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ECE Regulation 90 (abbreviated "ECE R90") is an ECE Regulation specifying design, construction, and performance requirements and test protocols for replacement
brake lining Brake linings are the consumable surfaces in brake systems, such as drum brakes and disc brakes used in transport vehicles. History Brake linings were invented by Bertha Benz (the wife of Karl Benz, who invented the first patented automobile) d ...
s for roadgoing
motor vehicle A motor vehicle, also known as motorized vehicle or automotive vehicle, is a self-propelled land vehicle, commonly wheeled, that does not operate on rails (such as trains or trams) and is used for the transportation of people or cargo. The ...
s and
trailers Trailer may refer to: a Transportation * Trailer (vehicle), an unpowered vehicle pulled by a powered vehicle ** Bicycle trailer, a wheeled frame for hitching to a bicycle to tow cargo or passengers ** Full-trailer ** Semi-trailer ** Horse trai ...
. R90 calls for linings to be tested for
speed In everyday use and in kinematics, the speed (commonly referred to as ''v'') of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity ...
sensitivity, cold performance, and replacement
Brake pad Brake pads are a component of disc brakes used in automotive and other applications. Brake pads are composed of steel backing plates with friction material bound to the surface that faces the disc brake rotors. Function Brake pads convert the ki ...
s and
brake shoe A brake shoe is the part of a braking system which carries the brake lining in the drum brakes used on automobiles, or the brake block in train brakes and bicycle brakes. A device that is put on a track to slow down railroad cars is also called ...
s are permitted to deviate from the
friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding (motion), sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative la ...
al characteristics of their original-equipment counterparts by not more than 15%. In addition, R90 requires tamper-evident, sealed packaging for replacement brake linings. Type-approval to R90 is required for all replacement brake linings throughout the
European Union The European Union (EU) is a supranational political and economic union of member states that are located primarily in Europe. The union has a total area of and an estimated total population of about 447million. The EU has often been ...
and in non-European countries that have adopted ECE Regulations.


Test protocols

Tests required by R90 include: * Bedding (burnishing) * Performance Check * Brake Tests * Cold Performance Equivalence and Speed Sensitivity Tests For the tests the vehicle brake for which the replacement linings are designed is installed in an inertia
dynamometer A dynamometer or "dyno" for short, is a device for simultaneously measuring the torque and rotational speed ( RPM) of an engine, motor or other rotating prime mover so that its instantaneous power may be calculated, and usually displayed by t ...
instrumented for continuous recording of rotative speed, brake torque, brake line pressure, number of rotations after brake application, braking time, and brake rotor temperature.


Notes

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References

* Vehicle law