Fras-le highlights key maintenance practices for brake drum longevity

CV braking supplier, Fras-le, is offering guidance on how to address some common brake drum issues such as heat checks and martensite spotting.

Heat checking appears as fine, hairline cracks on the braking surface and is caused by the normal heating and cooling process during braking. While typically not problematic, if these cracks grow into larger ones, the brake drum must be replaced, warns Fras-le.

Martensite spotting is another concern, and is visible as dark, raised spots on the drum’s surface.

This occurs when the drum is subjected to extremely high temperatures, which can change the material's structure and make it more vulnerable to cracking. Both the drum and the brake linings should be replaced in this case, and the cause of the overheating must be addressed.

Blued brake drums, often caused by repeated hard stops, brake system imbalance or faulty return springs, can also be an issue. While these drums may not require immediate replacement, the brake system should be checked for balance and return springs should be inspected for wear or damage, advises Fras-le. If left unresolved, this condition can lead to more serious problems such as cracking.

Broken mounting rings, caused by improper drum installation or hub issues, must also be addressed immediately. The hub should be checked for defects and cleaned or replaced if necessary, and the drum must be replaced if any cracks are found, advises the braking supplier.