I've done it many times on things much steeper than your driveway without issue. Wait a minute, I've got rear discs, maybe you're on to something? Good luck with the disc conversion.For now, I vote that everybody try this maneuver just make sure that I'm not insane.
Try that maneuver? I converted my previous 97 TJ from drum to disk brakes and learned first-hand just how disappointing it was.Can't argue with that eh? Thanks! I still got the conversion at a killer price & still plan on using it. I'm tired of sounding like the Nazi tank on Raiders of the Lost Ark & I will post a flow up. For now, I vote that everybody try this maneuver just make sure that I'm not insane.
That is not how the proportioning section of the TJ combo valve works at all. The rear pressure is always a proportionate percentage of the front pressure until the pressure rises far enough to kick over at the knee point and then it rises at a lesser proportionate rate but it is still rising as the front goes up in pressure.Ya, as you press hard on the brakes the proportioning valve pretty much shuts off the rear brakes. If you are pushing hard on the pedal and the fronts don't lock something isn't right. Bigger brakes is true but really only for the fronts. I'm not trying to rain on the rear disc parade but it would really suck if you spend all the time and money and didn't fix the problem.
The easier much more simple solution is to reach down and pop it into 4 hi before you move the rig. I have a steep gravel driveway and the fronts will lock, skid, rig keeps going. Pop it into 4 hi, lock all the tires together so the fronts will do the work the backs can't do, and go have fun.My brakes function normal except in a situation where I am reversing downhill with my automatic in gear. There is very little stopping power. I can't even come to a complete stop. If do the same thing in neutral, it stops without hesitation. I used to have this downhill driveway, but have since moved. My Jeep is almost done with an engine rebuild & I haven't driven it in a while. I do recall the front brakes locking up on this busted driveway while the rears would spin in that particular situation. My concern is that I have a vehicle is that out of control when reversing downhill unless I pop it out of gear. While I am cognitive of that, I don't want it to be a risk if I'm out on a 3 or 5 point switchback. If that seems like a portioning valve issue, I'll follow that lead & yes this is an issue that nobody else has run across. All of us would rather have disk brakes over drums & I couldn't pass this conversion up regardless. I flushed most of the brake fluid when I put SS extended lines a little over a year ago.
Your front brakes are shit.So if my front brakes lock up & the vehicle is still in motion draggin the tires backwards downhill, it's normal? This only happens when my automatic is in gear. Out of gear it stops on a dime. It seems like the drivetrain is overpowering the rear brakes.
Which is it? Fronts lock and the rear tires are still turning?So if my front brakes lock up & the vehicle is still in motion draggin the tires backwards downhill, it's normal? This only happens when my automatic is in gear. Out of gear it stops on a dime. It seems like the drivetrain is overpowering the rear brakes.
All of my rigs have rear discs, makes no difference.I've done it many times on things much steeper than your driveway without issue. Wait a minute, I've got rear discs, maybe you're on to something? Good luck with the disc conversion.
Yes.Which is it? Fronts lock and the rear tires are still turning?
I'll keep coasting backwards in neutral knowing that my brakes work fine in neutralThe easier much more simple solution is to reach down and pop it into 4 hi before you move the rig. I have a steep gravel driveway and the fronts will lock, skid, rig keeps going. Pop it into 4 hi, lock all the tires together so the fronts will do the work the backs can't do, and go have fun.
You be you, I'll be me.I'll keep coasting backwards in neutral knowing that my brakes work fine in neutral
Stop imagining, find a safe, low traction hill to back down and have someone watch the front tires when they lock up.It's also possible only one front wheel is locking up. I would imagine it's next to impossible to lock up both of the front wheels at the exact same brake pressure due to variations in load on the left and right tires and variations in traction on the driving surface (unless a limited slip or locking differential was involved).
In that case, a front tire could still slip in 4WD, though there should still be an improvement in braking power.
Locking up both tires causes a loss of steering, and in reverse, locking the front tires could easily cause a fishtail.
Could ABS (or possibly a lack of) be exacerbating the issue?