However, if you're experienced and understand the risks, here's a general overview. This is NOT a complete, step-by-step guide, and specific procedures may vary depending on the year and model of your E350. Always consult a repair manual specific to your vehicle's year and model.
1. Safety First:
* Disconnect the battery's negative terminal. This prevents accidental shorts and electrical hazards.
* Gather your tools: You'll need wrenches (various sizes), flare nut wrenches (to avoid rounding off brake line nuts), a tubing cutter, a double flare tool (or a single flare tool if that's your preferred method), a brake line bender, new brake line (the correct diameter and length – measure carefully!), new fittings, a helper (highly recommended), brake fluid, and safety glasses/gloves.
* Raise and support the vehicle securely: Use jack stands, never rely solely on a jack. Choose a level, stable surface.
* Locate the damaged brake line: Carefully inspect the entire braking system to identify the extent of the damage and plan your replacement accordingly.
2. Line Replacement Procedure (General Steps):
* Bleed the brakes: Before disconnecting any lines, bleed the brake system to remove pressure.
* Disconnect the damaged brake line: Carefully loosen and remove the fittings at both ends of the damaged section. Have a container ready to catch any residual brake fluid.
* Remove the damaged section: Carefully remove the damaged section of brake line. Be mindful of surrounding components.
* Measure and cut the new brake line: Measure the required length of the new brake line, accounting for bends and fittings. Use a tubing cutter for a clean, square cut.
* Flare the new brake line: Use the double flaring tool to create a proper flare on both ends of the new line. A clean, properly formed flare is crucial for a leak-free connection.
* Bend the new brake line: Carefully bend the new brake line to match the original routing. Avoid sharp bends, which can restrict flow and weaken the line. Use a brake line bender to ensure consistent and proper bends.
* Install the new brake line: Connect the new brake line to the fittings, ensuring a snug and secure fit. Tighten fittings to the manufacturer's specified torque.
* Reconnect all components: Reassemble any components that were removed during the process.
* Bleed the brakes: After reconnecting everything, thoroughly bleed the brakes to remove any air introduced during the repair. This is absolutely critical for proper brake function. Use a pressure bleeder for the most effective bleeding.
* Test the brakes: After bleeding, carefully test the brakes several times, checking for leaks.
3. Post-Repair:
* Lower the vehicle: Carefully lower the vehicle from the jack stands.
* Inspect for leaks: Carefully check all connections for leaks.
* Test drive: Take the vehicle for a short test drive, ensuring the brakes function properly and there are no leaks.
Important Considerations:
* Brake fluid is corrosive: Wear appropriate safety glasses and gloves.
* Proper flaring is crucial: An improperly flared brake line will leak.
* Correct routing is essential: Incorrect routing can lead to line damage or failure.
* Bleeding is critical: Air in the brake lines will severely impair braking performance.
* Professional help is recommended: If you are not comfortable performing this repair, have it done by a qualified mechanic. Your safety is paramount.
This is a simplified overview. Again, refer to a repair manual specific to your vehicle's year and model for detailed instructions and diagrams. Incorrectly repairing your brakes can lead to serious injury or death. If you have any doubts, seek professional assistance.
