To use this brake caliper spacer shim, first make sure you have a 12mm wide brake disc and either a 1375B or 181375 brake caliper. Do not try to use it with the MCP 1384 - SE Single Line Internal Crossover Style Brake Caliper. The spacer is 0.300 inches thick, so install it carefully to ensure proper fit. Remember, the brake caliper is sold separately, so you'll need to get that on your own. For maintenance, keep the spacer clean and check it regularly for any signs of wear or damage. If you notice any issues, replace it promptly to keep your braking system working well.