The main goal of maintaining and repairing equipment and machines during the investment stages is to reduce the amount of money spent in order to maintain the validity of their operation and the quality of their reliability under the different given investing conditions (type of manufacturing materials, methods used, temperatures, nature of investment, …. etc). This goal can be achieved if we are able to control changes in the technical conditions of equipment and the frictional parts during the investment stages, besides knowing the physical laws/rules that govern the technical changes properly. Therefore, we carried out a study on the theoretical plans of physical wear of brakes and the frictional parts in means of transportation. This is done starting from wet (oily) wear plans of the frictional parts in machines. Then, based on these plans we studied physical laws/rules determining the intensity of dry wear of brakes, along with its speed and acceleration during the investment and the unreliable, uneconomical (unsafe) operation stages, taking into consideration the methods used in periodical technical maintenance, ways of driving, and the average number of times brakes are used…etc . Based on these formulas obtained, we can estimate/predict the start of ineffectiveness of brakes and friction linings, in addition to the inception time of risky (unreliable) operation stage. Consequently, this stage gives us indications for replacement or treating with the traditional (known) mechanical and chemical ways, in light of the soaring prices of materials in the Syrian Arab Republic.