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Caliper Disc Brakes - Selection: 5) Determine Lining Life

Determine Life Expectancy of Linings
Another consideration in selecting a brake is the life expectancy of the linings. This factor is particularly important if the brake is to be placed in a "hard-to-service" location, faces long intervals between servicing, or is to be used in a tensioning-constant slip application.
Basically, lining life expectancy is a factor of the amount of energy transmitted through the lining and may be measured in total number of stops or hours of life. Both measurements may be reduced to horsepower hours of heat that the lining must endure.
Tolomatic's standard lining is made of a non-asbestos organic material and has a maximum operating temperature of 300oF. An optional sintered metallic lining (depending on model) offers maximum operating temperatures from 400oF to 500oF.

Calculating Service Life of Linings
The lining life per cubic inch shown by the graph below is based on horsepower hours.

To find the life in hours of lining(s) (Primarily for tensioning-constant slip applications:



Refer to Table 2 to determine cubic inches of wearable material of various caliper sizes.


To find the life of lining(s) in stops: When a rotating mass is brought to rest, the kinetic energy removed can be calculated by the following formulae:

CDB Reference Table 2
 
CDB Reference Table 3

LINING LIFE CALCULATIONS ARE ESTIMATES AND DO NOT ACCOUNT FOR FOREIGN CONTAMINATES THAT MAY ABRADE THE LINING OR DISC AND REDUCE LIFE. WHEN THE LIFE MUST BE KNOWN ACCURATELY, FIELD TESTS SHOULD BE CONDUCTED UNDER ACTUAL OR SIMULATED SERVICE CONDITIONS.