Remove the wiring harness connector from the brake fluid reservoir level switch connected to the side of the reservoir before servicing the sensor. Then, with a screwdriver, loosen the retaining tabs on the other end of the brake fluid level switch, found on the right part of the reservoir. Under compression of the tabs at the top, pick up the connector part of the brake fluid level switch and remove it from its holder. When installing, put the brake fluid level switch into the left side of the brake fluid reservoir and push it down until the tabs hold it in place. After that, attach the vehicle wiring harness connector to the brake fluid level switch.