Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code A041 - Right Front ESB Will Not Hold Motor: Notes
This test is designed to detect slipping left front Expansion Spring Brake (ESB). During initialization and braking, left front motor is re-homed (EMB piston is moved to its upmost position and check valve lifted off its seat). If ESB slips, motor/piston will move. During next key-on initialization, a re-home of motor verifies motor/piston remained at home (upmost) position. If motor movement is detected, ESB is slipping.
- This step checks for a broken or defective ESB. This causes right front piston to be back driven by hydraulic pressure, resulting in pedal movement.
- This step releases motor pack tension before removal.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.