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Diagnostic tests 2026 firmware

IBST Stiffness Test - Burnished/Unburnished

Gen3/tasks/TEST_BRAKE_X_STIFFNESS-TEST-SERVICE

What this task does

Measures the brake system stiffness. Select burnished or unburnished to determine the pass/fail threshold. Stiffness threshold is selected based on chassis and brake hardware type. Stiffness by wheel circuit is also measured, but not used for pass/fail.

Vehicle & firmware coverage

Open a version to see its description, requirements, and input definitions. Hardware configuration and live vehicle checks also determine availability.

Model 3 / Y AMD · Firmware 2026.32.3
Vehicle coverage
2024+ Model 3, Model Y, Pre-2024 Model 3
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
Factory, Service, DiagLinkActive

Task inputs (1)

Action_Type

ActionType · String

Run brake stiffness test on burnished or unburnished brake system

Firmware default: BURNISHED

Options: UNBURNISHED, BURNISHED

Model 3 / Y Intel · Firmware 2026.32.7
Vehicle coverage
Model Y, Pre-2024 Model 3
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
Factory, Service, DiagLinkActive

Task inputs (1)

Action_Type

ActionType · String

Run brake stiffness test on burnished or unburnished brake system

Firmware default: BURNISHED

Options: UNBURNISHED, BURNISHED

Model S / X (2021+) AMD · Firmware 2026.20.6.1
Vehicle coverage
2021+ Model S, 2021+ Model X
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
Factory, Service, DiagLinkActive

Task inputs (1)

Action_Type

ActionType · String

Run brake stiffness test on burnished or unburnished brake system

Firmware default: BURNISHED

Options: UNBURNISHED, BURNISHED

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Service procedures

Carbon Ceramic Brakes Configuration Update

Updates the following GTW configurations brakeHwType->0x0A, epblHwType->0x07, and epbrHwType->0x07. Clears and relearns HW type on EPBL and EPBR. Triggers a service firmware redeploy.

PROC_BRAKE_X_CARBON-BRAKES-CONFIG-UPDATE

Model S / X (2021+)
Service procedures

Carbon Ceramic Brakes Uninstall - Configuration Reset

Updates the following GTW configurations brakeHwType->0x0B, epblHwType->0x06, and epbrHwType->0x06. Clears and relearns HW type on EPBL and EPBR. Triggers a service firmware redeploy.

PROC_BRAKE_X_CARBON-BRAKES-CONFIG-RESET

Model S / X (2021+)
Self-tests

DPB Brake System Stiffness Test

Validates all 4 brake lines by measuring DPB plunger stroke values and validating that none are blocked, have air or leakage

TEST-SELF_BRAKE_X_DPB-ESP-SYSTEM-CHECK

Model 3 / Y
Self-tests

DPB Corner Stiffness Test

Applies pressure to each individual corner in turn to compare the output values and validate the brakes. If executing with DIAG_LINK_ACTIVE then EPBs will release one at a time, which is required if CHECK_SWAPPED_REAR_LINES is true.

TEST-SELF_BRAKE_X_DPB-ESP-CORNER-STIFFNESS-TEST

Model 3 / Y