ABS EEEEEEEEEEE stop on asphalt.j

[B.G. Smith]

On our recent trip to Tennessee and back pulling the 31' 5th wheel South bound just North of Birmingham Alabama I got into some congested traffic and probably was going 55 mph when I had to get on the brakes hard to keep from ramming a small car. It seemed to me that the front wheels were alternately locking or near locking and causing the steering wheel to pull from side to side. I could see in my rear view mirror afterward some black strips in the asphalt about 10' feet apart. The trailer has electric/hydraulic brakes and they saved me for sure. Just wondering if the ABS brakes were doing what they are supposed to do? bg

 

[Regcabguy]

Maybe your rotors are warped and the heat exaggerated the effect.

 

[Bob4x4]

The abs is designed to keep you in a straight linel-that it accomplishes. Stopping distance is another issue

 

[Ozymandias]

Properly working ABS makes NO Stripes on the Asphalt - that's for sure.

But the ABS in the 3.Gens are known to make Problems, they are really cheap crap manufactured.

Been there, done that.

 

[B.G. Smith]

Properly working ABS makes NO Stripes on the Asphalt - that's for sure.

But the ABS in the 3.Gens are known to make Problems, they are really cheap crap manufactured.

Been there, done that.

The black marks could have been my trailer tires but they were spaced out 8 or 10 feet apart. I do know that the steering wheel was alternately pulling left to right but the truck stayed straight ahead. bg

 

[p-Bar]

I rear ended a car and I don't think my anti lock worked I did a skid and slid right into him. I have no faith in this system

 

[sag2]

But the ABS in the 3.Gens are known to make Problems, they are really cheap crap manufactured.

I usually do not respond to silly statements, but I call BS on this one. Not sure where you are getting your information from. I'm sure a few people have experienced what they believe to be a problem with ABS operation, but with probably a couple million 3rd gen trucks on the road I would expect that.

 

[p-Bar]

If I recall Ozy had some issues with his and he had to get some Russians to hack into the ABS module to fix it .

 

[petersonj]

The black marks could have been my trailer tires but they were spaced out 8 or 10 feet apart. I do know that the steering wheel was alternately pulling left to right but the truck stayed straight ahead. bg

I think your ABS was working properly on your truck. Most people only experience ABS operation under emergency conditions and each person will evaluate their experience differently. If you were driving your truck (no trailer attached) at 55 mph and you made an emergency stop on dry pavement, you would probably observe the following marks on the roadway:

* The front tires would leave the heaviest skid marks during near wheel lockup (forward weight transfer) showing darker lines on the edges (compression of the tire).
* The rear tires would leave lighter marks, but as the rear tires passed over the front tire skid marks the marks would darken because you would be seeing the result of two skid marks - one on top of the other.
* None of the individual skid marks would be nearly as dark as a skid mark made by a skidding tire without ABS.

The above observations would be under ideal braking conditions. They do not take into account condition of tires, brakes, road crown, varying tire-to-road friction conditions, and many other variables - such as towing a trailer.

The ABS function is to stop wheel lockup during any braking condition. As a you can see because of the above mentioned variables, each wheel with ABS can be braking at different rates during a hard stop (the tug on your steering wheel), but the truck still steers straight and all wheels on your truck reach near lock up. This would indicate that the ABS is functioning properly.

Now, let's add a trailer to the mix. Assuming your trailer does not have ABS and that there could be minor differences of braking performance at each wheel, pulling to one side or the other during a hard brake could easily transfer to the towing vehicle (again, the tug on your steering wheel). Also, the trailer's skid marks would be added onto the top of the truck's skid marks, further darkening them.

I know that this is just another opinion, but what I am attempting to do here is pass on some knowledge that I have gained through conducting accident investigations at a transit agency for a number of years.

Hope this helps
-John

 

[B.G. Smith]

I think your ABS was working properly on your truck.

The above observations would be under ideal braking conditions. They do not take into account condition of tires, brakes, road crown, varying tire-to-road friction conditions, and many other variables - such as towing a trailer.


Hope this helps
-John

That sound reasonable to me, thanks for the replies. bg

 

[cerberusiam]

If I recall Ozy had some issues with his and he had to get some Russians to hack into the ABS module to fix it .

Yeah, ABS has to be programed with VIN. No local dealer requires a hack job. Doesn't really reflect on the quality just the nuisance level. LOL!

 

[Ozymandias]

Yeah that was the final End of my odyssey, i had fixed it Twice before because of the ****ing cheap made and soldered unit - and as nice goodie on top Chrysler was not able to delivery a spare part - out of stock abs unit, maybe because they sell them a lot?
Anyway, a used unit i found on ebay cant be used on a different truck once programmed.

Thats why a computer geek had to repair my unit.

And i stay to this - this units are bad engineering and cheap produced.
Soldering a 12 Pin Connector directly onto the mainboard and on the same board also soldering the heavy vibrating 6 actuators is asking for Problems.
At least the Connector should have a strain relief built into - that would prevent most problems.

 

[Bob4x4]

The abs is not made by any of the oems,there are only 2 or 3 mfgs in the world from what I have seen.Just like air bags