That said, here are some potential causes and *very basic* troubleshooting steps (proceed with extreme caution and at your own risk):
Possible Causes:
* Power Booster Issues: This is the most likely culprit. A faulty power booster can make the brakes feel very sensitive and require minimal pedal pressure. It might be leaking, malfunctioning internally, or have a vacuum leak in the system. This requires professional diagnosis and repair.
* Master Cylinder Problems: A failing master cylinder can also cause overly sensitive brakes, or inconsistent braking. It may be leaking internally or externally. Again, this requires professional attention.
* Brake Proportioning Valve: This valve balances brake pressure between the front and rear wheels. If it's malfunctioning or sticking, it can lead to an imbalance and a feeling of overly sensitive brakes. Adjusting this is usually not recommended for a home mechanic.
* Brake Lines/Hoses: Leaking or restricted brake lines or hoses can cause inconsistent brake pressure and a sensitive feel. Inspect them carefully for any signs of damage, leaks, or swelling.
* Improper Adjustment (Less Likely): While less common with power brakes, slightly adjusting the rear brake shoes (drum brakes) *could* make a marginal difference. However, this should only be done if you are experienced with this type of brake system, and it's unlikely to solve the core problem. Improper adjustment can easily lead to unequal braking and increased stopping distance.
* Fluid Contamination: Dirty brake fluid can affect performance. However, contaminated fluid would likely manifest in more noticeable ways (spongy pedal, etc.) than just increased sensitivity. Flushing the fluid is always a good idea if it's old, but it's unlikely to solve the sensitivity issue on its own.
Things NOT to do:
* Don't just adjust the rear brakes: As mentioned, this is a risky procedure that might worsen the problem.
* Don't bleed the brakes unless you know what you're doing: Incorrect bleeding can introduce air into the system and lead to complete brake failure.
What YOU should do:
1. Safety First: If the brakes are overly sensitive and you are uncomfortable driving the car, do not drive it. Have it towed to a mechanic.
2. Visual Inspection: Carefully inspect all brake lines, hoses, and components for any obvious signs of damage or leaks. Look for fluid drips or rust.
3. Professional Help: Given the age of the car and the nature of the problem, the safest course of action is to take it to a trusted mechanic for diagnosis and repair. They have the tools and expertise to properly diagnose the issue (likely the power booster or master cylinder) and repair it safely.
Attempting to fix this yourself without proper knowledge and tools could be dangerous and lead to serious injury or accidents. The cost of professional repair is far less than the cost of an accident caused by faulty brakes.
