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actually high chance its the brake booster, that is the kind of sound a worn booster would make,
you should be able to hear the noise when you are close to either the ABS pump or the Booster,
 

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thats the strangest sound i ever heard from the brakes,
whats your thoughts on bleeding the brakes again, including bleeding the ABS
 

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i did look but didn't find what your asking for, i was hoping there was going to be some valve or something but no nothing just a simple straight forward setup,

brake resovoir, ABS pump, hard brake lines, flexible brake lines, calipers,
and just as i'm typing this, my last possible cause collapsed rubber hose inside the flexible brake line,
 

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Thanks for all the good info!
I've done a lot of brake jobs successfully over the years but I have never dealt with troubleshooting an ABS system.
I was thinking there may be a proportioning valve problem going on here and I'm assuming the Anti-Lock Brakes Module does the job of the proportioning valve.

It is defiantly not the parking brakes, I checked that thoroughly. Good thought though.
I hear the creak at the front wheels although sometimes I hear the noise at all 4 wheels.
I can make brakes creak in any car by slowly releasing pressure off of the brake pedal and letting the car inch forward or backward while maintaining light pedal pressure.
To me, that is expected, normal behavior.
That is the same sort of creak sound I hear on my Nitro when I quickly and completely release the pedal as one normally would under normal conditions.
Do you think it is possible that a faulty ABS Module or control unit could cause the caliper piston to not release the pads fully or quickly enough when releasing the brake pedal?
maybe the ABS is not faulty but could have air trapped, to bleed the ABS unit you need an advanced Scantool, do you think you allowed air into the system when you changed the calipers ?,​
 
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