By Truck Parts & Service Staff
Recognize, Prevent Corrosion and Rust Jacking
When rust creeps in between the brake lining and shoe table, it can cause the lining to fracture, according to ArvinMeritor.
During normal braking, a brake lining will have miniscule movement from temperature cycling, brake torque and component deflections, relative to the shoe table. If the lining wears off the paint on the shoe table (a condition called micro-abrasion), the bare metal is exposed to road spray and grime. At that point, oxidation can begin to form as quickly as overnight.
Over the long term, layers of rust can build up between the brake shoe and the lining. Each layer puts more upward pressure on the lining, which is firmly riveted to the shoe. Eventually, the lining can crack.
Rust jacking looks different from surface cracks, edge de-lamination or fractures that happen when the lining is worn down to the rivet head.
The characteristics of rust-jacked shoes include:
Several factors influence this, including:
Paint is the brake shoe’s most basic level of protection from oxidation, according to ArvinMeritor.
