What is an ABS brake sensor The light used to be on constantly I had the brakes done and now it comes on intermittently?

Answer 1

All 4 wheels have a sensor on them.On the front it is just a magnet with a wire attached.Those two could have some mud or debree on them,not much to go wrong.Just clean the dirt off. The rear two are different. I will make this easy as possible. A four-wheel anti-lock brake system(ABS) maintains vehicle maneuverability,directional stability,and optimum decleration under severe braking conditions on most road surfaces.It does so by monitoring the rotational speed of the wheels and controlling the brake line pressure to the wheels during braking.This prevents the wheels from locking up on slippery roads or during hard braking. On 95-99 models,the hydraulic controlunit/motor pack assembly, is bolted to the left side of the master cylinder.The control unit/motor pack controles hydrolic pressure to the front calipers and rear wheel cylinders by modulating hydrolic pressure to prevent wheel lock-up. 95-99 models,the Electronic Brake Control Module(EBCM) is located above the left(drivers side)kick panel.The EBCM monitors the ABS system and controls the anti-lock valve solenoids.It accepts and processes information received from the brake switch and wheel speed senors to control the hydrolic line pressure and avoid wheel lock-up.It also moniors the system and stores fault codes which indicates specific problems. I should go on,but you are probably getting confused,so I'll put it in laymans terms.The rear sensors are installed in the rear brake backing plates;the toothed rings are installed on the back side of each hub and bearing unit.The air gap between the sensors and the toothed rings is not ajustable,and the sensors themselfs are not rebuildable.If a ring malfunctions,the entirer hub and bearing assembly must be replaced. SO TO PUT IN ONE SINGLE SENTENCE,,,Change the rear wheel hub bearings/wheel sensor. And if you have alot of miles do both rear.If your front bearings start to go bad it will SOUND like you have Knobby/Mud grip tires on it. You can tell the difference in the sound of a good one and a bad one. But me I would go to a salvage yard get one cheap take it home plug it up and see if the light goes off. Good luck www.autozone.com has diagrams you can see what is involved. Also check that the parking brake lever(foot or hand) is fully released,there MAY be a short in the button switch.