How to test your calipers:
1. Unbolt the 2 slider pin bolts on the back of the brakes.
2. Pull calipers off and rest them upside down on top of the rotor.
3. Have a friend slowly start pumping the brake petal.
4. Watch the pistions as they go out/in, one maybe slower than the other which is normal. If you notice one of your pistions is moving very little or not at all, then you have a sticky/frozen pistion.
One of my dust cover boots was torn and dust/dirt got in causing the pistion to freeze.
Keep in mind, there could be several reasons for braking vibrations. Such as:
1. Glazed/warp rotors - needs to be turned or replaced
2. Uneven pads - Check the slider pins, relube.
3. Worn/torn LCA bushings - replace
4. Rear brakes will also cause the same issue, so make sure to check them too.
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