Wheel speed sensors are often called ABS sensors. You'll find them mounted on the axles of all ABS equipped vehicles on your wheel hubs, near the brake rotors. The ABS sensor is a vital part of the braking system. Without a working ABS wheel speed sensor, the ABS system will fail to work properly. Resulting in a ABS Light on your Dash and loss of your Antilock Brake System. Fit 02-06 Cadillac Escalade/02-06 Chevrolet Avalanche 1500/03-13 Chevrolet Express 1500/03-05 Chevrolet Express 2500/99-05 Chevrolet Silverado 1500/07 Chevrolet Silverado 1500 Classic/00-06 Chevrolet Suburban 1500 /00-06 Chevrolet Tahoe/03-13 GMC Savana 1500/03-05 GMC Savana 2500/09-16 GMC Savana 4500/99-05 GMC Sierra 1500/07 GMC Sierra 1500 Classic /00-06 GMC Yukon/00-06 GMC Yukon Xl 1500