CONTRIBUTED INDUSTRY SERIES
The following is the fourth of a multi-part contributed series from NRS Brakes: a NUCAP company examining the role of the steel backing plate in brake pad durability. The technical positions expressed are the author’s. The BRAKE Report publishes contributed perspectives from across the brake and friction industry and welcomes responses from other manufacturers.
Catch up: Introduction | Part One | Part Two | Part Three
By NRS Brakes: a NUCAP company
Disclosure: NRS Brakes is a sponsor of The BRAKE Report. This series was contributed as editorial and was not paid placement.
Corrosion is frequently discussed as an appearance issue.
In reality, corrosion is a functional issue.
When steel corrodes, dimensions change. Surfaces expand. Clearances disappear. Load paths are altered.
For brake pads, those changes can directly affect performance.
The reason is straightforward:
The steel must outlast the friction for the entire life of the brake pad.
Brake pads are precision components operating within tightly controlled clearances. Small dimensional changes can influence installation, movement, wear patterns, and braking consistency.
As corrosion develops, the backing plate can experience:
• Rust jacking beneath friction material
• Abutment swelling
• Reduced bracket clearance
• Increased drag
• Binding
• Noise generation
• Uneven wear patterns
• Shim retention issues
These are not cosmetic concerns.
They are functional consequences of a steel component no longer behaving as originally designed.
The challenge is becoming increasingly important in modern vehicles, especially EVs and hybrids. Reduced brake usage can allow moisture and corrosion to remain active for longer periods without the heat cycles that traditionally help clean braking surfaces.
A brake pad should remain dimensionally stable and structurally sound from installation until replacement.
The friction should determine replacement timing—not corrosion.
When corrosion dictates the service life of the brake pad, the steel has failed its primary responsibility.
The steel should outlive the friction.
Not the other way around.
Next Week
Part 5: The Brake Pad Must Survive Until the Last Millimeter of Friction
In the final installment, we’ll examine how proper brake pad engineering focuses on surviving the entire wear cycle—and why true durability means reaching the end of friction life without compromising structural integrity.
About NRS Brakes
NRS Brakes manufactures brake pads built around its NRS (NUCAP Retention System) technology, which uses hooked, galvanized steel backing plates to retain friction material through mechanical attachment rather than adhesive. Its pads also feature a noise-dampening piston insert. The approach underlies the FMSI “Z” designation for OEM-specified mechanical fusion. NRS Brakes is based in Toronto, Ontario.
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