I have a high pitch noise, but it stops when I apply brake.

Asked by Nov 14, 2016 at 10:38 PM about the 2001 Toyota Tacoma 4 Dr Prerunner Crew Cab SB

Question type: Maintenance & Repair

The noise comes from the engine area. I start the truck up. the noise starts.
It sounds like an electrical problem. I pulled all the fuses while the truck was
turned on. No thing happened.If i apply the brake while in park or while
driving the noise goes away. If I turn the truck off, the noise goes away but it
takes about 1-2 mins. Almost as if it was caused by pressure.
HELP!!!

1 Answer

105,265

Could it be vacuum? Have you checked the vacuum lines, you referenced the brakes, so the first line to check would be the main booster supply line and check valve.

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