Brake master cylinder bleeding
As I have been reading the dialogue about brakes it reminded me to do what I have intended to do for a while and that is to change out my plastic reservoired m/c to the corvette m/c.
As I was bench-bleeding my new m/c using plastic see through hoses run into the reservoirs so I could observe the air bubbles escaping I observed some interesting phenomenon that would have gone unnoticed if the hoses had not been clear.
As I stroked the plunger I noticed that the front brake res. cleared of air very rapidly, pushing out air and pulling fluid back in. The rear brake res. took a lot longer to clear. I also noticed that the rear brake fluid took a noticeable delay before the fluid started moving in the hose. This, it seems, has a function of a hold off valve which delays the application of the rear brakes so that they don't cause the rear end to come around under hard braking.
I was not satisfied that all the air had been pumped out of the rear portion of the m/c as it stopped pumping any fluid through the clear hose when the front portion had been cleared of any air. I then decided to put my brake vacuum pump on the hose and sure enough there was air still in the rear plunger. Air that would not come out using the standard method. This would have caused me lots of trouble as was talked about above concerning Juggernaught's brake problems.
This tells me that using a brake vacuum pump is a very valuable tool when it comes to brake bleeding. Besides it makes bleeding the brakes a one man job. :sa: :sa: :sa: