1. Dry or Worn Brake Shoes/Pads: This is the most common cause. The metal-on-metal contact between the brake shoes/pads and drums/rotors creates a high-pitched squeak.
* Solution: Inspect your rear brake shoes/pads. If they're worn, replace them. If they're still relatively thick but dry, lightly lubricate the contact points with a *brake caliper lubricant* (specifically designed for this purpose – *do not use general-purpose grease*). This lubricant is formulated to withstand high temperatures and not affect braking performance.
2. Worn or Damaged Wheel Bearings: Worn wheel bearings can create a variety of noises, including squeaking, especially under load or when turning.
* Solution: This requires more mechanical skill. You'll need to inspect the wheel bearings. If they're worn or damaged, they need to be replaced. This often involves removing the wheel, hub, and bearing assembly. If you're not comfortable with this, take it to a mechanic.
3. Problems with the Parking Brake: A sticking or poorly adjusted parking brake can squeak.
* Solution: Release the parking brake completely. Inspect the parking brake mechanism for any signs of binding or damage. Adjust the parking brake cables if necessary (consult your owner's manual or a repair guide for your specific year S10 Blazer).
4. Debris in the Brakes: Sometimes, small stones or debris can get lodged in the brake system and cause squeaking.
* Solution: Thoroughly clean the brake components, removing any debris. This may require removing the wheels and using a brush and compressed air.
5. Suspension Components: While less likely to cause a tire-specific squeak, worn suspension bushings or other components *could* contribute to noises that seem to originate from the tire area.
* Solution: Inspect your suspension bushings, shocks, and other components for wear and tear. Replacement may be necessary.
Troubleshooting Steps:
1. Isolate the squeak: Try to pinpoint the exact location of the squeak. Does it happen only when braking? Only when turning? Only at certain speeds? This will help narrow down the possibilities.
2. Visual Inspection: Carefully inspect your rear brakes, wheel bearings, and suspension components. Look for wear, damage, or debris.
3. Test the Brakes: Test your brakes gently. If the squeak is only present when braking, the problem is likely with the brakes themselves.
4. Professional Help: If you're not comfortable performing these checks or repairs yourself, take your S10 Blazer to a qualified mechanic.
Important Note: Never use WD-40 or other general-purpose lubricants on your brakes. These can damage brake components and reduce braking effectiveness. Always use a brake caliper lubricant designed for this purpose.
