Brake Lines - Complete Set

Complete replacement of all brake lines from the master cylinder to all four calipers on a 1992 Dodge Viper, including routing, flaring, and system bleeding.

Warnings

Tools required

Parts

• Complete brake line kit (master to front calipers) × 1 — Use OEM specification or pre-bent kit for 1992 Viper
• Complete brake line kit (master to rear calipers) × 1 — Use OEM specification or pre-bent kit for 1992 Viper
• Brake line mounting clips/brackets × 1 — As needed for routing
• Copper crush washers for banjo fittings (if equipped) × 4 — Check caliper connections

Fluids

• DOT 3 brake fluid — 2 qt

Preparation

1. Park vehicle on level surface and apply parking brake.
2. Loosen all four wheel lug nuts while vehicle is on the ground.
3. Raise vehicle completely and support on four jack stands at manufacturer-specified jacking points.
4. Remove all four wheels and set aside.
5. Spray all brake line fittings with penetrating oil and allow to soak (ideally 24 hours before beginning).
6. Place drip pans under all four brake calipers and master cylinder area.
7. Have at least 2 quarts of fresh DOT 3 brake fluid available from sealed containers.
8. Photograph or diagram the exact routing of all brake lines before removal, noting every clip, bracket, and mounting point along the chassis and suspension.

Procedure

1. 1

   Drain master cylinder reservoir
   Use a turkey baster or fluid extraction pump to remove as much brake fluid as possible from the master cylinder reservoir. Dispose of old brake fluid properly (never pour down drains). This minimizes fluid loss during line removal.
2. 2

   Disconnect lines at all four calipers
   Starting at the calipers to minimize fluid loss, use a flare nut wrench to disconnect the brake line fittings at each caliper. If the Viper uses banjo bolt connections at the calipers, remove the banjo bolts and discard the copper crush washers. Immediately cap or plug the caliper ports with rubber caps or clean rags to prevent contamination. Allow lines to drain into catch pans.
3. 3

   Remove line mounting clips along chassis
   Working from each caliper back toward the master cylinder, identify and remove all clips, brackets, and fasteners securing the brake lines to the chassis, suspension components, and body. Note the exact position of each mounting point. The Viper's lines will route along the frame rails and across the firewall. Some clips may be push-type, while others use small bolts or screws. Keep all hardware organized by location.
4. 4

   Disconnect lines at master cylinder and junction blocks
   Locate all brake line connections at the master cylinder and any intermediate junction blocks or proportioning valves. Use a flare nut wrench to disconnect each line at the master cylinder. The 1992 Viper has separate front and rear circuits. Label each line position (e.g., 'LF', 'RF', 'LR', 'RR') with tape before removal. Remove lines completely from the vehicle.
5. 5

   Inspect and clean all fittings
   Inspect all fitting threads at the master cylinder, junction blocks, and calipers for damage, corrosion, or cross-threading. Use a wire brush to clean threads. If any threads are damaged, the affected component must be replaced before installing new lines. This is critical for leak-free operation.
6. 6

   Prepare new brake lines
   If using a pre-bent kit, verify each line matches the routing photographed during preparation. If fabricating custom lines, use the old lines as templates. Cut new 3/16" or 1/4" brake line tubing to length (depending on circuit), leaving 1-2 inches extra for flaring. Use a tubing cutter for clean, square cuts. Deburr all cut ends with a deburring tool or fine file.
7. 7

   Flare all line ends
   Using a double-flare tool, create SAE double flares on all line ends that connect to inverted flare fittings. The flare must be centered, smooth, and without cracks. Practice on scrap tubing if unfamiliar with the tool. Poor flares will leak under pressure and cause brake failure. If using banjo fittings, no flare is needed on those ends.
8. 8

   Install and route new lines
   Beginning at the master cylinder, thread each new line into its corresponding port and tighten finger-tight. Route each line along its original path, bending carefully with a tubing bender to match factory routing. Avoid kinks or sharp bends. Reinstall all mounting clips and brackets at their original positions, ensuring lines are secured but not over-tightened by clips (allow some float for vibration absorption). Verify full suspension travel clearance by manually compressing and extending each corner's suspension—lines must not contact any moving parts, exhaust, or sharp edges through full range of motion.
9. 9

   Connect lines at calipers
   Thread each brake line into its corresponding caliper port finger-tight. If using banjo fittings, install new copper crush washers on both sides of each banjo bolt. Verify correct line-to-caliper assignments (left front to LF caliper, etc.). Do not fully torque yet.
10. 10

