Final answer:
When installing a piston into a caliper, a high-temperature synthetic brake lubricant should be used. It helps reduce friction and the force required to insert the piston.
Step-by-step explanation:
When installing a piston into a caliper, it is important to use a high-temperature synthetic brake lubricant. This type of lubricant is specifically designed to withstand the high temperatures and pressures that are common in brake systems. It helps reduce friction between the piston and caliper, improving brake performance and preventing sticking or seizing of the piston.
Using a lubricant during installation can also help reduce the force required to insert the piston. In the given scenario, if the steel parts were oiled, the magnitude of the force that the major would have to exert to insert the piston would be less than 300 N. The exact force would depend on the specific lubricant used and the condition of the piston and caliper.