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Old 10-21-2019, 10:49 AM #31
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My last set looked like this:

They're due again. I just haven't had time to do it. Unfortunately it's looking like I'm going to have to cut them out again. I loaded them up with anti-seize, and it seemed to work pretty well at first. I had them out last fall, but this fall they're just totally seized again. I bought some rubber boots that totally cover the entire lower area and I'm going to try them next and fill with grease to see if that helps.
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Old 10-21-2019, 02:34 PM #32
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Quote:
Originally Posted by Jetboy View Post
Also if you don't reset the zero point expect rear brakes to wear faster due to b the portioning being off.
Sorry, can you explain what you're talking about here?
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Old 10-21-2019, 05:47 PM #33
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Quote:
Originally Posted by brtnstrns View Post
Sorry, can you explain what you're talking about here?
Brake pressure is split front/rear. Prior to modern electronics almost all vehicles had brake proportioning valves attached to the rear suspension. More weight on the rear compressed the rear suspension and a lever would automatically adjust the amount of brake pressure to the rear axle. So if you had more weight - more of the braking would be done by the rear - where the weight was.

I'm not an expert on the brake system in the 4Runner but I am reasonably confident that it performs the same brake proportioning through the vehicle pitch (rake). The 4Runner has a set of sensors that measure pitch, yaw, tilt, etc. You can reset the "zero point" that is a baseline for the ECU when empty. If you don't do that - and you "level" your 4Runner, it thinks you have a few hundred lbs of cargo in the back all the time. Then the driver complains that the rear brakes were worn out in 30k miles. It's a result of the 4Runner thinking you're hauling a bunch 4-600lb of cargo all the time and using the rear brakes much more than it should be. It can also cause issues with VSC engagement and other safety features that rely on the pitch as an input to determining vehicle loading and predicting behavior.

This is how to do it:
Zero Point Calibration question
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Old 10-21-2019, 06:46 PM #34
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Quote:
Originally Posted by Jetboy View Post
Brake pressure is split front/rear. Prior to modern electronics almost all vehicles had brake proportioning valves attached to the rear suspension. More weight on the rear compressed the rear suspension and a lever would automatically adjust the amount of brake pressure to the rear axle. So if you had more weight - more of the braking would be done by the rear - where the weight was.

I'm not an expert on the brake system in the 4Runner but I am reasonably confident that it performs the same brake proportioning through the vehicle pitch (rake). The 4Runner has a set of sensors that measure pitch, yaw, tilt, etc. You can reset the "zero point" that is a baseline for the ECU when empty. If you don't do that - and you "level" your 4Runner, it thinks you have a few hundred lbs of cargo in the back all the time. Then the driver complains that the rear brakes were worn out in 30k miles. It's a result of the 4Runner thinking you're hauling a bunch 4-600lb of cargo all the time and using the rear brakes much more than it should be. It can also cause issues with VSC engagement and other safety features that rely on the pitch as an input to determining vehicle loading and predicting behavior.

This is how to do it:
Zero Point Calibration question
Wow, thanks. I've worked on cars basically since I was a fetus and I never once considered the fact that changing the suspension would have an effect on the brake system. You're also the first person I've seen bring it up since I joined here which is kind of crazy with all the suspension modification threads that pop up on a regular basis.

Appreciate the info.
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Old 10-21-2019, 08:14 PM #35
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Quote:
Originally Posted by Jetboy View Post
My last set looked like this:

They're due again. I just haven't had time to do it. Unfortunately it's looking like I'm going to have to cut them out again. I loaded them up with anti-seize, and it seemed to work pretty well at first. I had them out last fall, but this fall they're just totally seized again. I bought some rubber boots that totally cover the entire lower area and I'm going to try them next and fill with grease to see if that helps.
Yeah, wow that thing is cooked, burnt to a crisp. Mine don't look anything like that, I get a fair bit of briny road driving too (well you know what they do to roads here) What boot did you come across? Curious. The grease packing has been working for me but hey if the boot fits
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