Complete replacement of all brake lines from master cylinder to all four wheels, including hard lines and flexible hoses, ensuring proper routing and complete system bleeding.

Warnings

Tools required

Parts

• Complete brake line kit for 2011-2014 F-150 4WD × 1 — OEM or equivalent stainless steel kit
• Front brake hose assemblies × 2 — Use OEM specification
• Rear brake hose assemblies × 2 — Use OEM specification
• Brake line mounting clips and brackets × 1 — Use OEM specification
• Flare fittings and adapters (assorted) × 1 — As needed for custom fabrication
• Brake line hold-down clips × 10 — Use OEM specification

Fluids

• Motorcraft DOT 4 LV Brake Fluid — 2 qt

Preparation

1. Park vehicle on level, stable ground and engage parking brake. Place wheel chocks behind rear wheels.
2. Document all existing brake line routing with photographs from multiple angles, especially at junctions and mounting points.
3. Apply penetrating oil to all brake line fittings, brackets, and connections. Allow to soak for at least 2 hours (24 hours preferred).
4. Raise vehicle and secure on jack stands at all four corners. Ensure vehicle is completely stable before working underneath.
5. Remove all four wheels and set aside.
6. Have at least 2 quarts of fresh Motorcraft DOT 4 LV brake fluid available from sealed containers.
7. Lay out new brake line kit and verify all components match existing lines. Check that flexible hoses have correct thread pitch and banjo bolt configurations.
8. Organize tools and establish clean workspace for flaring and bending operations if custom fabrication is needed.
9. Locate master cylinder and identify all primary brake line connections. Note that 2011-2014 F-150 uses diagonally split brake system.

Procedure

1. 1

   Remove master cylinder line connections
   Using a flare nut wrench, carefully loosen the brake line fittings at the master cylinder. There are typically two primary outlets. Use a second wrench to hold the master cylinder fittings to prevent twisting. Allow fluid to drain into catch pan. Cap or plug master cylinder ports immediately with clean plugs to prevent contamination.
2. 2

   Remove junction block and proportioning valve connections
   Locate the brake junction block on the frame rail (typically driver side). Carefully document which line goes to which port with tags or photos. Using flare nut wrenches, disconnect all lines from the junction block. For lines with proportioning valves, note orientation before removal. Cap all open ports immediately.
3. 3

   Remove front brake line mounting brackets
   Trace front brake lines from master cylinder to front wheels. Remove all mounting bracket bolts securing hard lines to frame and suspension components. Keep brackets organized by location for reinstallation. Inspect rubber isolators in brackets and replace if cracked or deteriorated.
   ⚠Note exact position of each bracket as improper placement can cause line interference with moving suspension components.
   Torque spec

   Bracket Bolts127 Nm (94 lb-ft)
4. 4

   Disconnect front flexible brake hoses
   At each front wheel, locate the flexible brake hose connection to the caliper. Use a flare nut wrench on the hose fitting and a backup wrench on the caliper port. Remove the hose-to-hard line connection at the frame mount. Remove the U-clip or retaining bracket securing the hose to the mounting point. Drain fluid into catch pan.
   ⚠Flexible hoses have a specific orientation. Mark the hose position relative to mounting bracket before removal to prevent twisted installation.
5. 5

   Remove front hard brake lines
   Working from wheel end toward master cylinder, remove front hard brake lines completely. These run along the frame rail. Note any clips or retaining points. If lines are seized or corroded, cut them if necessary, but preserve fittings at junction points for reference when fabricating replacements.
6. 6

   Remove rear brake line mounting and brackets
   Remove all mounting brackets securing rear brake lines along frame rails from junction block to rear axle. On 4WD models, pay special attention to lines routing around transfer case and rear differential. Document clearances to driveshaft and exhaust components.
   ⚠Rear lines on 4WD F-150 have critical clearance to driveshaft. Improper routing can cause catastrophic line failure during operation.
   Torque spec

   Bracket Bolts127 Nm (94 lb-ft)
7. 7

   Disconnect rear flexible brake hoses
   At rear axle housing, disconnect flexible brake hoses from hard lines and from wheel cylinders or calipers (depending on rear brake configuration). Remove hose retaining brackets from axle housing. Note that rear hoses must have sufficient length to accommodate axle articulation.
8. 8

   Remove rear hard brake lines
   Remove remaining hard brake lines from vehicle. This includes lines running along frame to rear axle and any axle-mounted hard lines. Clean all mounting surfaces and inspect frame for rust or damage that could compromise new line mounting.
9. 9

   Fabricate or prepare replacement lines
   If using pre-fabricated line kit, verify each line against removed components for correct length and fitting configuration. If custom fabricating, use original lines as templates. Cut tubing to length with tubing cutter (not hacksaw unless deburred thoroughly). Create double flares on all cut ends using proper flaring tool. Test-fit all flares before installation. Bend lines to match original routing using tubing bender to avoid kinks.
   ⚠️Improperly formed flares WILL leak and cause brake failure. Each flare must be perfectly concentric with no cracks or splits. If in doubt, remake the flare.
   ⚠Brake line tubing must be appropriate grade steel or approved stainless steel. Never use copper or compression fittings on brake systems.
10. 10

    Install rear hard brake lines
    Beginning at the junction block, route new rear hard brake lines along frame rails following documented original path. Install lines into mounting brackets but do not fully tighten bracket bolts yet. Ensure minimum 1-inch clearance from exhaust components and driveshaft. Connect lines to junction block and rear axle connection points hand-tight only at this stage.
11. 11

