Many believe you don’t need one, but your vehicle will never stop as good as it could. All factory cars came with them for a reason.
Optimal braking occurs when all four tires want to lock-up at the same time. There are may differences between the front and rear of your vehicle. Weight, tire height, width, compound, pressure, rotor diameter, number of pistons per caliper, piston diameter, brake pad area and compound. The chance that a modified vehicle would not need one is very unlikely. You should always check brake pressures after installing a new brake kit and follow manufacture’s recommendations. To see these parts, check out the P2360 test gauge and B3369 proportioning valve.