[Trak Ratt]

Thanks Kurt, I did forget to mention “bleeding the water off”. I seldom forget, but am always sorry when I do. Pneumatic air tools run better without hydraulic assist too

15 PSI is probably a better max pressure. I noticed that right around 20 PSI the overflow hose starts to “weep” where it joins the reservoir.

[APKhaos]

Most everything's been said here, but not sure why you are needing to reeatedly pump the MPB?

My SOP for a fluid flush is:
- Fit the empty MPB and pump up to 15 psi to check for sealing.
- Fresh can of ATE into the MPB reservoir
- Pump it up to 15 PSI
- Flush all four.

I check the pressure, but very rarely need to add more. Its usually down to around 12PSI by the time the 2/3 Liter it takes to flush is done.

If its just a bleed job, its quicker to use the MPB dry - just keep an eye on the reservoir.

[Vicegrip]

Dave, too true about H2O in the tank. When I moved mine to the shed from the shop I added a auto blow down device from HF after finding a gallon or two of nasty rusty slime water in it. (I am a bad compressor owner) BTW the HF auto unit is crap and failed real quick. I chucked it and just added a long drain line and an easy to use ball valve.

[nova996]

I'm pretty happy with the motiv setup, too. I don't feel like I need to pump very much. It's still effective even if the pressure has dropped a few lbs. And running it dry or with the intake out of the fluid at the end makes setting the level very easy.

But if anyone does want to use a compressor, I have a very nice billet aluminum reservoir cap (or adaptor I guess) with a brass outlet on it to connect an air hose. Anybody who wants to try it can have it. It fits the BMW reservoirs, so it should fit most Porsche ones I guess since the motiv european adaptor seems to work on everything.

BTW medical syringes work really, really well for removing excess fluid from the reservoir after changing pads, etc. I always have a few in my track bag. Feel free to steal one from me any time.

Firoze

[Trak Ratt]

Originally Posted by APKhaos

Most everything's been said here, but not sure why you are needing to reeatedly pump the MPB?

If its just a bleed job, its quicker to use the MPB dry - just keep an eye on the reservoir.

That’s pretty much what I was saying. I don’t like putting the entire contents of the blue/gold in the Motive and also don’t like storing once open cans of brake fluid. I’m just paranoid about the hydroscopic issue. So I fill up the reservoir for each caliper.

How about just fitting a valve stem to the reservoir cap (with cap of course). Then you can simple use one of those “clean, dry caned air”

Wait, wait, how about modifying the overflow line to include a valve stem, pressure gauge, shut-off valve, all in one.

[APKhaos]

Originally Posted by david riley

How about just fitting a valve stem to the reservoir cap (with cap of course). Then you can simple use one of those “clean, dry caned air”

Wait, wait, how about modifying the overflow line to include a valve stem, pressure gauge, shut-off valve, all in one.

Why am I seeing images of blown MC seals and leaking fluid??
Guess I'm paranoid about the risks of over-pressuring the atmosphere side of the system. Its really not too much trouble to hook up the MTB and be sure the system does not get an accidental overpressure. ANd you thought I was a thrill seeker!

[jpinkert]

Originally Posted by APKhaos

My SOP for a fluid flush is:
- Fit the empty MPB and pump up to 15 psi to check for sealing.
- Fresh can of ATE into the MPB reservoir
- Pump it up to 15 PSI
- Flush all four.

Same here --

[Jazzbass]

Originally Posted by APKhaos

Most everything's been said here, but not sure why you are needing to reeatedly pump the MPB?

My SOP for a fluid flush is:
- Fit the empty MPB and pump up to 15 psi to check for sealing.
- Fresh can of ATE into the MPB reservoir
- Pump it up to 15 PSI
- Flush all four.

I check the pressure, but very rarely need to add more. Its usually down to around 12PSI by the time the 2/3 Liter it takes to flush is done.

If its just a bleed job, its quicker to use the MPB dry - just keep an eye on the reservoir.

The only thing I'd add is the bleeding order: RR, LR, RF, LF.

[Rob in VA]

Has anyone abandoned using their power bleeder for a better solution?

[Vicegrip]

Why? They are inexpensive, easy to use and when used per the instrutions do a great job with little risk of blowing a slug of air into the system.

There are some good vacuum based systems out there but you have to use it on one end ant a top off system on the other. Now you have two things to clean. The vacuum systems also need you to pump a bunch more than a Motive or hook up to an air hose and listen to it hiss the whole time.

google Vacula. They make some very nice equpment.