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.
2004 Chevrolet Optra Base, StandardFACTORY OEM SERVICE PROCEDURE
ABS Component Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Antilock Brake System (ABS) Main Relay Operation Voltage | 9-16 V | |
| Antilock Brake System (ABS) Mode | 4 Channel 4 Sensor | |
| Speed Ring | ||
|
61.9 mm | 2.4370 in |
|
28.1 mm | 1.1063 in |
|
70.4 mm | 2.7716 in |
|
41.13 mm | 1.6192 in |
|
47 EA | |
| Wheel Speed Sensor - Resistance | 1,040-1,160 Ξ© | |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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