    Torque all line fittings
    Using a line wrench and torque wrench, torque all line fittings at the master cylinder, junction blocks, and calipers to the factory service manual specification (verify Viper-specific values; note that inverted flare tube nuts and banjo bolts require different torque values). Work from the master cylinder outward. Use a backup wrench on caliper bodies and master cylinder ports to prevent component rotation. Over-torquing will strip soft brass fittings; under-torquing will cause leaks.
    Torque spec

    Line Fittings20 Nm (15 lb-ft)
11. 11

    Fill master cylinder reservoir
    Remove the master cylinder reservoir cap and fill with fresh brake fluid of the manufacturer-specified grade (verify DOT 3 vs DOT 4 in the owner's manual — the Viper's performance brake system may require DOT 4) to the MAX line. Keep the reservoir topped off throughout the bleeding process—never allow it to fall below the MIN line or air will enter the system.
12. 12

    Bleed brake system - right rear
    Begin bleeding at the right rear caliper (farthest from master cylinder). Attach clear plastic tubing to the bleeder screw and submerge the other end in a container with clean brake fluid. Have an assistant pump the brake pedal 3-4 times and hold pressure. Open the bleeder screw 1/4 turn; fluid and air will flow out. Close the bleeder before the pedal reaches the floor. Repeat until no air bubbles appear in the tubing. Check reservoir level frequently. Torque bleeder screw to the factory-specified value for the Viper caliper (verify in service manual) when complete.
    Torque spec

    Bleeder Screw14 Nm (10 lb-ft)
13. 13

    Bleed brake system - left rear
    Move to the left rear caliper and repeat the bleeding process from Step 12. Continue until no air bubbles appear. Torque bleeder screw to specification.
    Torque spec

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

    Bleed brake system - right front
    Move to the right front caliper and repeat the bleeding process. The front calipers may require more bleeding cycles due to higher fluid volume. Continue until no air bubbles appear. Torque bleeder screw to specification.
    Torque spec

    Bleeder Screw14 Nm (10 lb-ft)
15. 15

    Bleed brake system - left front
    Complete bleeding at the left front caliper. After this final corner shows no air bubbles, pump the brake pedal repeatedly. Pedal should become firm within 3-4 pumps and hold steady pressure. If pedal remains soft or spongy, air remains in the system; repeat bleeding sequence starting from right rear. Top off master cylinder reservoir to MAX line.
    Torque spec

    Bleeder Screw14 Nm (10 lb-ft)
16. 16

    Inspect all connections for leaks
    With the brake pedal held under firm pressure (have assistant apply 50+ lbs of pedal force), inspect every fitting at the master cylinder, junction blocks, along all new lines, and at all four calipers for signs of leakage. Look for wet spots, drips, or seeping fluid. Any leak requires immediate correction—loosen the fitting, inspect the flare or sealing surface, and re-torque. Replace the line if the flare is damaged.
17. 17

    Install wheels and lower vehicle
    Reinstall all four wheels. Torque lug nuts to the factory-specified value for the 1992 Viper (verify in service manual) in a star pattern. Lower vehicle from jack stands to the ground. Remove jack stands.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Top off master cylinder reservoir to MAX line with fresh DOT 3 fluid and install reservoir cap.
2. Verify brake pedal is firm and does not sink when held under pressure for 30 seconds.
3. Double-check all line routing for clearance to suspension, exhaust, and chassis through full suspension travel.
4. Verify all mounting clips and brackets are secure and lines are not vibrating against metal components.

Verification

• Start engine and verify brake pedal does not sink with engine running (checks for vacuum booster/master cylinder issues).
• Perform brake pedal test: Pedal should be firm within 3-4 pumps and maintain pressure without sinking.
• Test drive in a safe, empty area at low speed (under 15 mph). Apply brakes gently, then moderately—verify straight-line braking with no pull to either side.
• Perform several moderate stops from 25-30 mph to seat pads and heat the system slightly.
• After test drive, re-inspect all line fittings for leaks while system is hot and pressurized.
• Check brake fluid level—should remain at MAX line. Top off if needed.
• Verify no brake warning lights on instrument cluster.
• Before returning vehicle to normal service, perform several hard stops from 45+ mph in a safe area to verify full braking performance. If pedal feel is abnormal or stopping distance seems excessive, DO NOT drive the vehicle—repeat bleeding procedure.

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