# NHTSA Engineering Analysis EA89033
> **DRUM BRAKE SYSTEM** · Opened 1989-08-21 · Closed 1990-02-08
## Investigation
- **Action number:** EA89033
- **Type:** Engineering Analysis
- **Open date:** 1989-08-21
- **Close date:** 1990-02-08
- **Manufacturer:** ATHEY PRODUCTS CORP.
- **Affected makes:** ATHEY
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989
- **Affected (make, year) variants:** 22
## Summary

SUMMARY:ATHEY PUBLISHED A SERVICE BULLETIN AND SUPPLEMENT DESCRIBING ADRUM TO DISC BRAKE CONVERSION.A CHECK OF THE ODI DATA BASE REVEALED AFLEET COMPLAINT PERTAINING TO FOUR UNITS.REOCCURRING PROBLEMS SUCH ASLEAKING WHEEL CYLINDERS, PREMATURELY WORN BRAKE SHOES, AND BROKEN WHEELCYLINDER PUSH RODS WERE DESCRIBED.AN IR TO ATHEY RESULTED IN ANUNSATISFACTORY RESPONSE.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA89033)
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