# NHTSA Engineering Analysis EA02036
> **ABS CORROSION EXTENDS STOPPING DIST** · Opened 2002-12-11 · Closed 2004-01-26
## Investigation
- **Action number:** EA02036
- **Type:** Engineering Analysis
- **Open date:** 2002-12-11
- **Close date:** 2004-01-26
- **Manufacturer:** FREIGHTLINER LLC
- **Affected makes:** FREIGHTLINER
- **Affected components:** SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP
- **Affected model years:** 1996, 1997, 1998, 1999, 2000, 2001, 2002
- **Affected (make, year) variants:** 9
## Summary

THE TONE RING TOOTH PROFILE OF AN UNCOATED HYDRAULIC DISC BRAKE DEGRADES AFTER EXPOSURE TO CORROSIVE ENVIRONMENTS.WHEN THE TONE RING TOOTH PROFILE HAS DEGRADED IN FREIGHTLINER VEHICLES, THE ABS WARNING LIGHT ILLUMINATES RELIABLY TO WARN THE OPERATOR TO HAVE THE ABS SYSTEM SERVICED.IN RESPONSE TO ODI'S INQUIRY, FREIGHTLINER HAS ISSUED INFORMATION TO ALL AFFECTED OWNERS THAT ALERTS OWNERS TO THE IMPORTANCE OF RESPONDING TO THE ILLUMINATED ABS WARNING LIGHT.FREIGHTLINER ADOPTED COATED ROTORS DURING 2002 (DATE VARIES BY MODEL). SINCE NEITHER ODI NOR FREIGHTLINER HAVE ACCURATE DATA TO FORECAST THE CORROSION RESISTANCE OF COATED ROTORS, ODI PLANS TO CONDUCT A FUTURE SURVEY AT FREIGHTLINER (IN 18-24 MONTHS) TO EVALUATE THE DURABILITY OF THE COATED ROTORS.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA02036)
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