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Unplug the harness plug to the ABS module under the hood and see if shuddering stops. You will still have an ABS light on the dash but it should not effect normal braking. If shuddering stops the ABS module is bad, also check for any kinked brake lines resulting from accident. Be careful when working with brakes, no excessive speed and be ready to apply hand brake.
The ABS light on means an ABS malfunction. You should be able to have a auto parts store scan your car and find out what code is tripped, for free, but my guess is that one of your front wheel speed sensors is out of whack, or dirty or something.
When the light is on, your normal brakes work fine, but you have no ABS, so your car will take longer to stop in emergency situations.
Is your ABS light on? If so, you have a bad wheel speed sensor at the LF wheel. Or, you may have rust buildup on the teeth that the speed sensor measures. Pull off the axle, and check the toothed gear that resided in the spindle.
If not, you may havea sticking caliper piston, or inadequate lubrication on the caliper slides.
Its possible that right wheel speed sensor is dropping out early making the truck think that wheel is locking up. That will activate the ABS and let the brake go on the right wheel which will make the vehicle pull slightly left. The only way to know for sure is to watch the wheel speeds on a scanner and see which one is drpping out first and replacing that speed sensor/bearing assembly.