Anti-lock brake question

[jackw3306]

In a straight line panic stop would the anti-lock brake system keep the tires from leaving skid marks? Specifically, in a 2002 VW bettle.

 

[ivymike]

hehehe... locking up the wheels from time to time can be good for your health.

 

[ivymike]

(in case that was too subtle, it makes it much easier to pick up passengers)

 

[Thecardoc]

Greg wrote" Who doesn't? There are good reasons for disabling the ABS at very low speeds that have nothing to do with signal dropout, I would be very nervous about buying a car that attempted ABS at such low speeds."

The answer to who doesn't was just about everyone when ABS first hit the market. The Bosch and Teves systems both had to undergo changes to limit low speed ABS operation. If you want to go with generalities, most systems older than the 2001 model year would be functional all the way to a stop. It was about 2004 before cutting ABS below 5mph became the norm.

 

[GregLocock]

Not on Bosch systems, in my directly related experience. They always had a low speed cutoff ever since we introduced them in 1992, since it caused a very amusing accident during development.

I find it hard to believe that Australia was unique in that regard, since snow is one of the surfaces that needs low speed lockup.



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Thecardoc]

Hi Greg.

Short return visit here, I'm not planning on spending any real time here in these forums. I just to let you know the last car that I had to diagnose for improper antilock operation was a 96 Lexus ES300, Bosch system. This vehicle could enter antilock operation inside the shop, under 3mph. The LF wheel speed sensor signal was erratic. VIN can be provided VIA e-mail if you want it.