ABS PROBLEMS NO LIGHT ABS PULSES WHEN COMING TO A STOP
You have one of two possible problems: either the ABS sensor on at least one of the wheels has failed, or the reluctor ring has cracked on at least one axle. Cracks in relutor rings will not usually be visible to the naked eye unless the ring is thoroughly cleaned and then has a fluorescent dye applied designed for crack detection.
A failed reluctor ring is the most common cause and the most expensive, but it will not show up on the on-board ABS diagnostics system: if the ABS warning light does not briefly illuminate and then extinguish when starting the car, then it indicates an electronic fault with one of the sensors. Sensors are far cheaper to replace, but you need specialist test equipment to determine which one is at fault or a dummy substitute sensor which can be temporarily substituted for each sensor to check which one is faulty.
If the fault does end up being the reluctor ring, then if you can comfortably replace a driveshaft yourself then it's an expensive DIY job. The cost can be reduced if you can obtain the reluctor ring alone either from the vehicle manufacturer or an after-market parts supplier, but it's not easy to fit. The old one usually needs to be cut off using a cold chisel (easy:one sharp blow and it usually comes away), the mounting surface thoroughly cleaned and then the new ring usually needs heating evenly to a cherry red colour to expand it enough to fit the driveshaft. When it cools it shrinks and forms a tight interference fit. Get it wrong and you have to cut off your expensive piece of metal and start again with another new one.
Apr 13, 2010 |
2002 GMC Sierra