Replacement of a single hydraulic brake line on a 2024 Tesla Cybertruck Dual Motor AWD. The Cybertruck uses a 48V low-voltage architecture and conventional hydraulic friction brakes with DOT 3 fluid; the line must be replaced and the system properly bled afterward.

Warnings

Tools required

Parts

• Replacement brake line (manufacturer-specified for the exact corner being serviced) × 1 — Tesla Cybertruck OEM brake line — match by VIN and corner location
• Copper/aluminum sealing washers (if used at banjo fitting) × 2 — Per OEM specification — replace any crush washers disturbed
• Brake line retaining clips × 1 — Replace if damaged during removal

Fluids

• DOT 3 Brake Fluid (sealed, fresh container) — 1 qt

Preparation

1. Park on level ground, place the vehicle 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 low-voltage battery. NOTE: Cybertruck uses a 48V architecture — follow Tesla's documented disconnect procedure for the 48V low-voltage battery; do not assume 12V conventions.
4. Do NOT touch, cut, or pierce ANY orange cable — these are 800V 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. Enter Service Mode / Jack Mode on the touchscreen BEFORE disconnecting low-voltage power, so the air suspension is set to a safe lift height and will not self-level.
7. Identify the exact brake line being replaced (front or rear, left or right, hard line vs. flexible hose) and obtain the correct OEM replacement part by VIN.
8. Have absorbent pads ready under the work area — brake fluid runoff must not contact stainless body panels or painted suspension components.
9. Top off or note the current brake fluid reservoir level for reference after the job.

Procedure

1. 1

   Lift the vehicle and remove the wheel
   With the vehicle in Jack Mode, lift using Tesla-approved lift points and pad adapters. Support with rated jack stands if not on a full lift. Remove the wheel at the corner where the brake line will be replaced.
   ⚠Cybertruck is significantly heavier than other Tesla models — verify your lift and stands are rated for the curb weight.
2. 2

   Cap the master cylinder reservoir to limit fluid loss
   Open the front trunk and locate the brake fluid reservoir. Either cover the reservoir vent with plastic to draw a slight vacuum, or top up and monitor — minimizing fluid drain reduces air introduction into the ABS/booster.
3. 3

   Identify and clean both ends of the brake line
   Trace the brake line being replaced from the caliper end to the chassis hard-line union (or ABS module port, depending on which line). Clean both fittings thoroughly with brake cleaner so debris does not enter the hydraulic system. Note the exact routing and any retaining clips or brackets — photograph for reference.
4. 4

   Loosen the upper (chassis-side) fitting first
   Using a proper line (flare-nut) wrench, break loose the upper hard-line union nut. Do NOT use an open-end wrench — flare nuts round off easily. If the line uses a banjo bolt at one end, note the sealing washers for replacement.
   ⚠Use a line wrench only. A rounded fitting will require replacing additional hard line sections.
5. 5

   Disconnect the caliper (lower) end
   Loosen and remove the fitting at the caliper end. Position a catch container — fluid will drain. If a banjo bolt is used, discard the old sealing washers; they are single-use.
   ⚠Brake fluid contact with the stainless exoskeleton or painted suspension parts must be wiped immediately.
6. 6

   Release retaining clips and remove the old line
   Release any chassis retaining clips, grommets, or P-clamps along the line's route. Carefully remove the old line, taking note of every routing point so the new line follows the identical path with no contact against suspension, drivetrain, or rotating components.
7. 7

   Install the new brake line
   Route the new manufacturer-specified line along the original path. Hand-thread BOTH end fittings before tightening either — this prevents cross-threading. Install new sealing washers if the design uses banjo fittings. Reinstall all retaining clips and brackets so the line cannot move, vibrate, or contact moving parts.
   ⚠The flexible portion of the line must not twist when tightened. Verify it sits naturally through full suspension travel and full steering angle (where applicable).
8. 8

   Torque both line fittings
   Using a line wrench on a calibrated torque wrench (or a crowfoot adapter with the correct length-correction calculation), torque the upper and lower line fittings to specification. Confirm fittings are fully seated and not weeping.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
9. 9

   Reinstall any disturbed caliper hardware
   If the caliper, caliper bracket, or slide pins were loosened to access the line, reinstall using thread locker where specified and torque to OEM specification. Apply silicone brake grease to slide pins.
   Torque spec

   Caliper Bolts88 Nm (65 lb-ft)

   Bracket Bolts102 Nm (75 lb-ft)

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
10. 10

    Bleed the brake system at the affected corner
    Top off the reservoir with fresh DOT 3. Attach a clear hose to the bleeder screw on the affected caliper, submerged in a small amount of clean fluid in a catch bottle. Bleed using pressure, vacuum, or two-person pedal method until clear, bubble-free fluid flows. Continuously monitor and refill the reservoir — never let it run dry. Tesla typically specifies a bleed sequence; verify with the Service Manual for the Cybertruck.
    ⚠VERIFY THE CORRECT BLEED SEQUENCE in the Tesla Service Manual for Cybertruck. An incorrect sequence may leave air in the ABS/iBooster module, requiring a scan-tool-assisted bleed.
    ℹ️If the pedal remains spongy after bleeding, an ABS module bleed routine may be required — this needs Tesla service software.
    Torque spec

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

    Final torque on the bleeder screw
    Close and torque the bleeder screw to specification. Do not overtighten — bleeder screws strip easily.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
12. 12

    Top off reservoir and inspect for leaks
    Fill the reservoir to the MAX line with fresh DOT 3. With an assistant pressing the brake pedal firmly and holding, inspect both new fittings, the bleeder, and any banjo washer joints for leaks or weeping. Wipe everything dry and re-inspect after pedal cycling.

Reassembly

1. Reinstall the wheel and torque the lug nuts in a star pattern to specification.
2. Lower the vehicle to the ground.
3. Reconnect the 48V low-voltage battery following Tesla's documented procedure.
4. Exit Jack Mode / Service Mode on the touchscreen and allow the air suspension to return to normal ride height.
5. Clean any brake fluid residue from suspension, body, and wheel surfaces with water and a clean rag — do not allow residue to remain on the stainless exoskeleton.

Verification

• With the vehicle running and brake-by-wire system fully initialized, press the brake pedal firmly several times — pedal must be firm and consistent, not spongy or sinking.
• Inspect both ends of the new line and the bleeder screw for leaks after 5–10 firm pedal applications.
• Check the touchscreen for any ABS, traction, stability, or brake-related warnings. If any appear, an ABS module bleed using Tesla service software may be required.
• Perform a low-speed brake test in a safe area (5–10 mph) before any road test. Confirm the vehicle stops straight with no pulling and no abnormal pedal feel.
• Perform a moderate-speed road test (25–35 mph) on a clear road, verifying normal braking, no pull, and no warning lights.
• Recheck fluid level after the road test and top off to MAX if needed.
• Note: Tesla recommends a complete brake fluid service every 2 years regardless of mileage. If the existing fluid is older than 2 years or appears dark, perform a full flush while the system is already open.
• Record the repair date and mileage for future reference.

More procedures for this vehicle