BR–91 BRAKE SYSTEM – ANTI–LOCK BRAKE SYSTEM (ABS) 3 Check sensor rotor and sensor installation. Front Front P Remove front speed sensor rotor (See page SA–15). C Check sensor rotor serrations. OK No scratches or missing teeth. C Check the front speed sensor installation. OK The installation bolt is tightened properly. Rear Rear P Remove the drive shaft (See page BR–45). C Check sensor rotor serrations. OK No scratches or missing teeth. C Check the rear speed sensor installation. OK The installation bolt is tightened properly and there is no clearance between the sensor and rear axle carrier. OK NG BR3719 BR3720 BR3795 OK NG Replace speed sensor or rotor. NOTICE: Check the speed sensor signal last (See page BR–62). Check and replace ABS (& TRAC) ECU.