Brake Line - Single

Replace a single damaged or corroded brake line section on a 1992 Dodge Viper, including line removal, installation, flaring (if fabricating line), and brake system bleeding.

Warnings

Tools required

Parts

• Brake line (pre-bent OEM or fabricated from 3/16" steel brake tubing) × 1 — Use OEM specification or NICOPP nickel-copper brake line
• Brake line clips/brackets (if damaged) × 1 — Use OEM specification
• Brake line fittings (if fabricating) × 2 — 3/16" double-flare fittings, M10x1.0 or 3/8"-24 depending on location

Fluids

• DOT 3 brake fluid — 1 qt

Preparation

1. Park vehicle on level, solid surface. Apply parking brake and place transmission in first gear.
2. Chock rear wheels securely if working on front brake lines, or front wheels if working on rear lines.
3. Locate the damaged brake line section and identify both connection points (caliper, hose, junction block, master cylinder, etc.).
4. If the line runs along frame rails or underbody, inspect routing path and identify all mounting brackets and clips.
5. If fabricating a replacement line, measure the old line carefully including all bends and total length, or purchase a pre-bent OEM replacement line for the specific location.
6. Ensure you have fresh DOT 3 brake fluid from a sealed container.
7. Plan the bleeding sequence: rear passenger, rear driver, front passenger, front driver (farthest from master cylinder to closest).

Procedure

1. 1

   Raise and support vehicle
   If the damaged line is accessible from underneath, raise the vehicle with a floor jack at the appropriate jacking point (front crossmember for front work, rear differential for rear work). Support the vehicle on jack stands placed at the frame rails or manufacturer-designated lift points. Remove the wheel on the side where the line is being replaced if necessary for access. Lower the jack so the vehicle rests fully on the stands.
2. 2

   Clean fitting areas and apply penetrating oil
   Use a wire brush to clean around both line fittings at the connection points. Apply penetrating oil to the fittings and allow 10-15 minutes to soak. This is especially important on a 30+ year old vehicle where corrosion is likely. Clean away any undercoating or debris that may interfere with wrench access.
3. 3

   Place catch pan and prepare for fluid loss
   Position a catch pan under the work area to collect brake fluid that will drain from the opened line. Have shop rags ready to contain fluid flow. Brake fluid will drain from the line being disconnected and potentially from the master cylinder reservoir if the line being replaced is on a higher circuit.
4. 4

   Disconnect line at first connection point
   Using the appropriate size line wrench (typically 3/8", 7/16", or 1/2" depending on fitting location), hold the component body with a backing wrench if possible, and carefully loosen the brake line fitting. Turn counterclockwise slowly to avoid rounding the fitting. Once loose, unthread by hand and allow brake fluid to drain into the catch pan. Immediately plug the open port with a rubber cap or clean rag to minimize fluid loss and contamination entry.
5. 5

   Disconnect line at second connection point
   Move to the opposite end of the damaged brake line section. Repeat the disconnection process using a line wrench to loosen the fitting, then unthread by hand. Allow fluid to drain and plug the open port. If the line connects to a flexible brake hose, take care not to twist the hose body during removal.
6. 6

   Remove line mounting brackets
   Locate all clips and brackets securing the brake line to the frame, suspension components, or body. Remove fasteners or release spring clips holding the line in place. On the Viper, brake lines typically route along the frame rails with metal or plastic retaining clips. Note the exact routing and clip positions for reinstallation. Remove the old brake line from the vehicle.
7. 7

   Prepare replacement line
   If using a pre-bent OEM replacement line, verify it matches the old line's shape and length. If fabricating a new line, cut 3/16" steel brake tubing to the measured length using a tubing cutter for a clean, square cut. Use a tube bender to match all bends in the original line, working slowly to avoid kinking. Create double flares at both ends using a flaring tool following the tool manufacturer's instructions. Ensure flares are symmetrical and free of cracks. Thread the appropriate fittings onto the line before flaring, ensuring they face the correct direction.
8. 8

   Route and install new brake line
   Route the new brake line along the original path, ensuring it does not contact sharp edges, moving suspension components, or hot exhaust components. Maintain adequate clearance from the driveshaft and exhaust system (minimum 1 inch). Install the line into all mounting brackets and clips, securing it in the same positions as the original. Ensure the line is not twisted or kinked.
9. 9

   Connect line at both fittings
   Thread the brake line fittings into their connection points by hand first to ensure proper thread engagement and avoid cross-threading. Once hand-tight, use a line wrench to snug the fittings. Hold the component body with a backing wrench to prevent twisting hoses or damaging component threads. Torque both fittings to specification using a torque wrench and line wrench.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
10. 10

    Verify routing and clearances
    Visually inspect the entire new brake line installation. Verify the line is secured in all brackets, has proper clearance from moving and hot components, and shows no kinks or twists. If working on a front brake line, have an assistant turn the steering wheel lock-to-lock while you verify the line does not contact the tire or suspension components through the full range of motion. If working on a rear line, verify clearance during suspension travel if possible.
11. 11

    Reinstall wheel if removed
    If the wheel was removed for access, reinstall it now. Thread lug nuts by hand first, then torque in a star pattern to specification.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)
12. 12

    Fill master cylinder reservoir
    Open the hood and locate the brake master cylinder reservoir. Remove the cap and fill to the MAX line with fresh DOT 4 brake fluid from a sealed container. Do not overfill. Keep the reservoir filled above the MIN line throughout the bleeding process.
13. 13

    Bleed brake system
    Bleed the brake system in the correct sequence: rear passenger, rear driver, front passenger, front driver. At each wheel, attach clear tubing to the bleeder valve and submerge the other end in a container partially filled with clean brake fluid. Have an assistant pump the brake pedal 3-5 times and hold pressure. Open the bleeder valve with a line wrench while the assistant maintains pedal pressure. Close the valve before the pedal reaches the floor. Repeat until fluid flows with no air bubbles. Check and refill the master cylinder reservoir frequently to prevent introducing air. Torque each bleeder valve to specification after bleeding that wheel.
    Torque spec

    Bleeder Screw14 Nm (10 lb-ft)
14. 14

    Check brake pedal feel and inspect for leaks
    With the engine off, pump the brake pedal several times. The pedal should become firm and not sink to the floor. If the pedal feels soft or spongy, repeat the bleeding process. Start the engine and apply firm brake pressure while inspecting all connections on the new brake line for leaks. Check fittings at both ends and verify no fluid seepage. Wipe connections dry and recheck after 30 seconds of applied pressure.

Reassembly

1. Ensure all brake line fittings are torqued to 20 Nm (15 lb-ft) using a line wrench.
2. Verify master cylinder reservoir is filled to MAX line with DOT 3 brake fluid and cap is securely installed.
3. Dispose of old brake fluid and contaminated rags according to local environmental regulations. Do not pour brake fluid down drains.
4. Lower vehicle from jack stands and remove wheel chocks.

Verification

• With engine running, apply firm brake pedal pressure and verify pedal is firm and does not slowly sink. A sinking pedal indicates air in the system or a leak.
• Inspect all new line connections for any signs of fluid seepage with the brake pedal applied.
• Test drive the vehicle in a safe area at low speed (under 15 mph) and verify normal brake operation and pedal feel before returning to normal driving.
• After the first test drive, recheck all line fittings for leaks and verify master cylinder fluid level has not dropped.
• Over the next few days, periodically check the master cylinder fluid level. Any drop in level indicates a leak that must be found and corrected immediately.

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle