forward a fraction and hit the brakes to take a better look, and the pedal goes straight to the floor. Straight away i pump it again and the brakes are 100% there. I drive thru the obstacle, get to the top, and the brakes are still fine. About an hour or 2 later, i'm going downhill in a steep area, and i'm stopped for a second, and then it does it again, but i was hardly even moving. It doesn't do it when i've "really needed to stop", yet! So i brushed it off that there's something funny with the master cylinder or perhaps the booster, figuring that perhaps the vacuum was lost. So for the next month while driving on road, it doesn't give a hint of trouble.
This past saturday up at reiter, i got myself in a bit of a pickle and was teetering on my left 2 tires, stuck in what can best be described as peat moss/top soil. It was super super soft, and i sunk into an existing hole. So i was stopped by the log under me as well as the dirt holding me still. I sat there and idled for about 30 seconds (with the handbrake on, even though i wasn't going forwards or back), then i hit the brakes to release the handbrake to be winched back and the pedal hit the floor. Now the last time it happened, the next time i hit the pedal the brakes were right there. I hit the pedal about 4 or 5 times slowly to the floor and nothing happened (felt the same as flushing fluid out of the system with a bleeder open). Once again i was thinking "vacuum brake booster", so i hit the gas to "increase vacuum pressure" (all of this is me trying to figure out WTF this thing is doing), then the brakes were fine, thank goodness.
I jumped out before we proceeded with the winch to check for leaking brake lines, and didn't find anything, and none of the lines were overextended or hung up on anything.
I got unstuck, and long story short, drove home just fine.
I got home, checked every brake line, pulled and tugged on them, and not a sign of a leak. It felt like i had completely lost brake pressure thru the fluid. My fluid level has maintained full since before Evan's with no signs of leaking.
So there's what's happening.
I'm going to pull the rear drums this arvo to check the tensioner, springs and shoes and see what's happening. I'm wondering if maybe the wheel cylinders are not staying pressurized against the shoes on the off chance (but how could that happen). Could they retract themselves, requiring the pedal to have to be pumped for them to push out?
Each time this has happened, the hand brake has been on, so the shoes are out against the drums, which is strange for why i am having any problems.
It's so hard to diagnose something that's not visual, like a leak or something broken...
So anyone else had the "pedal to the floor" problem???