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I got some riding (or is it driving?) to do to catch-up!

Only issue I have is the brake light coming on. Sounds like I’ll need to replace some sensors.
If it is the “brake failure” light on the tach, it could be as simple as low brake fluid level. The sensors on the master cylinder reservoir only close a circuit when they are sitting in a bath of fluid. If fluid is low, they will definitely start intermittently lighting the brake failure on the dash. If fluid level has gone really low, there could be air in the master cylinder triggering the pressure sensors.

The other issue could be the brake pressure sensors. They are located just slightly below on the master cylinder itself. They are simple operation so, easy to test. Unplug both. Use a multimeter to probe each switch. Have someone inside the Slingshot step on the brakes. The pressure sensor should show a short. Release brake should be open.


For the wheel sensors, I believe if they fail in any way it lights the “ESP off” and/or “traction control off” lights. If so, try the following before whipping out the checkbook at the dealer.


  • Follow each sensor cable back to the connector. Unplug, check for any signs of water or corrosion, spray some electric contact cleaner, put a little dielectric grease and re-plug in. Take it for a ride and see if problem is cured.
  • If above didn’t help, it’s time to look at the sensors themselves. They are easily removed. Once out, blow out the inside with some air. Clean the sensor if it is looking cruddy. Re-install and go for a ride. These sensors are only hall-effect magnetic sensors. The signal from all 3 are sent back to the ECU and it just compares all 3 and activates antilock or stability control as needed.
 

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I don't know if anyone has any how-to videos online but, this is a section from the maintenance manual. In my opinion, "Test 1" is a bit over the top as it is very unlikely you would have a physical wire in the harness go bad.
 
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