Clever!!! It's similar to how you have to fill some modern coolant systems. I had to use that method to refill the coolant on 2004 C4S. I didn't realize it was used for brake systems too.
Quote:
Originally Posted by TwoBluPorsches
One time I experienced an extremely difficult to bleed motorcycle front master and single caliper.
A system so simple you couldn’t imagine that it would be the least bit difficult. But I just couldn’t get it to work correctly after doing all the standard DIY methods.
Because of this, I did research and ended up learning about how to fill a dry system the way they do it at the factory.
Basically, a factory fill from dry starts (and ends) with a connection to the master cylinder reservoir and nothing else.
Connect to the master reservoir with a short hose up to Y connection with two valves on each side of the Y.
One side of the Y will be the fluid supply, close that valve.
From the other side of the Y, pull a vacuum on the brake system. This is where a factory filling system would look for leaks.
Once the system is evacuated, close the valve to the vac pump and open the valve to the fluid source and watch the fluid gets pulled into the system. A factory filling system would verify the correct volume of fluid is sucked into the brake system.
Done.
No need to open bleeder valves, pump brakes or other techniques are used.
The system won’t have air to bleed out because all the air was removed before the fluid was introduced.
I’ve never seen one of these tools in person or used one, but I was able to use the concept and I’ve used this method on several occasions and had good results.
I imagine that the calipers and/or master could be bench bled with this method, but they don’t do that on an assembly line.
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