[lrscott]

I ended up having to buy a used pump on fleabay that was "rebuilt 5 months ago". I got it today installed, and its not functioning properly. I'm really ticked off about it, I spent $250 on it :evil: . The trac, abs, and brake lights flicker on and off every time I push the brake. I decided to replace the pressure switch with the one from my old one (known to be good) and the same symptoms are showing. I'm thinking maybe its the accumulator but can't replace it at the moment, anyone have any input? All help is great appreciated, thanks in advance.

 

[ghur]

The lights coming on with brake application is a classic symptom of a bad accumulator - as you apply the brakes there is a sudden drop in system pressure due to the lack of reserve pressure in the accumulator. The ECU interprets this as a problem and the lights illuminate as a warning but simultaneously the relay is triggered and the pump runs to restore the pressure which puts the lights out. (thats my theory. Can anyone correct me)

The main thing is your pump runs and switches off which shows that the pressure switch and relay are doing their job. I think that you will have no choice but to replace the accumulator.

 

[lrscott]

Well, I do have one good accumulator. Its old but it does its job, its from the previous pump. I'll give that a try tomorrow. I am still angry though, I paid the extra money thinking the accumulator had been replaced on the pump, but I guess not. Hopefully I'll get my rover on the road tomorrow, but we'll see. Thanks a lot for the help.