BMW E30 Installation Front To begin, remove the lug bolts and front rim from the vehicle. On the backside of the caliper remove the two bolts holding the brake to the hub. Pull the caliper off the rotor and position it out of the way ensuring that it is not hanging from the brake line. Locate the speed sensor attached to the rear of the hub and remove the mounting allen bolt. Once the bolt is removed, twist and pull the sensor to detach it from the hub. This speed sensor will
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