This video shows how to replace the brake interlock switch on a riding lawn mower. When working correctly, this safety switch keeps the engine from starting if your foot isn’t pressing down on the brake or if the parking brake isn’t set. If the brake interlock switch breaks, it won’t let current reach the starter solenoid coil even though the brake is on, so the engine won’t start. If the solenoid doesn’t click when you turn the ignition key, the brake interlock switch is most likely at fault. If the brake interlock switch is at fault, replace it with a part that fits your model.
Visit us at:
Or call 1-800-437-1673 to speak with a parts specialist.
The video includes these parts and tools. Look up your model to make sure you get the right parts for your mower.
Brake interlock switch
Find riding mower parts at
Or click here to schedule an appointment with a repair technician.
The first step to replacing the brake interlock switch is to turn the ignition switch off and remove the key. Lift the seat. Remove the bolt connecting the negative cable to the battery and tuck the battery cable away so it doesn’t touch the battery post. Lower the mower deck to its lowest position. Remove the left rear steering plate mounting bolt. Remove the left front steering plate mounting bolt and the upstop bracket. Lift the hood. Remove the lower dash fastener and pull off the lower dash. Remove the fuel tank and rest it on top of the engine if you need more room. Remove the wire harness from the brake interlock switch. Hold the brake pedal down to lower the steering plate while you squeeze the brake interlock switch mounting tabs and push the switch down to release it from the mower frame. Hold the brake pedal down while you snap the new brake interlock switch onto the mower frame. Connect the wire harness to the new brake interlock switch. Reinstall the lower dash and secure it with the fastener. Lower the hood. Position the upstop bracket on the frame and reinstall the left front mounting bolt in the steering plate. Reinstall the left rear mounting bolt in the steering plate. Set the parking brake. Reconnect the negative cable to the negative battery terminal. Lower the seat.