Brake Hose - Front

Replacement of a front brake hose on a 2024 Tesla Cybertruck Dual Motor. The hose connects the hard line to the front caliper; replacement requires brake fluid bleeding afterward. The Cybertruck uses DOT 3 brake fluid and has a 48V low-voltage architecture.

Warnings

Tools required

Parts

• Front brake hose assembly (manufacturer-specified for Cybertruck) × 1 — Tesla OEM front brake hose — verify by VIN
• Banjo bolt copper sealing washers (new) × 2 — OEM-spec copper crush washers, sized to banjo bolt

Fluids

• DOT 3 Brake Fluid — 1 qt

Preparation

1. Park on level ground, place in P, 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 48V low-voltage battery per Tesla service procedure (Cybertruck uses a 48V architecture, not 12V — connectors and disconnect points differ from S/3/X/Y).
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 / Jack Mode on the center touchscreen before disconnecting low-voltage power, so the air suspension is locked at ride height and will not actuate.
7. Loosen the front wheel lug nuts while the vehicle is on the ground, then raise the front of the truck at the manufacturer-specified jack points and support on rated jack stands.
8. Remove the front wheel on the side being serviced.
9. Place a drip pan beneath the caliper area; have shop towels ready for fluid containment.

Procedure

1. 1

   Inspect and clean the brake hose connections
   Wipe the banjo fitting at the caliper and the hard-line fitting at the upper hose end with brake parts cleaner so debris cannot enter the hydraulic system. Inspect the hose routing and note the orientation of any locating tabs or anti-rotation features before removal.
2. 2

   Minimize fluid loss
   Optionally clamp the flexible portion of the hose with a brake hose pinch-off tool to limit fluid loss, OR cap the master cylinder reservoir to reduce siphoning. Open the reservoir cap briefly to relieve any residual pressure, then re-cap.
   ⚠Do not pinch steel hard lines — only flexible rubber/braided hose sections.
3. 3

   Disconnect the hard line from the upper hose fitting
   Using a flare-nut/line wrench, loosen and disconnect the hydraulic hard line from the top of the brake hose. Catch dripping fluid in the drip pan. Cap or plug the open hard line immediately to prevent contamination and air ingress.
   ⚠Use a line wrench — open-end wrenches will round the soft fitting hex.
   Torque spec

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

   Release the hose from the chassis bracket
   Remove the retaining clip and any intermediate bracket fasteners securing the hose to the chassis bracket so the hose can be freed from its locating tab.
   Torque spec

   Brake Hose Bracket10 Nm (7 lb-ft)
5. 5

   Remove the banjo bolt at the caliper
   Position a drip pan under the caliper. Remove the banjo bolt securing the brake hose to the caliper. Discard both copper sealing washers — they MUST be replaced with new washers on reassembly. Cap the caliper port and the hose end to keep contaminants out.
   ⚠Copper crush washers are single-use. Reusing old washers will cause leaks.
   Torque spec

   Brake Hose Banjo Bolt25 Nm (18 lb-ft)
6. 6

   Remove the old hose
   Withdraw the hose from any remaining routing clips or grommets. Compare the old hose to the new replacement: length, end-fitting orientation, and locating tab position must match exactly.
7. 7

   Install the new brake hose at the caliper
   Place a new copper washer on each side of the banjo fitting (one between bolt head and fitting, one between fitting and caliper). Thread the banjo bolt by hand to avoid cross-threading, ensuring the hose's anti-rotation tab seats in its locator. Torque the banjo bolt to specification.
   ⚠Verify the hose does not twist as the banjo bolt is tightened; a twisted hose will fatigue and fail.
   Torque spec

   Brake Hose Banjo Bolt25 Nm (18 lb-ft)
8. 8

   Secure the hose to the chassis bracket
   Route the hose through the chassis bracket, install the retaining clip, and ensure the hose has no kinks or tension at full steering lock and full suspension travel. Torque any bracket hardware to specification.
   Torque spec

   Brake Hose Bracket10 Nm (7 lb-ft)
9. 9

   Reconnect the hard line to the upper hose fitting
   Thread the hard-line fitting into the upper end of the new hose by hand to avoid cross-threading. Tighten with a line wrench to specification.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
10. 10

    Bleed the affected brake circuit
    Top off the master cylinder reservoir with fresh DOT 3 brake fluid. Bleed the corner that was serviced via the caliper bleeder screw using a pressure or vacuum bleeder, or a two-person pedal-bleed method, until clear bubble-free fluid flows. Maintain reservoir level above MIN throughout. Torque the bleeder screw on closing.
    ⚠Use only fresh, sealed DOT 3. Do not substitute DOT 5 silicone fluid.
    ℹ️If air may have entered the ABS/iBooster module, a full system bleed using Tesla diagnostic tooling may be required to actuate the ABS valves.
    Torque spec

    Bleeder Screw14 Nm (10 lb-ft)

Reassembly

1. Verify reservoir is filled to MAX with fresh DOT 3 fluid and cap is secure.
2. Check for leaks at the banjo fitting and the upper line fitting by having an assistant apply firm pedal pressure while you inspect each joint.
3. Reinstall the front wheel. Snug lug nuts by hand, then lower the vehicle to the ground.
4. Torque the wheel lug nuts in a star pattern to specification.
5. Reconnect the 48V low-voltage battery.
6. Exit Service/Jack Mode via the touchscreen and allow the air suspension to re-level.

Verification

• With the vehicle stationary and brakes pumped to a firm pedal, inspect both ends of the new hose for any seepage after 5 minutes.
• Check the touchscreen for any brake-system or ABS warnings; clear or address as needed before driving.
• Cycle the steering yoke lock-to-lock (steer-by-wire — must have low-voltage system online) and confirm hose has no contact, kinks, or stretch through full travel.
• Perform a low-speed brake test in a safe area: confirm firm pedal, straight braking, and no warning lights.
• Per Tesla's published recommendation, brake fluid should be replaced every 2 years regardless of mileage — record this service date.
• After a short test drive, re-check the banjo and line fittings for any weep and re-verify reservoir level.

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