Yellow ABS light of trailer stays on

That is correct. The difference with air brake systems is the time that it takes for the air to bleed off when the controller releases the brakes. Air brake systems can only cycle 2 times per second at best, while hydraulic ABS is much faster.

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If by skid you mean locked up wheels, that is my understanding also.

Not trying to be a smart guy here but there have been times where I feel certain I could have stopped faster if the ABS didn't kick in.

I think you'd stop way faster on dry asphalt by locking them all up (except steers) and smoking them. There is lots of resistance there.


Or what If I am able to get the right side wheels on the gravel shoulder and lock them up? Wouldn;t that stop me faster than if they didnt lock me up?

Or even if I jacknife the trailer into the ditch or a tree. Almost anything is better than running into the back of a fourwheeler with 2 kids in the back.

I thought the (original) reason for ABS was to allow you to maintain the ability to steer...i.e. not lock the front wheels up.

 

You could, and probably get even results, but having one side brake more efficently would mean a pull to that side, which is undesirable.

Yep it should in theory preserve steering to some degree, but I cannot say that was the specific purpose (perhaps I should have just said betters vehichle control?).

Its a safety devise, one that in my car has proven very useful in Michigan weather. The post before yours, or right after my last post explained a lot to me. I did not realize that air systems had THAT level of inadequecy.

 

You're still correct. The purpose of the ABS is to prevent lock up to maintain ability to steer/stop. A locked up wheel can not steer, and a locked up wheel can not stop the vehicle. Although truck brakes because of the air component cycle less, the concept is still the same. Preventing lock up. There is a reason it's sometimes called "controlled braking".

A wheel locked up is already skidding, let up and let it roll a little and reapply and it slows the progress of the vehicle without putting it into a skid...so the same theory you understand, works the same regardless the vehicle type.

 

Come on man. Where do you come up with this stuff?

 

Its a scientificly proven fact (ok, it CAN but not effectively). A locked up wheel will stop more slowely than a wheel that has slightly less braking pressure but isnt locked up.

 

That's not what he said. He said a locked up wheel cannot stop a vehicle which is complete BS. Silly statement like that makes him look like he's 16 yrs old and never locked a vehicle up to a stop. And it calls into question every other "scientific fact" that he throws out there.

 

I knew what he meant, and Im sure 99% of everyone else that reads his post will too...

 

There,s not to many co.s that will send ya to a shop for a abs light. The quick fix is to pop the light out, then put 2 strips of black tape on the female end , now put the light back in. And whala your repaired . If the male prongs don,t make contact with the metal on the female end. The abs light will not light up, I think I learned about electricity in 1st grade. If you drop the trailer at your terminal, go ahead and tell your shop, 10 bucks says they don,t repair it.

 

I've been sent/gone to a shop every time I've had an ABS malfunction. The trick is, you refuse to drive a vehicle that does not function as it is supposed to. That's your job. And then you don't just drop it off, you follow-up....because sooner or later, you're going to get that trailer back.

It's because people don't want to do their jobs, that the problems exist in the first place.

Doing so, it became apparent to a couple people that we had a problem. Turns out, the one "mechanic" that was doing the PM's and DOT annuals on the trailers didn't know what he was doing, and the home made tester being used, was wired wrong. That was because another mechanic and myself, didn't give up fixing the things and tracing the problems down. Now, I seldom have to worry about the problem existing on the trailers, because they work as required now. Light on 2-3 seconds, then off. I listen to hear the solenoids testing themselves to know that my efforts have paid off.