Tire-related:
* Dry Rot/Cracked Tires: If the tires are old and dry, the rubber can squeak, especially during turns. Inspect your tires for cracks or excessive wear.
* Low Tire Pressure: Under-inflated tires can cause squeaking, especially on turns. Check your tire pressure with a gauge and inflate to the recommended pressure (found on a sticker inside your driver's side doorjamb or in your owner's manual).
* Worn Tire Tread: While not always squeaking, severely worn tires can create unusual noises. Check the tread depth.
* Foreign Objects: A small stone or piece of debris lodged in the tire tread can cause a squeak. Check the treads carefully.
* Brake Dust Buildup: Excessive brake dust can sometimes create a squeaking sound when the brakes are not engaged.
Brake-related (most likely if the sound is coming from behind the driving wheels):
* Worn Brake Pads: This is a very common cause of squeaking. Worn pads scrape against the rotors, creating a high-pitched squeal. This is a safety issue and needs immediate attention.
* Brake Caliper Issues: A sticky or seized brake caliper can cause squeaking.
* Brake Pad Shims: These metal plates are part of the brake pad assembly and are designed to reduce noise. If they are worn or missing, it can lead to squeaking.
* Rotor Issues: Warped or damaged rotors can also squeak.
Suspension-related:
* Worn Bushings: Bushings in the suspension system can wear down and squeak, especially during turns or over bumps.
* Worn Shocks or Struts: While less likely to cause a constant squeak, worn shocks or struts can contribute to noises under certain conditions.
Other possibilities:
* Belt Issues (less likely): Although less probable for a squeak directly behind the wheels, a worn serpentine belt could sometimes make a high-pitched squeal, but it's usually more noticeable at idle or higher RPMs.
What to do:
1. Isolate the sound: Try to pinpoint the exact location of the squeak – is it consistent while turning, braking, accelerating, or just when driving straight? This will help narrow down the possibilities.
2. Inspect your tires: Check the tire pressure, tread depth, and look for any embedded objects or signs of damage.
3. Check your brakes: Examine the brake pads for wear. You might need to visually inspect the rotors (be careful – they're hot when you've been driving).
4. Consult a mechanic: If you can't identify the problem, or if it's brake-related, it's best to take your Tahoe to a qualified mechanic for a proper diagnosis and repair. Ignoring brake issues can be dangerous.
Don't delay addressing a persistent squeak, especially if it seems related to the brakes. Ignoring it could lead to more serious (and expensive) problems down the road, or even a safety hazard.
