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The Chevrolet/GM autos rely on a Kelsey ABS actuator system that is electronically controlled. I know its hard to describe sounds, but is it possible the crunch is a hum? If the ABS light comes on and goes off after restart it means one of two things. That the ABS controller is going bad or the speed sensors on the wheels have come loose or gone bad. Under your hood there is a fuse compartment that contains the fuse that controls the ABS system on your vehicle. Its a 60 Amp fuse and large.. Look in your owners manual for its location. . Check it with the vehicle OFF to make sure its not blown or cracked. Leave the fuse disconnected and start the car. The ABS light should STAY on as well as the parking brake light. Test your brakes by pressing down on them while the car is in park and not moving.. do you hear the sound. If you DONT hear the sound then the ABS control module is causing the brake pump to work continuously and thus your "noise". YOu can confirm by placing the fuse back in place and then listening to the car about where the drivers door is... do you hear a hum? If so you can leave the fuse disconnected to deactivate the ABS module. The brakes will still function you just WONT have ABS capability. Confirm this with a very slow roll from park or neutral and press brakes to stop. If you dont hear the noise or a hum, reconnect the fuse and take the car for a drive. Turn to the left and right while applying the brake at an intersection.. vehicle in motion slightly. Do you notice that the ABS light or noise occurs turning one way or the other or both? If it comes on during the turn then the ABS sensor in that wheel or both wheels need to be inspected and possibly replaced. Finally, you need to inspect the brake pads for wear..typically however brake pads have WEAR INDICATORS built in and will start to SQUEAL when you apply the brakes telling you time to replace pads. If its a squeal and not a crunch then have pads replaced. Finally, be sure and make sure you dont have any rocks or road debris within the brake area or between teh pads and the rotors. That would be your final area to review for a CRUNCH 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.
Abs light on means the ABS sytem has a fault.
You can determine what is wrong by counting the flashes (they say) and then put the data in on the web.
IE abs, windstar, failure, 3 flashes.
The brake light on is most likely picking up on uneven brake pressure, or a failing master cylinder/
You may not feel any difference yet, give it a little time, feel for a pedal fade at a light.
There is an ABS sensor on each wheel. Check each one and make sure they are plugged in first. If they all are plugged in, then you may need to replace one or more of them. You can usually see if they are bad. Hope this helps.
You need to check the brakes for worn pads, pads have a small piece of steel that will screech big time warning you that the pads need replace ment. but the fact that the ABS light is on may mean more is wrong with the brakes. If only the ABS light is on. It can still be driven to a shop.But if both the ABS and the Brake Warning lights are on, the car shouldn't be driven. Take the car to a shop to get the breaks repaired . If only the screeching noise was occuring, then you could replace the pads yourself. but the ABS light means that the brakes have some wrong other than just the pads.
need to get the truck on jack stands remove the wheels and if the truck has drums you maybe able to use some PB blast because the brake cables are rusted for the emergency brakes and at the same time you can check out the condition of your shoes or pads if you get any oil on the shoes or pads use brake cleaner to clean them off
(1) I would suggest someone scan the ABS system for codes. I Have an '03 silverado 2500HD Crew cab, and it needs an EBCM (Electronic Brake Control Module) "ABS module". "Service Brake System" message on dash, ABS and Brake warning lamps lit as well. May be the R/F ABS wheel speed sensor, but what you described happen, shouldn't have caused damage to it. (2) If the aftermarket rim and tire combo are larger than stock (larger overall diameter), then this may affect the way your PCM functions. You can reprogram the PCM to recognize larger diameter running gear so trans shift points and the speedometer and such can function properly. I hope this helps.
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