PSI for Motive Pressure Bleeder

[The Critic]

I did a brake fluid flush on my mother's DD, a 2010 Altima V6, with a Motive Bleeder and the 1117 adapter.

During the flush process, I used 20-22 psi (though it did fall to 18 at times) and found the flow from the rear bleed valves to be a bit low: it took 8-10 minutes for 16 ounces to drain from each of the rear calipers.

This is a rate that I can live with, but IIRC, the flow was quite a bit faster on my old Saturn with less psi.

How much pressure are you folks using with your Motive during a routine brake flush? I suppose 20-22 psi is safe, but I wonder how much higher I can safely go...30? I remember some Bentley manuals suggesting 29 psi (2 bar) on some VW/Audi products.

Thanks.

 

[NHGUY]

I've gone to 30 psi,but I think they are afraid you will blow the master cyl reservoir apart at too high a psi.

 

[ChiTDI]

14.7 psi is one full atmosphere.
I usually max at that rate for my work.
I try to stay around 10 - 12 on the dial.

 

[Loobed]

Motive says not to exceed 20 psi.

http://motiveproducts.3dcartstores.com/Power-Bleeder-Instructions_ep_50.html

 

[Kiwi_ME]

Since the reservoir was not designed to be a pressure vessel I stick to 10 psi and rely on patience to get me through the job. It would not be pleasant to have it crack and blow brake fluid everywhere and then have to source a new one.

 

[double vanos]

Ditto on the 10 psi! I've got time..... lots of time.. X

 

[scurvy]

10 psi is what I have heard recommended and also what I use.

You're already saving a boatload of time and energy by using a Motive and it's not worth splitting a master cylinder by pumping it up as far as you can.

 

[aualtima3.5]

I typically do 10-12 psi. Why risk blowing the MC?

 

[Car_guy]

Draining 16 oz from each wheel is not necessary. You start the bleed process with the wheel farthest from the master cylinder in order to flush the main line with fresh fluid. After that you do not need to drain the same amount from each wheel. I use the the fluid color to judge how much to flush. The first wheel will start with dark, even black, fluid. It will then go to a darkened yellow color and then it will appear the same as the fluid you are pouring in. Each wheel will take a little less time to flush.

 

[SS1970chrysler]

I use between 10 and 15 psi on mine.