Replace a single hydraulic brake line on a 2024 Model X. The job involves opening the brake hydraulic system, swapping the failed line, and bleeding the affected corner using DOT 3 fluid.

Warnings

Tools required

Parts

• Replacement brake line (manufacturer-specified for affected corner) × 1 — OEM Tesla brake line — match exact corner and routing for 2024 Model X LR AWD
• Sealing washers / clips as required by line type × 1 — OEM specification — replace any single-use crush washers or retaining clips

Fluids

• DOT 3 Brake Fluid (Tesla-spec) — 1 qt

Preparation

1. Park on level ground, place in P, and engage the parking brake.
2. Exit ALL doors with the key fob away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize, even on this non-HV job.
3. Disconnect the 12V low-voltage battery in the frunk (similar location to Model S). Remove the frunk liner/cover, disconnect the negative terminal first, and isolate the cable.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
5. If at any point you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Enable 'Jack Mode' via the touchscreen before disconnecting 12V (suspension will hold ride height during lift). If 12V is already disconnected, ensure the vehicle was placed in Jack Mode beforehand.
7. Loosen the wheel lug nuts on the affected corner while the wheel is on the ground.
8. Raise the vehicle at the manufacturer-specified lift points using approved Tesla jack pads. Support on rated jack stands.
9. Remove the wheel at the affected corner.
10. Inspect the full length of the brake line you intend to replace, noting all clip locations, brackets, and routing for reinstallation. Photograph if helpful.
11. Check brake fluid level in the reservoir (frunk area) and top off with DOT 3 if low; do not overfill.

Procedure

1. 1

   Minimize fluid loss at the reservoir
   Open the brake fluid reservoir cap briefly to confirm fluid type/level, then reinstall. Optionally place a clean shop rag around the reservoir to catch drips. Some technicians use a bleeder cap or syringe to lower fluid level slightly to prevent overflow when the line is opened — do not let the reservoir run dry.
   ⚠Do not allow the master cylinder reservoir to run empty during the job — this introduces air into the ABS/iBooster module and significantly complicates bleeding.
2. 2

   Position drain pan and prepare to crack fittings
   Place a catch pan beneath the brake line junctions you will open. Have plugs or caps ready for both ends of the disconnected line.
3. 3

   Loosen the brake line fittings
   Using a flare-nut (line) wrench, carefully break loose both end fittings of the brake line — typically one at the caliper hose junction or hard-line union, and one at the chassis-side union or ABS/proportioning point as applicable to this corner. Do not fully remove yet. If a fitting is seized, apply penetrating oil and re-attempt; do not round the fitting with an open-end wrench.
   ⚠Brake line fittings are soft. Use a flare-nut wrench only — open-end wrenches will round the hex.
4. 4

   Release retaining clips and brackets
   Identify and release all retaining clips, grommets, and bracket fasteners holding the brake line to the chassis or suspension. Note orientation. If the line passes through any wire-loom guides, free it carefully without disturbing wheel speed sensor or pad wear sensor wiring.
   ⚠Avoid pinching or kinking ABS wheel-speed sensor wiring; the Model X uses these signals for stability control and Autopilot/regen blending.
5. 5

   Disconnect and remove the old line
   Fully unscrew both fittings. Allow fluid to drain into the catch pan. Plug both open ends on the vehicle (reservoir-side and caliper-side) immediately to minimize fluid loss and air ingress. Remove the old line from the vehicle.
6. 6

   Compare new line to old
   Lay the replacement line alongside the removed part. Confirm length, bend geometry, fitting types/sizes, and any integrated brackets match exactly. A mismatched line will not route correctly and may chafe against suspension or driveshaft components.
7. 7

   Install the new brake line
   Route the new line following the original path. Hand-thread both end fittings first to avoid cross-threading. Reinstall all retaining clips and brackets in their original positions. Confirm the line is not in contact with any moving suspension component, hot driveline part, or sharp edge throughout full suspension travel.
   ⚠Always start fittings by hand. Cross-threading a brake fitting destroys the seat and the line must be discarded.
8. 8

   Tighten brake line fittings
   Snug both end fittings with a flare-nut wrench. Torque to OEM specification — refer to Tesla Service Manual. (Brake line tube-nut torque is not in our verified data; do not guess.) Any associated bracket fasteners that secure the line or its mounting tab should be torqued per the verified spec.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
9. 9

   Top off the master cylinder reservoir
   Refill the brake fluid reservoir in the frunk area with fresh DOT 3 brake fluid to the MAX line. Keep the bottle sealed when not pouring.
10. 10

    Bleed the affected corner
    Attach a clear hose to the caliper bleeder screw at the affected corner and submerge the other end in a small amount of clean brake fluid in a catch bottle. Using a pressure bleeder, vacuum bleeder, or two-person pedal method, bleed until clean fluid free of air bubbles flows steadily. Monitor the reservoir continuously and refill as needed — never let it run dry. Close the bleeder.
    ⚠If air may have entered the ABS/iBooster, a Tesla-approved scan tool is required to perform an automated ABS bleed sequence. A pedal-only bleed will not purge air from the modulator.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
11. 11

    Final fluid level and leak check
    Top off the reservoir to the MAX line and reinstall the cap. With an assistant pressing the brake pedal firmly and holding, inspect both new fittings and the bleeder for any seepage. Wipe each joint dry, then re-pressurize and re-inspect.

Reassembly

1. Reinstall the wheel and hand-thread all lug nuts.
2. Lower the vehicle until the tire just contacts the ground, then torque the lug nuts in a star pattern.
3. Fully lower the vehicle and remove jack stands.
4. Reconnect the 12V battery (positive first, then negative). Reinstall frunk liner/cover.
5. Close the frunk and exit Jack Mode via the touchscreen once the vehicle wakes.
6. Allow the air suspension to self-level before driving.
7. Clean any spilled brake fluid from painted, plastic, or rubber surfaces with water.

Verification

• With the vehicle awake and brake pedal pressed multiple times: pedal should be firm and high, not spongy. A soft pedal indicates remaining air — re-bleed.
• Inspect the new line and both fittings under firm pedal pressure for any weeping or seepage.
• Drive slowly in a safe area and perform several gentle stops, then a firm stop, confirming straight, even braking with no warning lights on the touchscreen (no ABS, ESC, or 'Service Brakes' alerts).
• Check the touchscreen for any chassis fault messages after the first drive cycle.
• Re-check fluid level after the test drive and top off to MAX if needed.
• Note: Tesla recommends a complete brake fluid flush every 2 years. Record today's date — if the existing fluid was older than 2 years, schedule or perform a full flush at the next service.
• Re-torque the wheel lug nuts after approximately 50–100 miles of driving.

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