Answer :
Final answer:
The usual maximum pressure for pressure bleeding a brake system is 20 psi. Exceeding this can cause damage to the brake system. So the correct option is:- c. 30 psi
Explanation:
The usual maximum pressure that should be used when pressure bleeding a brake system is 30 psi. When bleeding brakes, it's crucial to maintain the correct pressure to ensure effectiveness while also preventing damage to the brake system components. Using a pressure higher than the suitable range could cause harm to the seals and other brake system parts. The range is specified by the vehicle manufacturer or the equipment used for brake bleeding.
In the context of fluids and pressure, a reference point is that 100 millibars (mb) equals 1 times 104 pascals (Pa). Pounds per square inch (lb/in2 or psi) are often used in various pressure measurements, such as tire and blood pressure. This understanding of pressure is based on Pascal's principle, which states that pressure applied to a confined fluid is transmitted undiminished in all directions within the fluid and to the walls of its container, as is the case with hydraulic brake systems.
