Brake Lines - Complete Set

Complete replacement of all hydraulic brake lines on a 2024 Tesla Cybertruck Dual Motor. The Cybertruck uses a 48V iBooster-style electro-hydraulic brake system with DOT 3 fluid; full system bleeding is mandatory after line replacement.

Warnings

Tools required

Parts

• Complete OEM brake line set (front and rear hard lines) × 1 — Tesla Cybertruck-specific brake line kit — use OEM only; aftermarket lines are not validated for this iBooster system
• Front flexible brake hoses × 2 — OEM Cybertruck front brake hose, left and right
• Rear flexible brake hoses × 2 — OEM Cybertruck rear brake hose, left and right
• Copper sealing washers for banjo fittings (if applicable) × 8 — Per OEM caliper banjo specification
• Brake line retaining clips × 1 — OEM chassis routing clips — replace any deformed on removal

Fluids

• DOT 3 Brake Fluid (sealed, fresh container) — 2 qt

Preparation

1. Park on level ground, place in P, engage 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. Before disconnecting low-voltage power, enter the vehicle's touchscreen Service menu and enable Jack Mode / Transport Mode so the air suspension does not attempt to self-level on the lift.
4. Disconnect the 48V low-voltage battery per Cybertruck service procedure (note: this is a 48V architecture, not 12V — connectors and fusing differ from prior Teslas).
5. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
6. 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.
7. Chock wheels, raise the vehicle on a lift or jack stands rated for Cybertruck weight, and remove all four wheels.
8. Place absorbent pads under the brake fluid reservoir and along the line routing to catch drips.
9. Photograph the existing brake line routing, clip locations, and fitting orientations at every caliper, the iBooster/master assembly, and the rear axle splitter before disassembly. The Cybertruck's routing is specific and incorrect routing can cause line chafe failures.

Procedure

1. 1

   Drain the brake fluid reservoir
   Open the front trunk and locate the brake fluid reservoir at the iBooster/master cylinder assembly. Use a clean fluid extractor (turkey baster or syringe) to remove as much fluid as possible from the reservoir. Discard the old fluid — do not reuse. This minimizes spillage when lines are opened.
   ⚠Do not let the reservoir run completely dry while the iBooster is powered — air ingestion into the booster requires an extended scan-tool bleed to recover.
2. 2

   Crack each fitting before full removal
   Starting at each caliper and at the master/ABS unit, use a flare-nut (line) wrench to loosen each hard-line fitting about 1/4 turn to confirm it will release without rounding. If a fitting is seized, apply penetrating oil and allow it to soak — do not force a 6-point socket onto a brake-line nut.
   ⚠Use a line wrench only. Open-end wrenches will round the soft fitting flats.
3. 3

   Disconnect flexible hoses at each caliper
   At each of the four calipers, disconnect the flexible brake hose from the caliper. If the caliper uses a banjo fitting, remove the banjo bolt and discard both copper sealing washers. If it uses an inverted-flare fitting, hold the caliper port with a backup wrench while loosening the hose nut. Cap the caliper port immediately to prevent contamination.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
4. 4

   Release flexible hose chassis brackets
   At each corner, release the flexible hose from its chassis-side bracket. Cybertruck flex hoses are retained at the bracket by a horseshoe clip — slide the clip outward with a small flat screwdriver, then pull the hose fitting through the bracket. Do not twist the hose; rotate the hard-line union nut only.
5. 5

   Disconnect hard lines at the master/ABS unit
   At the iBooster/ABS hydraulic block in the front trunk area, identify and label each outgoing hard line (typically 4 ports — one per corner — though routing may consolidate at a rear splitter). Loosen each fitting with a line wrench and carefully back the lines away from the block. Cap each port on the ABS unit to keep dirt and moisture out.
   ⚠Do not pry on or stress the ABS/iBooster ports. The unit is not separately serviceable in the field.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
6. 6

   Release hard line retaining clips along the chassis
   Working from front to rear, release each plastic/metal retaining clip securing the hard lines to the chassis and underbody. Note clip locations and orientations from your reference photos. Clips that deform on removal must be replaced — reusing a sprung clip allows line vibration and chafe failure.
   ⚠Brake hard lines on the Cybertruck route in close proximity to the HV battery enclosure. Do not pull or pry lines toward the orange HV harness.
7. 7

   Remove the old hard lines
   With all fittings disconnected and clips released, gently work the old hard lines free of the chassis and remove them from the vehicle. Lay them out on a clean surface in the same orientation as installed — they will serve as the bend pattern reference for the new lines.
8. 8

   Compare new lines to old
   Lay each new OEM line next to its old counterpart and confirm length, bend geometry, and fitting type match exactly. If a line does not match, STOP — verify the correct part number before installation. Incorrectly routed lines will chafe against the chassis or HV pack heat shielding.
9. 9

