Brake Hose - Rear

Replacement of a rear brake hose on a 2024 Tesla Cybertruck Dual Motor. The hose connects the hard line at the chassis to the rear caliper; this job requires bleeding the rear brake circuit afterward.

Warnings

Tools required

Parts

• Rear brake hose, manufacturer-specified for Cybertruck (LH or RH as applicable) × 1 — Refer to Tesla EPC for the correct rear-side-specific hose
• Copper sealing washers for banjo fitting × 2 — OEM-spec crush washers, sized to banjo bolt
• Brake hose retaining clip (chassis-side) × 1 — Manufacturer-specified spring clip

Fluids

• DOT 3 Brake Fluid — 1 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 48V low-voltage battery per Tesla service procedure. Note: this is a 48V system, not 12V — use 48V-rated tooling and follow architecture-specific isolation steps.
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. Before powering down, set the air suspension to Jack Mode via the touchscreen (Service menu) so the vehicle does not self-level on jack stands.
7. Confirm wheels are pointing straight before LV power-down (steer-by-wire — no mechanical linkage).
8. Loosen the rear lug nuts slightly while the vehicle is on the ground.
9. Raise the rear of the vehicle and support on jack stands rated for Cybertruck weight at the manufacturer-specified lift points.
10. Remove the rear wheel(s) on the affected side.

Procedure

1. 1

   Inspect and stage the work area
   With the wheel removed, locate the rear brake hose running from the chassis hard line down to the caliper. Identify the chassis-side hard-line fitting, the intermediate bracket(s) securing the hose to the suspension/chassis, and the banjo bolt at the caliper. Place a catch pan under the work area to capture brake fluid.
2. 2

   Minimize fluid loss
   Optionally clamp the rubber section of the hose with a rubber-jawed brake hose pinch-off tool to limit fluid loss from the master cylinder reservoir. Do NOT clamp on any metal hard-line section. Alternatively, top off the reservoir and cap it tightly to slow gravity drain.
   ⚠Do not allow the master cylinder reservoir to run dry — it will introduce air into the ABS/booster module and complicate bleeding.
3. 3

   Disconnect the hard line at the chassis end
   Using a flare-nut (line) wrench, carefully crack the hard-line fitting where it threads into the chassis end of the brake hose. Back the fitting off slowly to allow controlled drainage into the catch pan. Take care not to round the fitting — these are typically soft steel.
   ⚠Always use a line wrench, never an open-end wrench, on hydraulic fittings to prevent rounding.
   Torque spec

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

   Remove the chassis-side retaining clip
   Slide the spring/horseshoe retaining clip out of the brake hose's chassis-side bracket. The hose end can then be pulled free from the bracket. Inspect the clip; replace if bent or corroded.
5. 5

   Remove intermediate hose bracket(s)
   Free the hose from any intermediate retaining bracket(s) along the suspension/subframe routing. These are typically held by a small bolt into the chassis. Note routing for reinstallation — incorrect routing can cause the hose to chafe or stretch during suspension travel.
   Torque spec

   Brake Hose Bracket10 Nm (7 lb-ft)
6. 6

   Remove banjo bolt at caliper
   Place the catch pan under the caliper. Using the correct-size socket or wrench, remove the banjo bolt at the rear caliper. Discard the two copper sealing washers — these MUST be replaced. Allow remaining fluid to drain.
   ⚠Copper crush washers are single-use. Reusing them will cause a fluid leak.
   Torque spec

   Brake Hose Banjo Bolt25 Nm (18 lb-ft)
7. 7

   Remove the old hose
   Withdraw the old brake hose from the vehicle, noting any orientation tabs or anti-rotation features at the bracket ends. Compare the new hose against the old one for length, fitting type, and bracket orientation before installation.
8. 8

   Install new hose at caliper
   Position the new hose at the caliper with a NEW copper sealing washer on each side of the banjo fitting (one between bolt head and hose, one between hose and caliper). Hand-thread the banjo bolt, then torque to spec. Verify the hose orientation is correct and not twisted.
   ⚠A twisted hose will fail prematurely. The hose should follow a natural arc through full suspension travel.
   Torque spec

   Brake Hose Banjo Bolt25 Nm (18 lb-ft)
9. 9

   Secure intermediate brackets
   Route the new hose along the original path and secure to all intermediate brackets. Torque the hose bracket bolt(s) to spec. Verify the hose does not contact any moving suspension component, the tire, or the body at any point in steering/suspension travel.
   Torque spec

   Brake Hose Bracket10 Nm (7 lb-ft)
10. 10

    Reconnect chassis hard line
    Seat the chassis-side end of the hose into its bracket and install the retaining clip fully. Confirm the hose end cannot move axially. Thread the hard-line fitting into the hose by hand to avoid cross-threading, then torque using a line wrench.
    ⚠Install the retaining clip BEFORE torquing the hard-line fitting, otherwise the hose can rotate and the fitting may not seal.
    Torque spec

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

    Bleed the rear brake circuit
    Top off the master cylinder reservoir with fresh DOT 3 brake fluid. Bleed the affected rear caliper using the bleeder screw until clean, air-free fluid flows. Tesla brake bleeding on Cybertruck typically requires Toolbox-initiated ABS module bleeding for a complete service; if Toolbox is unavailable and pedal feel is firm after a manual bleed, continue and verify thoroughly. If pedal feel remains spongy, ABS-assisted bleed via Toolbox is required. Torque the bleeder screw after bleeding.
    ⚠Never let the reservoir run dry during bleeding. Top off frequently.
    ℹ️A complete ABS/booster bleed on Cybertruck likely requires Tesla Toolbox. If pedal is not firm after a conventional bleed, do not return the vehicle to service.
    Torque spec

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

    Reinstall wheel
    Mount the wheel and hand-thread the lug nuts. Lower the vehicle until the tire just contacts the ground, then torque the lug nuts in a star pattern.
    Torque spec

    Wheel Lug Nuts136 Nm (100 lb-ft)

Reassembly

1. Confirm the master cylinder reservoir is filled to the MAX line with fresh DOT 3 brake fluid.
2. Reconnect the 48V low-voltage battery following Tesla procedure.
3. Exit Jack Mode via the touchscreen and allow the air suspension to return to normal ride height.
4. Wake the vehicle and clear any chassis/ABS faults that may have set during LV disconnect.
5. With engine power on and foot off the pedal, observe that the brake warning lamp extinguishes.
6. Pump the brake pedal multiple times until firm before any vehicle movement.

Verification

• Pedal feel: firm and consistent. Spongy pedal indicates trapped air — re-bleed (likely requires Tesla Toolbox ABS bleed).
• Visually inspect the new hose, banjo fitting, and hard-line fitting for any seepage after multiple firm pedal applications and after a short low-speed road test.
• Cycle the suspension through full travel (with vehicle safely supported or by entering/exiting Jack Mode) and verify the hose does not contact any moving component, the tire, or the body.
• Perform a low-speed brake test in a safe area — confirm straight, even braking with no pull and no ABS warning lights on the touchscreen.
• Check brake fluid level after the test drive and top off as needed.
• Reminder: Tesla recommends full brake fluid replacement every 2 years regardless of mileage. Log the date if a full flush was performed during this service.

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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