Wondering if someone can help me eliminate potential issues.
- Squealing, somewhat screechy, somewhat chirpy noise.
- No sound at all while parked, even reving up to 4,000 RPM.
- Sound starts while moving (any speed), by hitting the brakes.
- Reminds me of the sound 18-wheelers make in New York City in stop-and-go traffic.
- Sound persists even after completely letting go of brakes, though softer.
- The higher-pitched "chirps" sync with the speed of the wheels.
- Pitch very closely coupled with brake pressure: I can practically play a tune with my foot.
- Tried driving 15mph on empty road, killed ignition, letting car roll, hit brakes. Sound is there.
- I feel like I distinctly hear it on my side, but I don't have a passenger to help me listen from the other side. I hear it very loud on the highway when in the fast lane next to concrete dividers.
The serpentine belts would make a sound even while idling, no? Would brakepads make noise even while brakes are disengaged?
Car is a 2002 Toyota 4Runner. I just completed a trip across the U.S. My roommate's a hobby mechanic, so he did the following work a few days before my trip:
- Oil change and oil filter.
- Replaced all 3 serpentine belts.
- Checked and filled tire pressure.
- Changed air filter.
- Changed fuel filter.
- Topped off coolant.
- Topped off washer fluid and replaced wipers.
- Topped off brake fluid.
He also did the following within a few months of the trip:
- Changed spark plugs.
- New battery.
- New tires, alignment.
- Transmission fluid and filter.
- Differential fluid.