C0089
ChassisBrake Systemhigh severityBrake Fluid Level Low
What C0089 Means
The brake fluid level sensor confirms fluid is below the minimum acceptable level.
Symptoms
- Brake warning light on
- Low fluid warning on dash
- ABS may be disabled
- Brake pedal lower than normal
Common Causes
- Worn brake pads consuming fluid in calipers
- Brake fluid leak at caliper or hose
- Master cylinder internal leak
- Wheel cylinder leak on drum brakes
Diagnostic Steps
- Check brake fluid level visually
- Inspect all four wheels for brake fluid leaks
- Check all brake hoses and lines
- Inspect master cylinder for leaks
- Measure brake pad thickness
Where to start: Find and repair the leak source. Fill fluid and bleed system. Do not just add fluid without finding the cause.
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