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What may cause brake fluid to leak at master cylinder on a 1991CADILLAC deville?

1. Damaged Brake Lines: Inspect the brake lines for any signs of damage, such as cracks, corrosion, or holes. If any of the brake lines are damaged, they will need to be replaced to prevent further leaks.

2. Rusty Brake Pipes: Rust can cause brake pipes to become weak and brittle, leading to leaks. Check for any rust on the brake pipes and replace any that are severely corroded.

3. Loose Fittings: Brake fluid can also leak if the fittings that connect the brake lines to the master cylinder are loose. Tighten any loose fittings to stop the leak.

4. Worn Brake Master Cylinder Seals: The seals in the brake master cylinder can wear out over time, causing brake fluid to leak. If the seals are worn, the master cylinder will need to be rebuilt or replaced.

5. Defective Brake Master Cylinder: In some cases, the brake master cylinder itself can become defective and cause a leak. If the master cylinder is defective, it will need to be replaced.

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