Glad y'all are okay!
Emergency Stop From the Passenger’s Seat
- Thread starter Below32
- Start date
Unsure. You should test it and let us know!
I can make an educated guess that the anewer is no. There’s no e-brake hardware on the front brakes. The manuals for others also warn to be careful in that it might be a bit unstable (because they only work on the rears that doing so on a corner can be a bit dangerous in some circumstances). It really is to be done only in the case of an emergency.
If it's rear wheels only my e-turns are going to become a lot more fun.
- Thread starter
- #26
Found an empty parking lot this morning to try this. It feels like all brakes engage as if you just stomped on the breaks. Not sure I would want to do that at full speed especially with a trailer in tow. However, if one pops the switch up then lets it back down fairly quickly it can act as a light pump of the brakes. Glad I tried it to see how it reacted and tried it as a quick pull & release. It is good info to have should it ever be needed. Winter ice and snow would make this even more interesting but a very reasonable experiment. I am a huge proponent of finding out how ones rig will react in a safe environment vs in the middle of an emergency. Will try the e-brake in a parking lot again when the trailer is attached. Curious to know if it transfers through the 7 pin.
You are smart. I encourage every owner to test to find the limits of their vehicle in a controlled environment.
I wonder if the fronts engaged due to traction control?
- Thread starter
- #29
That is what I am thinking.
Fronts are "engaging" because of the center differential. Cant be good for it.
The torsen center differential locks because of the difference in speed between front and rear driveshafts. This of course leads to the front wheel(s) to almost instantly slow to match speed of rears, and at that point it will begin to unlock before locking again.
The torsen center differential locks because of the difference in speed between front and rear driveshafts. This of course leads to the front wheel(s) to almost instantly slow to match speed of rears, and at that point it will begin to unlock before locking again.
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Assuming you're moving straight forward and there's no wheel slippage would there be any difference in speed between front and rear?
In snow, ice, and maybe rain I'm sure there could be and that would certainly stress the center diff.
I'll try this out someday but wouldn't experiment if traction is compromised.
I believe you're exactly right in that scenario. My experience with this is in subaru sti and audi quattro, mostly on dirt and gravel. STI has an adjustable clutch on the center diff to adjust slippage for (among other uses) using rear hand brake lever briefly to slide rear around without locking fronts. But that"s with the rears actually locked intentionally and clutch depressed on sti. The audi essentially locks the fronts.
I dont know how the rears will behave on LC with handbrake on dry pavement, and depending on available grip and tires etc., behavior could vary greatly as you say. It's something i want to actually try, but not in my own LC.
It's quite complicated trying to determine outcome of this theoretically with torsen torque split and auto trans, and k0, plus rapidly varying friction. Out of my depth for sure with very limited knowledge of LC design.
I'll try it out! As others have said it will be a good thing to know how it will react. Hopefully not like the old e-brakes that never worked in older toyotas, nor like others that locked up just the rears(unless you were intentionally trying to bring the rear end around).
I tested this out on a loose gravel road so I could try to see which wheels were doing the braking.
Also had traction control off (car with swervy lines button).
Stopping hard with the brake pedal all four tires skidded in the gravel.
Using the park brake stopped the Cruiser possibly faster than using the brake pedal, but no skidding.
Probably like @MSINAL said, the front tires are helping also but not being braked with the front brakes, just the front axle being slowed through the drivetrain/center diff.
It was weird that using the park brake was more of a anti-lock feel than the pedal.
Also, after stopping the Cruiser with the park brake, the park brake was set and had to be turned off manually or by putting the truck into park and then drive again.
Also had traction control off (car with swervy lines button).
Stopping hard with the brake pedal all four tires skidded in the gravel.
Using the park brake stopped the Cruiser possibly faster than using the brake pedal, but no skidding.
Probably like @MSINAL said, the front tires are helping also but not being braked with the front brakes, just the front axle being slowed through the drivetrain/center diff.
It was weird that using the park brake was more of a anti-lock feel than the pedal.
Also, after stopping the Cruiser with the park brake, the park brake was set and had to be turned off manually or by putting the truck into park and then drive again.
I was also surprised by how rapidly it decelerated. Seems they really considered the emergency use case.
You should take your trailer out for Labor Day and test it so we don't have to wait so long.
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