Electrical Circuit
- Turn ignition switch to START position and release to ON position. Red brake warning light should come on in START position and go off in ON position (bulb check). If Red brake warning light stays on after 2-3 second bulb check, ensure parking brake is fully released and there are no leaks in hydraulic brake system. If Red brake warning light does not come on, go to next step. If Red brake warning light goes out after 2-3 second bulb check, warning light is operating properly.
- Disconnect parking brake switch connector (Gray/Black wire). Turn ignition switch to START position and release to ON position. Red brake warning light should come on in START position and go off in ON position. If warning light does not come on and go off as specified, check parking brake switch circuit for a short to ground. If parking brake circuit is okay, go to next step.
- Locate brake warning light switch 2-pin connector on combination valve. Release lock taps and disconnect brake warning light 2-pin connector. Connect a jumper wire between connector terminals. Turn ignition switch to START position. Brake warning light should come on. Remove jumper wire and brake warning light should go off. If brake warning light does not go on and off as specified, bulb or wiring circuit is defective. Replace bulb or repair wiring as necessary. If brake warning light goes on and off as specified, replace brake warning light switch.