Brake System Issues:
* Frozen Caliper: This is the most likely culprit. The caliper piston can seize due to rust, corrosion, or a build-up of debris, preventing it from retracting properly. This constantly applies the brakes, leading to a locked wheel.
* Stuck Parking Brake Cable: A cable that's jammed or rusted can keep the parking brake partially engaged, even when the parking brake lever is released.
* Damaged Brake Hose: A restricted or internally damaged brake hose can prevent proper fluid return to the brake master cylinder, leading to a build-up of pressure and a locked wheel.
* Low Brake Fluid: While less likely to cause *only* one wheel to lock, extremely low fluid levels can lead to inconsistent brake pressure distribution.
* Master Cylinder Issues: A failing master cylinder could distribute brake pressure unevenly, although this is less likely to affect only one wheel.
Wheel Issues:
* Wheel Bearing Seizure: While less common, a severely seized wheel bearing could create enough friction to mimic a locked brake. You'd likely notice other symptoms like noise or difficulty turning the wheel.
Other Possibilities (less likely):
* Electrical Fault (ABS): If your Cutlass has anti-lock brakes (ABS), a malfunction in the ABS system could theoretically cause a single wheel to lock up, but this is less probable than mechanical issues.
Troubleshooting Steps:
1. Check the Parking Brake: Ensure the parking brake is fully released. If the wheel still locks, the cable might be the problem.
2. Inspect the Brake Caliper: Visually inspect the rear driver's side caliper for signs of rust, corrosion, or sticking. Try to manually move the caliper piston; it should move freely.
3. Check the Brake Hose: Inspect the brake hose for any kinks, bulges, or damage. Squeeze the hose to check for flexibility.
4. Check Brake Fluid Level: Make sure the brake fluid level in the master cylinder reservoir is sufficient.
5. Listen for Grinding/Scraping: While the wheel is locked, attempt to rotate it by hand. Grinding or scraping noises would suggest a problem with the wheel bearing or caliper.
Important Note: Driving with a locked brake is dangerous. If you suspect a problem, avoid driving the vehicle until the issue is resolved. It's best to have a qualified mechanic diagnose and repair the problem to ensure your safety.
