Main Brake Calculations

Project

Study how the weight of the car affects braking. Ensure that our current braking system meets FSGP 2017 and 2018 regulations.

Relevant Regulations

1. Must be able to stop from speeds of 50 km/h or greater. For these calculations, we will look at speeds between 50km/h and 100km/h.
2. Average deceleration must be greater than 4.72 m/s^2
3. Hydraulic brake lines must be able to handle much greater pressure beyond what is needed.
4. Rear brake must be able to hold the car in place (ie force from one of the master cylinders) for a force up to 15% of the car's weight (varying between 400kg - 1000kg) with ballasted driver (~70kg)

Assumptions

1. Car is on level ground.
2. Friction between wet pavement and rubber tire.

Information (to be checked from current system) 

1. Thickness of brake pad (>6 mm) - current is less than 5mm, need to buy new ones. New ones have  0.3 inches thick
2. Brake pad contact area (>600mm^2) - should be 2 inches area contact
3. Maximum pressure allowed in brake lines - assume lines meet max pressure

Relevant Equations

Possibly this site - http://www.engineeringinspiration.co.uk/brakecalcs.html

Braking Force

Wheel Lock

Brake Torque

Disc Effective Radius (Full Circle)

Clamp Load

System Pressure

See page for other calculations. I still need to double check that these apply to our car and can be properly used. Also, can use FBD to determine braking force for deceleration. Formulas for stopping distance also from above page.

Results