Quote:
Originally Posted by oni jake
One thing I think you are overlooking is that hydraulic pressure is applied in the path of least resistance. This is why ABS systems came about. The S-chassis is a 3 sensor system, and it is also a 3-channel hydraulic system. When the brakes are applied, the caliper with the least resistance is going to lock first. Pressure will NOT be a applied evenly to the rear calipers and both wheels will not lock simultaneously.
The ABS module is programmed to take that into account and tries to guess which side the tire slippage is happening by measuring the wheel speed of the front two wheels and the static drive train together. This is what I was referring to when I was talking about the physical braking dynamic is changed.
I tried google searching for a definitive answer and only found out dudes with jeeps have similar setups and similar problems when they put in a welded rear end to go muddin' and other hill billy shit. If someone else out there has a welded diff (not a 1.5, not a 2-way) in a S14 ABS model and ABS still works, I'll shut up and admit your greatness. I just can't find it.
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It's not about who's right or wrong man. It's an internet chat forum, and we are having a heated discussion. I have nothing against you other than my opposing ideas/understanding of the S-chassis ABS system.
I will agree with you that putting in a welded differential will change vehicle and possibly change braking dynamics, but not as drastically as you may think, especially with a welded diff.
The braking system will send fluid aft, in the path of least resistance, as you stated, but fluid pressure will equalize before enough pressure has been applied to the pistons to lock the rear breaks. Once fluid has filled that caliper with the "least" resistance, it will start to see resistance as the piston is pushed, allowing the opposite caliper to "fill" and start to apply pressure to the back side of that piston.
Regardless of which one locks first, and however minuscule the time delay/difference is, the ABS system is/was designed to pulse the brakes, and prevent the tires from reach the full lock and skid situation. It allows the driver to still have some control over the vehicle to prevent/avoid that possible collision that surely would've happened had the brakes locked.
IN his case, he has a welded diff. The rear shafts, even though they are independent of each other, are now locked as a single unit. If one break is applied, it slows down and "stops" the opposite wheel as well because there are no longer planetary gears to allow different wheel speeds.
Either way, this discussion has wandered from the main purpose of the thread. I honestly believe the problem lies within the electrical side of things in/on/around the rear diff. IF the OP were to ever come back and try some of the diagnosing we could further assist him.
I don't know everything "Jake", there is always learning to be had, but I'm not some forum retard that just posts random shit. I do have a bit of knowledge about cars and the inner workings. If your assumption was that I was singling you out, I wasn't and I'm sorry you took it that way.