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If you spray WD40 on the hot disc and caliper you risk starting a fire. Using WD40, silicone spray, or another liquid on the hot parts you risk warping the rotor and cracking the caliper from sudden cooling. If you spray WD40 on the hot disc and caliper you risk starting a fire. Using WD40, silicone spray, or another liquid on the hot parts you risk warping the rotor and cracking the caliper from sudden cooling. WD-40 doesn't belong anywhere near any braking components at any time for any reason.