* Parking brake engaged: This is the most obvious reason. Make sure the parking brake is fully released.
* Rear brake system issues: This is the most likely culprit if the parking brake is disengaged. Possibilities include:
* Frozen or seized rear calipers: Calipers can seize due to corrosion, sticking pistons, or low-quality brake fluid. This would cause constant clamping of the brake pads on the rotors.
* Leaking rear wheel cylinders (drum brakes): If the Camaro has rear drum brakes, a leaking wheel cylinder can cause the brakes to drag or lock up.
* Proportioning valve issues: This valve regulates the braking force between front and rear brakes. A malfunctioning proportioning valve can send too much braking force to the rear wheels. This is more common on vehicles with rear drum brakes, which are usually found on this vintage of Camaro.
* Low brake fluid: While it would affect all brakes, low fluid could lead to uneven pressure distribution.
* Contaminated brake fluid: Dirty or moisture-laden brake fluid can compromise brake performance and lead to uneven braking or locking.
* Malfunctioning master cylinder: A master cylinder fault could disproportionately affect the rear brakes.
* Rear brake lines or hoses: A kinked, restricted, or damaged line could partially or fully restrict brake fluid flow to the rear wheels, leading to an uneven braking force or lockup.
* Drivetrain issues (less likely): While less probable, a severely binding rear differential or driveshaft could create enough resistance to mimic locked rear wheels. This would usually be accompanied by other symptoms, such as noise or difficulty shifting.
* Incorrect adjustment of the rear brakes (drum brakes): If the rear brakes are drum brakes, incorrect adjustment of the brake shoes could lead to excessive braking force and wheel lockup.
Troubleshooting Steps:
1. Check the parking brake: The easiest first step!
2. Inspect the brake system: Look for leaks, visibly seized calipers, or other obvious problems.
3. Check brake fluid level: Ensure it's within the appropriate range.
4. Test brake pedal feel: A spongy or unusually firm pedal could indicate problems in the braking system.
5. Listen for unusual noises: Grinding or squealing from the rear wheels could point towards a specific brake component problem.
6. Test for wheel drag: If possible, carefully try to rotate each rear wheel by hand. If it's difficult to turn, you've found the problem area.
Important: If you suspect a problem with your braking system, do not drive the car. Have it checked by a qualified mechanic as soon as possible. Locked wheels can lead to loss of control and accidents.