    Install rear flexible brake hoses
    Install new rear flexible brake hoses to axle housing mounting brackets. Ensure hoses are not twisted by aligning any orientation marks or ribs on hose body. Connect hoses to hard lines at frame and to wheel cylinders/calipers. Hand-tighten all fittings. Verify hoses have adequate slack for full suspension droop and compression travel.
    ⚠️Flexible hoses MUST have sufficient length to prevent tension during suspension travel. Cycle suspension through full range of motion to verify adequate clearance before final tightening.
12. 12

    Install front hard brake lines
    Route front hard brake lines from master cylinder along frame rails to front wheel mounting points following original path. Install into mounting brackets loosely. Ensure clearance from steering components throughout full steering range. Connect to master cylinder and junction block hand-tight.
13. 13

    Install front flexible brake hoses
    Install front flexible brake hoses with proper orientation (no twisting). Secure hoses to frame mounting brackets with U-clips or retaining hardware. Connect to hard lines and calipers hand-tight. Verify hoses have clearance during full steering lock and suspension travel in both directions.
    ⚠️Turn steering wheel full lock to lock and verify brake hoses do not contact tires, suspension arms, or steering components. Check at full suspension compression and extension.
14. 14

    Tighten all line fittings and secure brackets
    Working from master cylinder outward, tighten all brake line fittings using flare nut wrenches. Tighten fitting snugly but do not over-torque (typically 10-12 lb-ft for 3/16-inch lines, but use feel rather than torque wrench on flare fittings to avoid stripping). Tighten all mounting bracket bolts to specification. Secure all lines with retaining clips. Double-check all connections for proper seating.
    ⚠Flare fittings are precision components. Over-tightening will damage flare seat and cause leaks. Tighten until snug plus approximately 1/6 turn.
    Torque spec

    Bracket Bolts127 Nm (94 lb-ft)
15. 15

    Bleed brake system - master cylinder
    Fill master cylinder reservoir with fresh DOT 4 LV brake fluid to MAX line. Bench-bleed master cylinder if it was removed, or bleed at master cylinder outlet ports by cracking each fitting while assistant pumps brake pedal slowly. Tighten before pedal reaches floor. Repeat until fluid flows without bubbles. Keep reservoir full throughout entire bleeding process.
    ⚠️Never allow master cylinder reservoir to run dry during bleeding or air will enter system requiring complete re-bleeding.
16. 16

    Bleed brake system - all wheels
    Bleed brakes in proper sequence: Right Rear, Left Rear, Right Front, Left Front (farthest to nearest from master cylinder). At each wheel, attach bleeder hose to bleeder screw. Have assistant pump brake pedal 3-4 times and hold pressure. Open bleeder screw while pedal is held, allowing fluid and air to escape, then close bleeder before pedal reaches floor. Repeat until fluid flows clear without bubbles. Torque bleeder screws to specification. Check and refill master cylinder reservoir frequently.
    ⚠️Bleeder screws are easily over-torqued and will break or strip. Use exact torque specification of 10 Nm (7 lb-ft).
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
17. 17

    Perform brake pedal firmness test
    With engine off, pump brake pedal repeatedly. Pedal should become firm and maintain height. If pedal sinks slowly or feels spongy, air remains in system and re-bleeding is required. Start engine and verify power brake boost is functioning. Pedal should drop slightly when engine starts but remain firm.
    ⚠️Do NOT proceed if brake pedal feels soft, spongy, or sinks to floor. This indicates air in system or a leak. Re-bleed completely and inspect all connections for leaks.
18. 18

    Inspect for leaks and install wheels
    With vehicle still on jack stands and wheels removed, inspect every brake line connection, fitting, and flexible hose for signs of fluid leakage. Wipe all connections dry, then have assistant apply firm brake pedal pressure for 30 seconds while you inspect. Address any leaks immediately. If no leaks are found, reinstall wheels and torque lug nuts to specification in star pattern.
    ⚠Even small brake fluid weeps indicate improper fitting seat or damaged flare. Do not ignore any fluid seepage.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Ensure all brake line mounting brackets are torqued to specification and lines are secured with all retaining clips.
2. Verify master cylinder reservoir is filled to MAX line with fresh DOT 4 LV brake fluid and cap is securely installed.
3. Double-check that all bleeder screws are closed and torqued properly.
4. Confirm all flexible brake hoses have proper clearance during full range of suspension and steering movement.
5. Clean all brake fluid residue from brake components, suspension, and frame with water immediately to prevent paint damage.
6. Verify all tools and materials are removed from under vehicle and workspace is clear.

Verification

• Lower vehicle to ground and torque wheel lug nuts again in star pattern to 140 Nm (103 lb-ft).
• Start engine and verify firm brake pedal with approximately 2-3 inches of free play before resistance.
• Perform a series of low-speed stops (5-10 mph) in a safe area to verify even braking and proper brake function.
• Check for any pulling to one side during braking which could indicate air in one circuit or a kinked line.
• Perform several moderate stops from 30-40 mph in a safe area to heat brakes and verify no fade or fluid boiling occurs.
• Re-inspect all brake line connections for any fluid seepage after test drive.
• Verify brake warning light is not illuminated on dashboard.
• Check master cylinder fluid level again and top off if needed. Recheck after 50-100 miles of driving.
• Road test vehicle in safe area with no traffic and perform hard stop from 50 mph to verify full braking capability before returning to normal service.
• Schedule re-inspection of all connections after 500 miles of driving to verify no leaks have developed and fittings remain tight.

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