Complete replacement of all brake lines from the master cylinder to all four calipers, including all hard lines, fittings, and flexible hoses.

Warnings

Tools required

Parts

• Complete brake line set (pre-bent for 2011-2014 F-150) × 1 — Use OEM Ford or high-quality aftermarket pre-bent kit
• Brake line mounting clips and brackets × 1 — Included with line kit or purchase separately
• Brake line fittings and adapters × 1 — M10x1.0 and M12x1.0 typical
• Flexible brake hoses (all 4 wheels) × 4 — Front and rear specific hoses
• Copper crush washers for banjo fittings × 8 — Various sizes, typically included with hoses
• Brake line retaining clips × 1 — Use OEM specification

Fluids

• Motorcraft DOT 4 LV Brake Fluid — 2 qt

Preparation

1. Park vehicle on level, solid surface. Place transmission in Park, engage parking brake fully, and place wheel chocks behind rear wheels
2. Disconnect negative battery terminal to prevent accidental ABS pump activation during service
3. Raise entire vehicle and support on four jack stands at frame contact points. Verify stability before working underneath
4. Remove all four wheels and set aside
5. Photograph or diagram existing brake line routing from master cylinder to all four corners before removal
6. Place drain pans under work areas to catch brake fluid spills
7. Apply penetrating oil to all brake line fittings and allow to soak 15-30 minutes before attempting removal
8. Have complete brake line kit unpacked and organized with all fittings, clips, and brackets identified
9. Verify you have correct replacement lines for 4WD configuration (different routing than 2WD models)

Procedure

1. 1

   Drain brake fluid from master cylinder
   Use a turkey baster or fluid transfer pump to remove as much brake fluid as possible from the master cylinder reservoir. This minimizes fluid loss and contamination during line removal. Dispose of old brake fluid according to local regulations. Never reuse old brake fluid.
2. 2

   Remove front flexible brake hoses
   Starting at the front wheels, use a flare nut wrench to disconnect the hard line from the flexible hose at the frame bracket. Hold the hose fitting with a backup wrench to prevent twisting. Remove the retaining clip or bolt securing the hose to the frame bracket. At the caliper end, remove the banjo bolt (or threaded fitting) and discard the copper crush washers. Cap or plug all open lines and ports immediately to prevent contamination.
   ⚠Use flare nut wrenches only - standard wrenches will round off the soft brass fittings. If fitting begins to round, stop and use penetrating oil or heat.
3. 3

   Remove rear flexible brake hoses
   Repeat the flexible hose removal process for both rear wheels. On 4WD models, note that rear hose routing may pass through frame brackets differently than 2WD. Disconnect at both the hard line junction and the caliper/wheel cylinder end. Cap all openings immediately.
4. 4

   Remove hard lines from master cylinder to ABS unit
   At the master cylinder, use flare nut wrenches to disconnect the two main outlet lines (primary and secondary circuits). These are typically M12x1.0 fittings. Follow these lines to the ABS hydraulic control unit (HCU) located under the hood near the driver's side frame rail. Disconnect all hard lines from the HCU using appropriate flare nut wrenches. Note the position of each line - front/rear and left/right circuits must not be crossed.
   ⚠️Do not confuse brake line circuits. The primary and secondary circuits serve different wheel combinations. Crossing these lines will result in dangerous brake imbalance.
5. 5

   Remove hard lines from ABS unit to frame rails
   Trace each line from the ABS unit along the frame rails toward each corner of the vehicle. Remove all mounting clips and brackets securing lines to the frame. Use flare nut wrenches to disconnect lines at junction points. On F-150, lines typically run along driver's side frame rail and cross over near rear axle for passenger side service. Remove all old clips and brackets as lines are disconnected.
6. 6

   Remove remaining hard lines to wheel junctions
   Follow all hard lines to their termination points at the flexible hose junctions near each wheel. Disconnect and remove all remaining hard line sections. Remove all mounting hardware, clips, and brackets. Inspect frame attachment points and clean any rust or debris where new clips will mount.
7. 7

   Clean and prepare all mounting points and fittings
   Wire brush all brake line mounting points on the frame, ABS unit, and master cylinder. Clean all threaded fittings with brake parts cleaner. Inspect all ports for damage or corrosion. Chase damaged threads with appropriate tap if necessary. Blow out all fittings with compressed air to remove debris. Ensure all mounting clip locations are clean and ready for new hardware.
8. 8

   Install new hard lines from master cylinder to ABS unit
   Beginning at the master cylinder, route new hard lines to the ABS hydraulic control unit following OEM path. Install lines loosely at first - do not fully tighten. Ensure lines are not kinked, twisted, or contacting sharp edges. Install mounting clips to hold lines in proper position along frame. Once routing is verified correct, tighten fittings to proper torque using flare nut wrench. Typical torque is 12-15 Nm (10-12 lb-ft) for M10x1.0 fittings and 15-18 Nm (12-14 lb-ft) for M12x1.0 fittings, though verify with line kit specifications.
   ⚠Do not overtighten brake line fittings. Brass fittings strip easily. Tighten until snug, then use torque wrench for final tightening.
9. 9

