Complete replacement of all hydraulic brake lines on the 2024 Tesla Roadster (Tri Motor AWD). Note: this vehicle's chassis architecture is not well-documented publicly; the procedure below uses generic best-practice language where Tesla-specific details are not verified.

Warnings

Tools required

Parts

• Complete brake line set (hard lines and flexible hoses, front and rear) × 1 — Manufacturer-specified OEM brake line set for 2024 Roadster — confirm with Tesla Service
• Brake line fitting washers/seals (as required by line set) × 1 — OEM specification
• Replacement brake fluid × 1 — DOT 3 (per verified spec)

Fluids

• DOT 3 Brake Fluid — 2 qt

Preparation

1. Park on level ground, place in P, engage parking brake.
2. Exit ALL doors with 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 12V (or 16V/48V on applicable models) low-voltage battery per Tesla service documentation for the Roadster — see architecture notes; location is not publicly verified.
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. Chock wheels, loosen lug nuts on all four wheels while on the ground, then raise vehicle on a lift or jack stands rated for the Roadster's curb weight using manufacturer-specified lift points.
7. Remove all four wheels for full access to calipers and line routing.
8. Lay out the new brake line set and compare each line to its original counterpart before removal — pre-bend hard lines if supplied straight.
9. Cover the brake fluid reservoir cap area and surrounding bodywork with absorbent shop towels.

Procedure

1. 1

   Drain the brake fluid reservoir
   Using a clean syringe or fluid extractor, remove as much brake fluid as possible from the master cylinder reservoir to minimize spillage when lines are opened. Do not let the reservoir pickup run completely dry if the system will be re-pressurized later.
   ⚠Used brake fluid is hygroscopic and contaminated — dispose of per local regulations.
2. 2

   Document existing line routing
   Photograph each brake line run, every retaining clip, P-clamp, and grommet location before removing anything. Note which lines pass behind subframe members or HV component shields. This documentation is critical given the limited public service info for this vehicle.
3. 3

   Disconnect flexible hoses at each caliper
   At each caliper (front and rear), use a line wrench to loosen the banjo bolt or threaded fitting connecting the flexible hose. Catch fluid in a container. Cap the caliper port immediately to prevent contamination.
   ⚠Use a flare-nut/line wrench only — open-end wrenches will round the soft fitting hex.
   Torque spec

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

   Disconnect flexible hoses at chassis brackets
   At each chassis-side bracket, hold the hose hex with one wrench while loosening the hard-line fitting with a line wrench. Remove the retaining clip securing the hose to the bracket, then separate the hose. Repeat for all four corners.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
5. 5

   Disconnect hard lines at master cylinder / ABS modulator
   Locate the master cylinder and ABS/stability control hydraulic block. Using a line wrench, carefully loosen each hard-line fitting. Label each line with its port location before removal. Cap each port immediately.
   ⚠ABS modulator fittings are easily cross-threaded. Start every fitting by hand.
   ⚠️If the modulator assembly is integrated with HV-adjacent wiring or you observe orange cabling near the unit, STOP and consult a Tesla-certified technician.
   Torque spec

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

   Remove old hard lines from chassis
   Working systematically from front to rear, release each P-clip and retainer along the chassis. Withdraw the old hard lines, taking care not to scrape against painted or composite chassis surfaces.
   ⚠Do not pry against composite body panels or HV component covers. Use only chassis hardpoints.
7. 7

   Install new hard lines along original routing
   Route each new hard line exactly as documented in Step 2. Hand-start every fitting at the master cylinder, ABS block, and chassis brackets before tightening. Reinstall every P-clip and retainer to prevent vibration fatigue.
   ⚠Ensure adequate clearance from suspension arms at full droop and full bump, and from any orange HV cabling routing.
8. 8

   Torque hard-line fittings
   With every fitting hand-tight and lines properly clipped, torque all hard-line fittings at the master cylinder, ABS block, and chassis-to-flex-hose junctions to specification using a line-wrench-style crowfoot adapter as needed.
   Torque spec

   Line Fittings20 Nm (15 lb-ft)
9. 9

   Install new flexible hoses
   Install each new flexible hose at the chassis bracket first, securing with the retaining clip. Connect the caliper end, ensuring the hose is not twisted and does not contact the tire, suspension, or wheel well at any point in the steering or suspension travel.
   ⚠A twisted flex hose will fail prematurely. Verify orientation marks on the hose if present.
   Torque spec

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

    Torque flexible hose fittings
    Torque both ends of each flexible hose to specification. Replace any sealing washers with new ones supplied with the line set.
    Torque spec

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

    Refill reservoir and bleed the system
    Fill the master cylinder reservoir with fresh DOT 3 brake fluid. Bleed each caliper using a pressure or vacuum bleeder until clean, bubble-free fluid flows. Follow the bleed sequence specified in the Tesla Service Manual for this vehicle — sequence is not publicly verified, so do not assume a generic FR/FL/RR/RL order.
    ⚠Keep the reservoir topped up throughout bleeding. Running it dry forces a re-bleed of the entire system including the ABS modulator, which may require Tesla diagnostic software.
    ℹ️If air remains trapped in the ABS modulator after manual bleeding, an active modulator bleed via Tesla service tooling may be required.
    Torque spec

    Bleeder Screw10 Nm (7 lb-ft)
12. 12

    Pressure-test the system
    With reservoir topped to the MAX line, have an assistant apply firm and steady pedal pressure for 30 seconds. Inspect every fitting and hose for weeping. Re-torque or re-seat any fitting that shows fluid, then re-bleed that corner.

Reassembly

1. Reinstall all four wheels and torque lug nuts in a star pattern to specification.
2. Lower the vehicle to the ground.
3. Reconnect the low-voltage battery in the order specified by Tesla service documentation.
4. Top off the brake fluid reservoir to the MAX line with fresh DOT 3.
5. Clean any spilled brake fluid from chassis, calipers, and bodywork with brake cleaner and water.
6. Wake the vehicle and clear any chassis/ABS fault codes that set during the repair (Tesla service tooling may be required).

Verification

• With the vehicle stationary, pump the brake pedal — it should be firm within 1-2 strokes with no sponginess.
• Hold steady pedal pressure for 60 seconds; the pedal must not sink. A sinking pedal indicates an internal master cylinder leak or remaining external leak.
• Inspect every fitting and the area beneath each caliper after pedal application — no weeping or drips permitted.
• Confirm no ABS, traction control, or stability control warnings are active on the instrument display after a short test drive.
• At low speed (5-10 mph) in a safe area, perform progressive brake applications to confirm normal pedal feel and straight-line stopping.
• Perform a brief road test up to moderate speed and verify ABS self-test completes without faults.
• Log the service date — Tesla recommends brake fluid replacement every 2 years regardless of mileage; the next interval starts now.

More procedures for this vehicle