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Re: Brake light on dash and AC making a hissing sound
Thumbs-up for posting in the correct section!
The brake light is due to low brake fluid. When it warms it expands just enough to make the sensor happy. The fluid is almost certainly low due to brake pad wear, the caliper pistons sit further "out" of the cylinders and more fluid stays down in the cylinders instead of the reservoir. Check the pads for wear, add just enough FRESH fluid to keep the reservoir sensor happy, and only top off the fluid after the pads have been replaced or you could end up with a mess under the hood if the pad replacement isn't done without opening the bleeder screws to push out the old fluid. A proper job on a modern ABS-equipped vehicle should not push the fluid back up the line, but most shops don't bother.
As for the A/C, look for an oily leak somewhere to start with.
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When did you last check your spare tire's pressure?
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