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Could be caused by a sticking/failing CV joint. If you check boots and see cracks or tears most likely the Joint then got debris which could lead to failure. Confirm that it FEELS like brakes are active but your NOT applying brakes. If this is the case then my thought on CV joint would be first check. I had one fail a few years ago and it was similar. Vibration started and then I could feel the vehicle slowing.
If you ARE applying brakes and you fee the shudder or vibration then it may be related to a tie rod end. A worn tie rod allows the wheel to go off track slightly and the result we feel when driving is a shudder or vibration.
My 2 have always made that noise, I'm guessing it has something to do with the ABS charging in preparation for potential use. after a combined total of 240k miles, there has been no noted detrimental effect to this "charging" sound.
Great car.
Theres a problem with a speed sensor at the wheels, there are four abs sensors one on each wheel and they read the wheel speed of each wheel, what is happening is that when you step on the brake the computer is reading the speeds of each wheel and sees one wheel is moving slower than the other and thinks that whell is skidding so intern its release the braks very very fast and thats the vibration you are feeling but the wheel is not skiding theres a problem with a sensor thats giving a flase reading, a scan tool will be needed to be conected to the compuetr and truck driven to see which sensor is bad or acting up, hope this is helpful. some times it can be dangerous if it keeps releasing the brakes while you are trying to stop.have this checked out.
The rotors are warped, need to replace them, also when the wheeles are put back on, the lug nuts need to be tourqued down to the specifications for that car, or the new rotors will warp again.
Joe it is common for the brakes to moan when they wear down and sometimes they will squeak, try replacing the front pads and lubing the shafts on the calipers install anti squeal on the back of the pads, the ABS device would not cause noise as they are just a ring with a magnet and the reluctor ring spins and the magnet detects the spinning of the reluctor ring, they don't even touch and are stationary in place where they are mounted. There is a possibility that the brake fluid is dirty and could cause the abs motor to groan but you would just have to flush the system, When you don't put your foot in it on the brakes it will make some noise even new, I have a 2008 ford ranger that makes the same noise and the brakes are fine. You will have to adjust your braking habits to stop the noise. You can change the pads and that will help but not for long, be sure when you are operating your brakes press firmly on the pedal until you stop. If the brakes make noise after you let up on the pedal then the caliper parts need to be cleaned and lubed, however it is not a safety issue.
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