Complete replacement of all hydraulic brake lines on a 2024 Tesla Cybertruck Cyberbeast. This 800V/48V platform uses conventional DOT 3 hydraulic brakes at the calipers, but routing passes near 48V harnesses and air suspension lines requiring care during removal.

Warnings

Tools required

Parts

• Complete brake line set (front and rear hard lines) × 1 — Tesla Cybertruck OEM brake line kit — verify by VIN
• Front flexible brake hoses × 2 — OEM Cybertruck front brake hose
• Rear flexible brake hoses × 2 — OEM Cybertruck rear brake hose
• Copper/aluminum sealing washers for banjo fittings (if applicable) × 8 — OEM-spec sealing washers
• Brake line retaining clips × 1 — OEM-spec chassis clips
• DOT 3 brake fluid (sealed container) × 2 — Tesla-approved DOT 3

Fluids

• DOT 3 Brake Fluid — 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. Disconnect the low-voltage battery. NOTE: Cybertruck uses a 48V architecture — confirm battery location and disconnect procedure in the Tesla Service Manual for this VIN before proceeding. Use insulated tools.
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. Enter Service Mode and activate Jack Mode / Transport Mode on the touchscreen BEFORE disconnecting low-voltage power, to disable air suspension self-leveling.
7. Loosen wheel lug nuts on all four wheels while tires are on the ground.
8. Lift the vehicle at the manufacturer-specified jack points using puck adapters; support on rated jack stands. Cybertruck curb weight exceeds 6,600 lb — use stands rated accordingly.
9. Remove all four wheels.
10. Cover painted/stainless surfaces near the master cylinder reservoir with absorbent material to catch fluid drips.
11. Have a helper available for the bleeding sequence, or pre-stage a power bleeder.

Procedure

1. 1

   Document existing line routing
   Photograph the routing of every brake line, every chassis clip, and every junction block before removing anything. The Cybertruck routes brake lines alongside 48V harnesses and air suspension lines — incorrect re-routing risks chafing and abrasion failures. Note clip positions and any heat-shield interfaces.
2. 2

   Drain master cylinder reservoir
   Using a clean syringe or fluid extractor, remove as much DOT 3 fluid as possible from the master cylinder reservoir to minimize spillage during line removal. Dispose per local hazardous waste rules. Do not allow the reservoir to run dry into the master cylinder bore unless the master is being replaced.
   ⚠DOT 3 fluid is hygroscopic. Use only fresh fluid from a sealed container for refill.
3. 3

   Remove front flexible brake hoses
   At each front caliper, place a catch pan beneath the fitting. Crack the caliper-end fitting first using a flare-nut wrench, then disconnect. At the chassis end, support the hard line with a backup wrench while loosening the flexible hose union. Remove the hose retaining clip at the strut/bracket. Repeat on the opposite side.
   ⚠Use a flare-nut wrench, not an open-end wrench, to avoid rounding the soft fitting.
4. 4

   Remove rear flexible brake hoses
   Repeat the procedure at each rear caliper. Note that on this air-suspension equipped truck, the rear hoses must allow full suspension travel — verify clip positions before removal. Cap caliper ports immediately.
5. 5

   Remove underbody protective panels as required
   Remove only those underbody panels needed to access the hard line routing along the frame rails. Use trim tools — do not pry against the stainless exoskeleton. Retain all fasteners.
6. 6

   Disconnect hard lines at master cylinder / ABS modulator
   Locate the brake hydraulic modulator (ABS/iBooster unit). Place absorbent material under all fittings. Loosen each hard line fitting using a flare-nut wrench while supporting the modulator port with a backup wrench. Label each line by circuit (LF, RF, LR, RR or primary/secondary) before removal.
   ⚠️Do not place strain on the modulator body or its electrical connectors. Replacement of the modulator requires Tesla Toolbox software for re-coding — STOP if the unit is disturbed.
7. 7

