From the Dexter Axle website at:
http://dexteraxle.com/running_gear_info/faqs.php#38
"Why did my brake spring break?
Late in 1997, Dexter Axle recognized a reoccuring problem with our adjuster spring and decided that we needed to change the spring manufacturer to solve the problem. It is most common to find the defective spring in a trailer axle produced between 1995-97 in the 3,000 lb. to 7,200 lb. capacity range, but any adjuster spring that is LIGHT BLUE in color may be suspect. Dexter's new spring in dark red in color and is a direct replacment for the blue spring. If a trailer is found to have blue adjuster springs or has failed springs, Dexter would be glad to help a trailer owner correct this problem... . "
http://dexteraxle.com/running_gear_info/faqs.php#38
"Why did my brake spring break?
Late in 1997, Dexter Axle recognized a reoccuring problem with our adjuster spring and decided that we needed to change the spring manufacturer to solve the problem. It is most common to find the defective spring in a trailer axle produced between 1995-97 in the 3,000 lb. to 7,200 lb. capacity range, but any adjuster spring that is LIGHT BLUE in color may be suspect. Dexter's new spring in dark red in color and is a direct replacment for the blue spring. If a trailer is found to have blue adjuster springs or has failed springs, Dexter would be glad to help a trailer owner correct this problem... . "