Schottky Diode You should never use a Schottky diode on a reversing ESC. You should use one when you begin to pull high amp’s, say above 30, you can do it at lower amps also but it probably won't help much but it will certainly not hurt.
Why you ask, well your motor has a coil inside and when the coil is introduced to a switching current from the ESC it generates an inductive load. Remember that your ESC is turning on and off the voltage and current to your motor several thousand times a second. When you charge and discharge the motor this built up current has to go somewhere during the ESC off cycles. Without a diode that somewhere can be right back to the ESC’s MOSFET’s, and this can be in the form of a large transient voltage and current spike. This back at ya can cause damage, particularly at high current draws.
Since your motor is trying its best to get rid of current during the off-cycle, and we don’t want it to go back to the ESC, you install a Schottky diode that will keep the current contained in the motor. By wiring a diode across the motor, we can return the energy back into the motor, instead of the ESC. I believe this returned current also causes the motor to spin down slower then if there were no diode for improved efficiency. NOTE: The silver band on the diode goes to the positive terminal of the battery Capacitors Capacitors are used to reduce the radio noise that is created by an electric motor. This noise can cause radio signal interference and the dreaded glitching. To help suppress this noise you should install three 0.1µF (micro-farad) 50V, non-polarized, ceramic capacitors. These capacitors help suppress the noise generated by the motor to improve reception. There is no polarity to the capacitors to be used so there is no need to worry about positive (+) or negative (-). Simply solder your first capacitor from the - side to the motor can, #2 from the + side to the motor can and finally #3 between the - and the +.
Note that some motors have a small tab between the brush hoods that you can solder on to in place of the motor can. Its much easier to solder to these tabs than the can so be sure and look for them. Click on the above picture and you will see the tab and the capacitors. Keep in mind that it is not necessary to leave the capacitors leads at their full length. It is actually advantageous to trim them so they are just long enough to fit from one motor tab to the other. | 
