Brake Hose - Rear

Replacement of a rear brake hose on a 2024 Tesla Cybertruck Cyberbeast. The hose connects the hard line at the chassis to the rear caliper; replacement requires brake fluid bleeding afterward.

Warnings

Tools required

Parts

• Rear brake hose assembly (manufacturer-specified for Cybertruck Tri Motor) × 1 — OEM Tesla rear brake hose — refer to Tesla EPC
• Copper sealing washers for banjo fitting × 2 — New copper crush washers, banjo bolt size — quantity per side as required (typically 2)
• Retaining clip for hard-line-to-hose junction (if equipped) × 1 — OEM horseshoe / U-clip

Fluids

• DOT 3 Brake Fluid (Tesla specification) — 1 qt

Preparation

1. Park on level ground, place in P, engage the parking brake.
2. Exit ALL doors with the key fob/phone key 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 LV architecture (not 12V) — confirm location and connector type per Tesla service documentation before disconnecting.
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. Activate Jack Mode via the touchscreen before raising to disable air suspension self-leveling (perform before LV disconnect, then disconnect LV).
7. Loosen rear wheel lug nuts while the vehicle is on the ground.
8. Raise the rear of the vehicle at the manufacturer-specified lift points using Tesla-approved pad adapters; support on rated jack stands.
9. Remove the rear wheel on the affected side.
10. Have a catch pan, rags, and line caps ready before opening any hydraulic fitting.

Procedure

1. 1

   Minimize fluid loss at the master cylinder
   Open the brake fluid reservoir cap briefly to confirm fluid level, then reseal. Optionally place a brake pedal depressor or use a vacuum cap technique per Tesla service procedure to limit gravity drain during hose replacement.
2. 2

   Position catch pan and identify hose routing
   Locate the rear brake hose: it runs from a hard-line junction on the chassis/subframe to the rear caliper. Note the routing, the bracket(s) securing the hose mid-span, and the orientation of the banjo fitting at the caliper. Photograph for reference.
3. 3

   Disconnect hose at the chassis hard-line junction
   Using a flare-nut wrench on the hard-line fitting and an open-end wrench on the hose hex, loosen the tube nut. Remove the retaining U-clip securing the hose to the chassis bracket, then separate the hose from the hard line. Cap both openings immediately.
   ⚠Use a flare-nut wrench to avoid rounding the soft hard-line fitting.
4. 4

   Release intermediate hose bracket(s)
   Remove the fastener(s) securing the brake hose bracket to the suspension/subframe. Retain hardware. Note clip orientation for reinstallation.
   Torque spec

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

   Disconnect hose at the caliper (banjo fitting)
   Place the catch pan beneath the caliper. Remove the banjo bolt at the caliper inlet and discard the two copper sealing washers. Remove the hose from the vehicle. Cap the caliper port.
   ⚠Always discard and replace the copper washers — reuse will cause leaks.
   Torque spec

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

   Inspect mating surfaces
   Inspect the caliper banjo seat and chassis hard-line flare for corrosion, debris, or damage. Clean with a lint-free cloth. Verify the new hose part number matches the OEM specification for the Cybertruck rear axle.
7. 7

   Install new 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, then torque to specification. Verify hose orientation is not twisted and clears suspension travel.
   ⚠Verify torque sequence and final torque against the Tesla Service Manual — banjo bolt torque is critical for sealing.
   Torque spec

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

   Route hose and secure intermediate bracket(s)
   Route the hose along the original path. Seat the hose into its bracket(s) and install the retaining hardware. Torque the bracket fastener(s) to specification.
   Torque spec

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

   Connect hose to chassis hard line
   Engage the hard-line tube nut into the hose fitting by hand to avoid cross-threading. Tighten using a flare-nut wrench while holding the hose hex with an open-end wrench. Torque to OEM specification — refer to Tesla Service Manual. Reinstall the U-clip to lock the fitting in the chassis bracket.
   ⚠The U-clip must be fully seated — it prevents the fitting from backing out under pressure.
10. 10

    Verify suspension-travel clearance
    With the vehicle still raised, cycle the suspension/steering knuckle through its range manually to confirm the hose does not contact tire, suspension, or chassis at any point and is not twisted.
11. 11

    Bleed the affected rear caliper
    Top off the master cylinder reservoir with fresh DOT 3 brake fluid. Attach a clear hose to the caliper bleeder screw with the end submerged in fresh fluid in a catch bottle. Open the bleeder, apply pressure (pedal, vacuum, or pressure bleeder), and bleed until clean fluid free of air bubbles emerges. Close the bleeder and torque to specification. Top off the reservoir. If significant fluid was lost, perform a full system bleed per Tesla service procedure.
    ⚠Do not allow the master cylinder reservoir to run dry during bleeding — this will introduce air into the ABS/iBooster module and may require a Tesla Toolbox-assisted bleed (out of scope for DIY).
    Torque spec

    Bleeder Screw14 Nm (10 lb-ft)
12. 12

    Leak check under pressure
    With bleeding complete and reservoir topped to MAX, have an assistant apply firm pedal pressure (approx. 30 seconds) while you inspect the banjo fitting, hard-line junction, and bleeder for any seepage. Repeat 2–3 times.

Reassembly

1. Reinstall the rear wheel; hand-thread lug nuts to prevent cross-threading.
2. Lower the vehicle until the tire contacts the ground, then torque lug nuts to specification in a star pattern.
3. Fully lower the vehicle and remove jack stands.
4. Reconnect the 48V low-voltage battery using insulated tools; secure all covers.
5. Close the brake fluid reservoir cap and verify fluid is at MAX, cold.

Verification

• Exit Jack Mode via the touchscreen and allow the air suspension to self-level; verify no fault messages appear.
• With the vehicle stationary and brake pedal pressed, confirm pedal feels firm and does not slowly sink under steady pressure (indicates a leak or air).
• Check the touchscreen for any ABS, brake, or stability control warnings — Cybertruck's brake-by-wire-influenced systems will flag a soft pedal or pressure sensor anomaly.
• Perform a low-speed brake test in a safe area (5–10 mph), checking for straight stopping and no pulling.
• Inspect the banjo and hard-line fittings again after the test drive for any weeping.
• Recheck rear lug nut torque after 50–100 miles (Wheel Lug Nuts spec).
• NOTE: Tesla recommends complete brake fluid replacement every 2 years regardless of mileage. If the fluid is approaching that interval, perform a full system flush now while the system is open.
• torqueRefs
• Bracket Bolts and Caliper Bolts torques are listed for reference if calipers or caliper brackets were disturbed during this procedure.

Related trouble codes on this vehicle

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