just had a quick look and i have 1 yell 1 green and 1 purple relay and could only swap 2 as one has 5 pins the other 2 have 4, and it didnt make no diffrance to mine. but what i did notice is that if i pumped the pedal when the pump was still running it was softer and i could push the pedal down more, then it got harder and harder till the pump stoped.