The brake caliper is the most important component in the modern disc brake systems which are functioning together with the brake pads and rotors. The brake fluid pressure is pushing through the master cylinder to the caliper for moving the piston and creates a force to the brake pads against the rotors. Eventually, you will notice that the brake caliper lost its performance due to the heat caused by the friction. Go through the following video to know about the symptoms of bad brake caliper in BMW X1.
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