2003 chev. silverado2500hd, abs goes off, pulsates when stopping
My brake pedal pulsates and abs goes off just when i am about to stop at about 3 to 5 mph, i had it checked at carx and they said they were getting a code from the right front wheel sensor, they said they wanted to replace front wheel bearings at about 500.00 a piece. help!!!!!!!!!!!!!!!!!!!
Gm has tech service bulitens on this issue.First the abs sensors can and should be removed,inspect the sensor mounting surface for rust (clean w/ sandpaper) insp the sensor (note the sensor may break w/ trying to remove so be gentlel) if all looks ok reassemble and test drive. if unwanted abs still persists both hub bearings should be replaced (call your dealer and ask if a special policy exsits for this condition) usually no abs code w/ be present Good luck Ray..
I'm no guru on ABS, but I don't know that a code will be displayed for a wheel bearing. Usually those sensors are related to the ABS system. I'd get a second opinion on the wheel bearing before paying to have that repair done. I'm not familliar with carx, but I'd be careful they aren't simply resetting a control and charging you for a wheel bearing.
You may just have a bad sensor.i have a 99 gmc same problem.took it to the dealer and they replaced sensor per recall.no charge.recall may not have hit your year yet.i pulled the fuse in mine until it was fixed,it was bothering me.
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When the ABS comes into play from heavy braking you will feel a pulsating of the brake pedal under your foot. This is the brake pressure, on off on off as the wheels stop start stop etc. The ABS will not control the vehicle direction but by allowing the wheels to turn under brakes and not lock up you have control of the steering and the direction the vehicle goes.The ABS will not stop you quicker and in fact on ice or loose surface the distance to stop will be increased. As I said all the ABS does is give you steering ability under brakes.. Take the vehicle to an accredited brake shop and have the ABS tested if you feel that it is no operating properly
pulsates ARE normal for this truck it means abs is working.
if truck pulls to the right then the LEFT brake caliber is not working right check to see if rusted up... also install NEW calb. BOLTS never reuse old one if one is bent calb. wont slide correctly
Try pulling the fuse for the anti-lock braking system. If the problem goes away with the ABS disabled, check the wheel rotation sensors for problems, especially cracked or broken mounts or wiring issues. I'm thinking a sensor is dropping out when it gets heated by the brake and feeding bad data to the controller. The controller than treats it as a low traction situation and starts pulsing the brakes. If this is the case, you would see an ABS or Low Traction warning light on your dash.
Another possibility is a worn or loose suspension component oscillating under braking stress. In particular, check the shock absorber mounts. You could also have a pad that chatters instead of gripping the rotor cleanly - this may leave marks on the rotor, and would probably produce an audible noise.
If you can feel the pedal pulsating and the light turns on the Abs is doin its job. if you want a better stop you could try a brake pad upgrade to ceramic pads and for even more stoping power add an after market drilled and sloted rotors.
depends if it just a rear abs or all four abs system. check the rear end on top of the diff there will be a wires coming off it. then the fronts you have to remove the wheels and follow the wire that goes to back of the rotors, and speeking of rotors, get your rotors machined if there is room or just replace them. there warped if your feeling the brake pedal pulsate or the car
That is just the ABS system at work. It is supposed to prevent your wheels from locking which often makes the brake pulsate, especially in wet weather or or snow or ice. The only way to really stop this is to disable to ABS by unplugging it and removing the fuse. This will make the ABS light appear in your dash, but your brakes will stop pulsating.