2006 ABS Actuator - pump replacement not whole assembly

Yeah a whole lot of ideas think of it like this The pump pumps the brake fluid there are no hoses per se it's all ways in that aluminum block that the pump and the accumulator is screwed into The pump pumps the fluid goes somewhere under pressure and it bleeds down not in the pump usually It bleeds down in the container or the accumulator that holds the fluid under pressure or the ways that the accumulator is connected to some valves are leaking and allowing fluid to lose pressure probably flow black up into the reservoir and the pump just runs again to make the same pressure for it to falter and get pumped back into the reservoir or out of a leaking wheel cylinder or caliper either way The pressure is going down not because the pump can't make it because the system can't hold it so you can replace the pump all you want and it'll just keep pumping like gangbusters trying to make pressure that the system can't hold so replacing the pump doesn't really seem like good sense to me Even replacing the accumulator might not be the way to go because it may be valving inside the aluminum block that's got dirt stuff in it and keeping one of these valves from closing fully or something along those lines That's why most people change the whole accumulator assembly once you have it out of the car and changed and the other ones working if you're so inclined you can tear apart the accumulator you just took off that you know doesn't work and have your way with that while your car works with the replacement you took from another car you bought brand new and then you'll really see what you're up against or you can go to junk yards and see almost the exact same part and some BMW I series cars and take one of those apart standing in the junkyard and you'll see how complicated and how messed up and why the aftermarket hasn't picked it up but don't just take my word for it by all means take it apart and have a look but before you spend $150 with Alibaba you might want to do all that so you can see what you're doing because I don't think the pump is going to get you any satisfaction

 

If you have codes indicating leakage / loss of pressure, I'd be inclined to suspect one of the many solenoid valves inside the actuator.

 

Sure! This would be chasing a fool's errand. The actuator has an accumulator and a motor mounted on it. Everything else is internal.

The accumulator is easily replaced, just by bleeding off the pressure using the Techstream dump function and then unthreading it from the actuator body. Easy peezy and can be done with the unit remaining in the car. Been there, done that.

The motor assembly, on the other hand, requires disassembly of the opposite side of the actuator assembly to disengage the motor power busbars, which are spot welded to the power source bars. All of this typically results in more damage to the unit. It also requires full removal of the actuator from the car. If you're doing that already, why not just install a good one?