The connection between the brake lights and the cruise control is unclear. By using LEDs the current consumption was reduced - no "bleeding off" of excess. What can be said with some confidence is that the addition of the correct size resistors would return the electrical consumption to the same level as the incandescent bulbs, and the circuit should operate as previously. The problem with using LEDs in some automotive applications is that there are sensor circuits that flag burned-out lamps by observing a reduction in current; since LEDs use less current they trigger the sensors. More commonly, and with the MDX, the current is used to make a flasher relay work, and a change in current changes the rate of flashing (hyper-flashing). The fix is the same: add resistance so the total is the same as previously. Other cars still use socketed flasher relays, which can be replaced with relays that are not current-dependent for the switching (they have a timing circuit inside). Unfortunately the MDX still uses the current for flashing but it is built-in and can't be replaced - hence the resistors.