   Install hard lines from ABS unit to frame junctions
   Route new hard lines from ABS unit along frame rails to junction points near each wheel. Follow the OEM routing path documented in your photos. Install all mounting clips and brackets loosely first. Ensure minimum 1/2 inch clearance from exhaust components, driveshaft, and suspension travel points. Verify lines will not contact tires at full steering lock. Once routing is confirmed, tighten all fittings and secure all mounting clips.
   ⚠️Brake lines must have adequate clearance from all moving components including suspension, driveshaft, and steering linkage. Contact can wear through lines causing sudden brake failure.
10. 10

    Install new flexible brake hoses at all four wheels
    Install new flexible brake hoses starting with the frame bracket end. Insert hose through bracket and install retaining clip or bolt with mounting hardware. Connect hard line to hose using flare nut wrench - tighten to specification (typically 15-18 Nm). At the caliper end, install new copper crush washers on both sides of the banjo fitting. Thread banjo bolt through hose fitting and into caliper, torque to specification (typically 30-35 Nm for banjo bolts). Ensure hoses are not twisted and have adequate slack for full suspension travel and steering movement.
    ⚠Always use NEW copper crush washers on banjo fittings. Reusing old washers will cause leaks. Ensure one washer is on each side of the fitting.
11. 11

    Verify all connections and routing
    Systematically inspect every brake line connection from master cylinder to all four calipers. Verify all fittings are properly tightened to specification. Check that all mounting clips are installed and secure. Verify no lines are kinked, twisted, or contacting other components. Turn steering wheel lock-to-lock and verify front hoses have adequate slack and clearance. Push down on suspension at all four corners to verify lines have clearance through full suspension travel.
12. 12

    Fill and perform initial brake system bleed
    Fill master cylinder reservoir with fresh Motorcraft DOT 4 LV brake fluid to MAX line. Beginning at the wheel furthest from master cylinder (typically right rear), attach bleeder hose to bleeder screw. Open bleeder screw 1/2 turn and allow fluid/air to gravity bleed until solid stream of fluid flows with no bubbles. Close bleeder screw. Repeat for each wheel in sequence: right rear, left rear, right front, left front. Keep master cylinder reservoir filled above MIN line throughout process.
    ⚠️Never allow master cylinder to run dry during bleeding. This introduces air into ABS unit which requires special scan tool procedure to purge.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
13. 13

    Perform pressure bleeding procedure
    Using a pressure brake bleeder set to 20-25 PSI, connect to master cylinder reservoir. Starting at right rear wheel, open bleeder screw and allow pressurized fluid to flow until completely clear with no bubbles. Close bleeder screw to torque specification (10 Nm / 7 lb-ft). Repeat for left rear, right front, then left front. If pedal remains soft, perform ABS module bleeding procedure: With pressure bleeder attached, cycle ignition on (engine off) and activate ABS pump using factory scan tool or repeat conventional bleed process 2-3 times.
    ⚠Do not exceed 25 PSI with pressure bleeder. Excessive pressure can damage ABS seals and master cylinder.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
14. 14

    Perform brake pedal firmness test
    With engine off, pump brake pedal 20-30 times to deplete vacuum assist. Pedal should become progressively firmer and hold steady pressure without sinking. Apply firm steady pressure (50-60 lbs) to pedal for 30 seconds - pedal should not sink. Start engine and verify pedal drops slightly as vacuum assist activates. If pedal is soft or sinks, air remains in system - repeat bleeding procedure.
    ⚠️Do not operate vehicle if brake pedal is soft, spongy, or sinks under steady pressure. This indicates air in system or other serious fault.
15. 15

    Install wheels and perform final inspection
    Reinstall all four wheels, torquing lug nuts to 140 Nm (103 lb-ft) in star pattern. Lower vehicle to ground. Reconnect negative battery terminal. Inspect all brake line connections for any sign of fluid seepage. Check master cylinder reservoir level and top off to MAX line with DOT 4 LV fluid. Start engine and apply firm brake pressure while inspecting all connections - no leaks should be visible.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Double-check that all brake line fittings are torqued to specification with no signs of cross-threading or damage
2. Verify all mounting clips and brackets are installed and secure - loose lines can vibrate and crack
3. Confirm master cylinder reservoir is filled to MAX line with correct DOT 4 LV fluid
4. Ensure all tools and materials are removed from under vehicle and engine compartment

Verification

• Perform complete visual inspection of all brake line connections from master cylinder to all four calipers - no fluid seepage should be visible
• Start engine and apply firm brake pressure for 60 seconds while assistant inspects all connections for leaks
• Test brake pedal: should be firm with 1-2 inches of travel before strong resistance. Pedal should not sink under steady pressure
• Perform low-speed test drive in safe area: test brakes at 5 MPH, 10 MPH, and 15 MPH to verify proper function and firm pedal feel
• Verify no brake warning lights are illuminated on instrument cluster
• Test drive at progressively higher speeds only after verifying firm pedal and proper function at low speeds
• Perform ABS self-test by triggering ABS on loose gravel or wet surface at 20 MPH to verify proper ABS function (pulsating pedal during activation is normal)
• After first 50 miles, re-inspect all brake line connections for any signs of seepage and re-torque any fittings if necessary
• Monitor brake pedal feel and master cylinder fluid level for first 500 miles - any change indicates potential leak or air in system

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