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Self-tests 2026 firmware

DPB Corner Stiffness Test

Gen3/tasks/TEST-SELF_BRAKE_X_DPB-ESP-CORNER-STIFFNESS-TEST

What this task does

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.

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
Supported connection
Remote access
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Procedure notes

Will release parking brakes one at a time. The vehicle may shift! Make sure the vehicle is on a flat surface or a lift, and surrounding area is safe.

Task inputs (7)

ROUTINE_PARAMETERS

ROUTINE_PARAMETERS · Dict

Input parameters for the DPB UDS routine

Firmware default: Not specified

AXLE_STROKE_LIMITS

AXLE_STROKE_LIMITS · Dict

Stroke limits threshold for each axle to ensure that there is no air in the system

Firmware default: Not specified

PLUNGER_LEAKAGE_DELTA

PLUNGER_LEAKAGE_DELTA · Float

Stroke threshold to ensure that there is no leakage in the system

Firmware default: Not specified

PRESSURE_LEAKAGE_DELTA

PRESSURE_LEAKAGE_DELTA · Float

Threshold to ensure that there is no leakage in the system

Firmware default: Not specified

STROKE_PERC_DIFF_LIMITS

STROKE_PERC_DIFF_LIMITS · List

Percentage diff limits for plunger stroke to ensure that both sides of each axle has a similar stiffness

Firmware default: Not specified

PRESSURE_PERC_DIFF_LIMITS

PRESSURE_PERC_DIFF_LIMITS · List

Percentage diff limits for plunger pressure to ensure that both sides of each axle has a similar stiffness

Firmware default: Not specified

PRESSURE_LEAKAGE_DELTA_CRITICAL

PRESSURE_LEAKAGE_DELTA_CRITICAL · Bool

If pressure leakage delta exceed threshold will fail the routine

Firmware default: Not specified

Browse all tasks →
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 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 - Pressure

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.

TEST_BRAKE_X_STIFFNESS-TEST-PRESSURE-BURNISHED

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+)