   Install new hard lines and seat in clips
   Route each new hard line along the original path, seating it into each chassis clip as you go. Start fittings at both ends by hand to ensure threads are not cross-threaded — brake-line flare fittings are easy to cross-thread and ruin. Do not fully tighten until both ends and all clips are engaged so the line can self-align.
   ⚠If any fitting will not start by hand, stop and inspect the flare. A damaged flare must be replaced — do not attempt to seal it with thread sealant.
10. 10

    Install new flexible hoses at each corner
    Install the new flex hose at each corner. At the chassis end, pass the hose fitting through the bracket and reinstall the horseshoe retaining clip — confirm the clip is fully seated. At the caliper end, install with new copper crush washers if banjo-style, or with a backup wrench on the caliper port if inverted-flare. Ensure the hose is not twisted and clears suspension travel through full lock-to-lock and full droop/compression.
    ⚠A twisted flex hose will fail prematurely. Verify the hose lays naturally with no rotational preload.
    Torque spec

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

    Torque all hydraulic fittings
    Torque every hard-line fitting at the calipers, splitters, and ABS/iBooster block to specification using a line-wrench-compatible crowfoot on a torque wrench. Torque banjo bolts (if used) per OEM specification — refer to Tesla Service Manual, as banjo torque is not listed in the verified torque table for this job.
    Torque spec

    Line Fittings20 Nm (15 lb-ft)
12. 12

    Refill reservoir and perform initial gravity bleed
    Fill the brake fluid reservoir to MAX with fresh, sealed DOT 3. Open each caliper bleeder in turn (typically RR, LR, RF, LF — verify sequence with the Tesla Service Manual for Cybertruck) and allow fluid to gravity-bleed until clean fluid free of large bubbles flows. Keep the reservoir topped up — never let it run dry.
    Torque spec

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

    Pressure bleed each caliper
    Connect a pressure bleeder to the reservoir at 15–20 psi (or use a vacuum bleeder at each caliper). Bleed each corner in the manufacturer-specified sequence until fluid runs clear with no air. Close each bleeder to the specified torque before moving to the next corner.
    ⚠Do not exceed the pressure bleeder's rated pressure or the reservoir cap seal can be damaged.
    Torque spec

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

    Perform scan-tool service bleed of iBooster/ABS unit
    Reconnect the 48V low-voltage battery and bring the vehicle out of Jack Mode only enough to power the brake controller (follow the scan tool's instructions). Connect a Tesla-compatible diagnostic scan tool and run the commanded brake system service bleed routine. This cycles the ABS solenoids and the iBooster to purge air from passages that cannot be reached by manual bleeding. Repeat the manual bleed at each corner after the commanded routine completes.
    ⚠️Skipping the commanded bleed will leave air in the ABS/iBooster and result in a long, soft pedal and degraded ABS performance — a safety-critical defect.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
15. 15

    Final fluid level and leak inspection
    Top reservoir to MAX with fresh DOT 3. With an assistant pressing the brake pedal firmly and holding, inspect every fitting (4 calipers, every chassis junction, ABS/iBooster ports) for weeping or seepage. Wipe each fitting dry and recheck after 2–3 firm pedal applications. Any wet fitting must be addressed before the vehicle is returned to service.

Reassembly

1. Reinstall all four wheels and torque lug nuts in a star pattern.
2. Lower the vehicle to the ground.
3. Exit Jack/Service mode via the touchscreen and allow the air suspension to self-level to normal ride height.
4. Confirm reservoir level at MAX with the vehicle level.
5. Reset the brake fluid service interval (2-year Tesla recommendation) in the service log.

Verification

• With the vehicle in Park and brake pedal pressed firmly, the pedal must be high and firm — no progressive sink under steady pressure for 30 seconds.
• Use the diagnostic scan tool to confirm no active or stored DTCs in the iBooster/ABS module after the bleed routine.
• At low speed (5–10 mph) in an empty area, perform several light then progressively firmer brake applications. Confirm no pulling, no ABS activation on dry pavement, and no warning lamps (ABS, brake, traction, stability).
• Inspect every fitting and flex hose one final time after the test drive while components are warm — leaks often appear only under temperature.
• Recheck reservoir level after test drive; top to MAX with DOT 3 if needed.
• Note: Tesla recommends brake fluid replacement every 2 years regardless of mileage — log this service date.
• Torque sequence note: the verified torque table flags caliper bracket and bleeder torque sequences with 'VERIFY SEQUENCE WITH SERVICE MANUAL' — confirm the current Cybertruck service bulletin sequence before final torque if any caliper or bracket was disturbed.

Related trouble codes on this vehicle

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