   Remove hard lines from chassis
   Working from one end, release each retaining clip and withdraw the hard lines. Note routing through any frame pass-throughs and grommets. Do not bend or kink replacement lines during removal of the originals — keep originals as a routing reference.
   ⚠Keep brake lines clear of orange HV cabling at all times. If routing requires close proximity, STOP and consult the service manual.
8. 8

   Install new hard lines
   Install the new hard lines following the original routing exactly. Seat all retaining clips and grommets. Hand-thread every fitting before applying any wrench torque to avoid cross-threading the soft flare seats. Maintain clearance from suspension components, exhaust-equivalent heat sources (e.g., HV battery cooling lines), and 48V harnesses.
9. 9

   Torque hard line fittings
   Tighten all hard line tube nuts at the modulator and at each junction. Torque to OEM specification — refer to Tesla Service Manual for the specific tube nut value (typical brake tube nuts are low-torque; do not overtighten or the flare will deform).
   ⚠Overtorquing flare fittings will deform the seat and cause permanent leaks.
10. 10

    Install new flexible hoses (front and rear)
    Install new flexible hoses at each corner. Use new sealing washers if banjo-style fittings are present. Ensure the hose is not twisted at full lock or full droop. Seat hose retaining clips fully. Connect to caliper and to chassis hard line.
11. 11

    Torque flexible hose fittings
    Torque hose-to-caliper banjo bolts or tube nuts, and hose-to-hardline unions, to OEM specification — refer to Tesla Service Manual. Verify the hose is not under torsional load after tightening.
12. 12

    Refill and bleed the brake system
    Fill the reservoir with fresh DOT 3 fluid to the MAX line. Using a power bleeder is strongly preferred on this vehicle because the iBooster-style hydraulic system may require Tesla service software to perform a full automated bleed of the modulator/booster internal circuits. For the wheel circuits, bleed in the manufacturer-specified sequence (typically furthest-from-master to closest). Open each bleeder, flush until clean fluid free of bubbles emerges, then close. Maintain reservoir level above MIN throughout.
    ⚠If the brake pedal remains soft after manual bleeding, the modulator/booster requires a service-tool-initiated bleed. STOP and have the vehicle bled by a Tesla-certified technician — do not road test with a soft pedal.
    Torque spec

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

    Pressure-test the system
    With the system bled, pressurize via firm pedal application (low-voltage battery still disconnected — pedal will feel firmer without booster assist, which is expected). Inspect every fitting, junction, and caliper port for weeping. Wipe each connection dry and re-inspect after 5 minutes.

Reassembly

1. Reinstall any underbody panels removed for access; torque fasteners to OEM specification — refer to Tesla Service Manual.
2. Top off the brake fluid reservoir to the MAX line with fresh DOT 3.
3. Reinstall all four wheels and snug lug nuts by hand.
4. Lower the vehicle to the ground.
5. Torque wheel lug nuts in a star pattern to specification.
6. Reconnect the low-voltage (48V) battery using insulated tools.
7. Exit Jack Mode / Service Mode via the touchscreen and allow the air suspension to self-level.
8. Cycle the vehicle on; observe for ABS, traction control, or brake warning lights on the instrument display.

Verification

• With the vehicle on, pump the brake pedal — pedal should be firm and high. A soft or sinking pedal indicates remaining air or a leak; do not road test.
• Check for any active warnings on the touchscreen related to the brake hydraulic system, ABS, or brake booster.
• Visually re-inspect every fitting after the first cycle of pedal application — booster pressure is much higher than manual pedal pressure and may reveal weeping joints.
• Perform a low-speed brake test in a controlled area: confirm straight-line stopping, no pulling, and ABS function on a low-traction surface if conditions allow.
• Re-check fluid level after the test drive and top off to MAX.
• Document this service: Tesla recommends brake fluid replacement every 2 years regardless of mileage. Set a reminder for the next interval.
• If the pedal feel remains unsatisfactory or the modulator was disturbed, have the system bled with Tesla service software by a certified technician — manual bleeding cannot fully purge the modulator's internal galleries.

More procedures for this vehicle