Mazda Repair Questions? Ask Mechanics for Answers ASAP
Hello, my name is***** are a few things that can cause this on the MX-5, but most of the time it is caused by a bad brake pedal sensor. When this sensor fails the computer cannot detect the brakes being applied so instead of it turning off the cruise the vehicle tries to speed up to counteract the speed change. This can be tested or simply replaced. I hope this helps. Please let me know if you need more help.