Help setting my ESC up

[autonm]

Just fitted a new Speed Passion 6.5t motor and a SPEED PASSION GRAN TURISMO LPF 2.0 "BLUE" BRUSHLESS ESC .

Following instructions - hold down the little button while turning on etc, wait for the flashing. Push forward until the light comes on - press button... then push reverse until the light comes on etc etc.

Now after that when running the car the light should appear when I am at max speed/forward stick - which it does. However it says that when Im at full Brake/reverse stick the light should also appear... which it DOESN'T

Im guessing I have to adjust something on the transmitter? any any other help would be appreciated. Thanks