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Diagnostic tests 2026 firmware

IBST Stiffness Test - Burnished - Pressure

ModelY/tasks/TEST_BRAKE_X_STIFFNESS-TEST-PRESSURE-BURNISHED

What this task does

Measures the brake system stiffness of burnished brakes and tests the brake pedal switch. Stiffness threshold is selected based on chassis and brake hardware type.

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
2025+ Model Y, Model Y
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Task inputs (4)

MEASURE_STROKE_LEAKAGE_PHASE

MEASURE_STROKE_LEAKAGE_PHASE · Float

Firmware default: Not specified

PRESSURE_LEAKAGE_THRESH

PRESSURE_LEAKAGE_THRESH · Float

Firmware default: Not specified

RUN_PRE_EVAC

RUN_PRE_EVAC · Bool

Firmware default: Not specified

TOTAL_PROC_SEC

TOTAL_PROC_SEC · Float

Firmware default: Not specified

Model 3 / Y Intel · Firmware 2026.32.7
Vehicle coverage
Model Y
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Task inputs (4)

MEASURE_STROKE_LEAKAGE_PHASE

MEASURE_STROKE_LEAKAGE_PHASE · Float

Firmware default: Not specified

PRESSURE_LEAKAGE_THRESH

PRESSURE_LEAKAGE_THRESH · Float

Firmware default: Not specified

RUN_PRE_EVAC

RUN_PRE_EVAC · Bool

Firmware default: Not specified

TOTAL_PROC_SEC

TOTAL_PROC_SEC · Float

Firmware default: Not specified

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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
Self-tests

DPB Swapped Rear Lines Check

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-CHECK-REAR-CROSSED-LINES

Model 3 / Y
Diagnostic tests

IBST Stiffness Test - Burnished/Unburnished

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.

TEST_BRAKE_X_STIFFNESS-TEST-SERVICE

Model 3 / Y Model S / X (2021+)