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have code retrieved most auto stores offer this service for free ---check hub /wheel bearing grinding good possibility its shot hub has abs sensor built into it which can be part of traction control issue -c/v axle can also give grinding issue ----as well as check brakes may need brake replacement --stuck/damaged caliper - a brake pad damaged/stuck against rotor
id check your caliper to see if the piston is compressing all the way if not check your fluid it should be clean not brown or if you have been through large amounts of water if it has gotten into the brake system and check your bleeder valve to check if it has rotted or come lose or if you have a break in the lines or air, most likely your caliper is failing to compress.
Sounds like you have a speed sensor signal dropping out. This would cause the ABS system to falsely think one of the wheels has locked up and would turn on the abs to unlock the wheel.
You can visually check the wiring harnesses to the speed sensors to see if there are any corroded connections, corroded wires or broken wires. If everything looks good than the next step would be to drive it with a scan tool and watch ABS data. You should be able to spot the speed sensors that drops out on the scan tool when the problem occurs. Than you can focus on that wheel to see what the problem is.
Have a competent mechanic scan the codes in the ABS control. A common fail point of the 2005 Equinox is the wire harness jumper for the drivers front wheel sensor. This is a foot and a half long jumper that connects the wheel sensor to the engine compartment wire harness. It is rigidly held in place by a couple of plastic stays that create a pinch flex point just beneath the lower stay where wheel turn moves the wire against this rigid point. After about 60-80k miles, the wire begins to break down in the insulator and false wheel speed readings are read as false wheel slip indications while the ABS system tries to modulate brake pressure. This modlation creates the grinding feel. After an amount of time, the ABS computer "recognizes" this as a fault and shuts ABS and traction control off since both systems use the wheel spin input, and the dash lights light. Although this is a pretty pricey part at a dealer, a genuine Delco replacement part can be found online often at a much more reasonable price.
Because the brakes were changed, either one of the sensors were broken when removing brakes or it has set a code. Go to your local autoparts store and have them reset the code. See if it comes back on. If it does you will need to look at the ABS sensors on each wheel and replace if damaged