Here's a breakdown of the likely culprits:
* Brake Pads/Calipers: This is the most common cause. Worn or glazed brake pads can squeak, especially when the pads are partially contacting the rotor. Similarly, a sticky or seized brake caliper piston can cause constant friction and squeaking. The squeaking when turning suggests uneven pad wear or a sticking caliper.
* Wheel Bearings: While less likely to squeak only during those specific maneuvers, worn wheel bearings can make noise under load, which could be exacerbated during braking, acceleration, and turning. A failing bearing will often exhibit a rumbling or growling noise, but squeaking is possible, especially in the later stages of wear.
* Suspension Components: A worn or damaged suspension bushing or ball joint could be contributing to the noise, especially when the suspension is under stress from turning, braking, or accelerating. This is less likely to be the *primary* source of the squeak but could be exacerbating it.
* Steering Components: While less probable, a worn tie rod end or other steering component could contribute, especially when turning.
* Rotor or Drum: While less frequent, a warped or damaged brake rotor (disc brake) or drum (drum brake) can sometimes make a squeaking noise, especially when under pressure from braking.
Troubleshooting Steps:
1. Visual Inspection: Carefully inspect the front left wheel and brake assembly. Look for:
* Worn or glazed brake pads.
* Rust or debris on the brake rotor or drum.
* Damage to the brake caliper.
* Leaks in brake fluid lines.
* Loose or damaged suspension components.
2. Brake Caliper Inspection: Try to manually move the brake caliper piston. It should move smoothly. Sticking or binding indicates a problem.
3. Test Drive and Listen Carefully: Pay close attention to *when* the squeak occurs to better isolate the problem. Does it squeak constantly while turning, or only when braking while turning?
4. Professional Inspection: If you are not comfortable inspecting the brakes yourself, take your vehicle to a qualified mechanic. Brake systems are critical for safety, and improper diagnosis or repair can be dangerous.
It's crucial to address this issue promptly. Ignoring brake-related squeaking can lead to further damage, reduced braking performance, and potential safety hazards.
