Since World War II, aircraft have had anti-skid braking systems, and the earliest anti-lock braking systems on automobiles date back to the 1920s. Whatever the problem is since fixing it would be much too expensive cause it’s time consuming work, which would cost more than what the car ‘s retail value is.Guide to understanding, troubleshooting and diagnosing your ABSĪnti-lock braking technology has been around for nearly a century. When it stays off for a long period of time then how did it just fixed itself. If any obviously possible cause is there why doesn’t it stay on permanently and never go off. On or off lentgh of times are inconsistent. When it wants to go on, it does so when I reach 15-20 miles after starting to drive and it either stays on or goes on and of f while driving. It comes on and/or goes off when and where it wants and stays on or off for as short or long as it wants. My dashboard ABS indicator light seems to have a mind of its own. I have a 1997 Lincoln Grand Marquee LS I drive very little. Specially if there is scan data showing the poor system operation, not always 100% but pretty accurate most of the time, an oscilloscope will prove out a bad part in the trained hands of an electronics technician. Under all circumstances, there should be a code in the computer but the problem here is, can the free code readers at Autozone or other places read ABS codes and TCS codes? I feel a paid diagnosis is better than swapping parts based on a guess. Many suggestions given are sound advice, dirt, metal fillings on the magnetic pick up, loose wheel bearings, too much air gap from the tone ring to the sensor due to improper installation or corrosion pushing the sensor out away from the tone ring where the spindle will need cleaned out with sand paper or other course cleaning procedures to allow the new sensor to be installed easily. On other vehicles when the VTC or other related systems have a problem, it will also affect the ABS and possibly the Emergency brake light, this does not mean you have 2 or 3 problems, only one system can affect all 3, Trac Control uses the ABS system to control traction so they are interlinked. Hook up a volt meter or test light that can be monitored, the pump should not be pumping too much. Locate the ABS pump and see how often it is running, sometimes it cannot be heard from inside the vehicle while driving down the road. The leak can be an internal seal leak and you will not see it on the outside of the ABS module so beware. The vehicles that correct itself after turning the engine off OR when the ABS light comes on, then the entire system is disabled and the pump stops, so no more feedback in the brake pedal. Inspect the ABS unit for leaks of brake fluid, even very small wet spots, some the problems listed seem like pressure problems, the ABS pump is trying to keep the ABS unit pressurized but its leaking.

Abs fault problem peo 206