My 2017 Dyna is due for a fluid flush. I’ve done it on my FXR using a mighty vac easily, however with the ABS actuator I’m unclear on best practice. I’ve read that you need to do a traditional flush, then using the digital tech (I have a Diag4Bike which does the same) you follow instructions to cycle the pump to flush the actuator.

But once that’s done, do I flush the fluid again? To clear the “bad” fluid moved out of the actuator and into the lines?

Also, anyone know the fluid capacity of the system? I.e. how much fluid do I need? One, two, three 11oz bottles? Going to use Bel Rey Dot 4.

Thanks

 

After you activate the ABS Module you need to flush the system again. Not sure, but 2 Pints should be plenty.

 

Thank you. That’s what I assumed but wanted to be sure. Thanks.

 

Before you start, use a syringe to pull the fluid out of the M/C. Then fill the M/C with fresh fluid from a sealed container. (Hygroscopic, you know.)
Then, start your process.

 

why do that to the master cylinders? maybe I missed something here

 

interesting, not using HD DOT 4 Premium? with some of HDs ABS issues over the past years, I'd fear using aftermarket fluid.

 

I am going to use the mighty vac - same result.

To have fresh fluid pulled down the lines instead of what's been sitting in the MC for the last two years collecting H2O

I've never heard that before. Could easily be HD "use our products or else" BS but I'll research. Thanks.

 

when using a Mityvac you pour fresh fluid into the reservoir as the level drops. I can't imagine the fluid in the MC is worse then whats in the lines. You seem to be stating the fluid in the MC absorbs moisture while fluid in the lines does not.
Am not a brake expert but just reading the thread.

https://www.harley-davidson.com/us/e...uid/p/41800770

its your bike, whatever works for ya. Good luck.

 

Well, I don't know how to explain it any clearer. I'm flushing the brake fluid. That means replacing it. All of it. Doesn't it make sense to you that you would want to remove old fluid from the res so when you start you are pulling FRESH fluid from the MC reservoir, down the lines, into the caliper pistons and out the bleeder replacing the old fluid in the system? If you don't get that I can't help. Sorry.

Maybe you think I'm only bleeding?

 

I'd recommend you get something like the Ares 1L vacuum bleeder. It will make the job much easier.

https://www.arestool.com/products/1l...-fluid-bleeder

https://a.co/d/gBbhiWc