DomFD3S

I had a question w/ regards to a dual brake master cylinder setup.

I got to thinking. With a single brake master cylinder setup, bleeding is easy because you bleed from the farthest caliper to the closest.

However, with a dual master cylinder setup, how would you bleed it? I know that you can partition the cylinders where one is for the front calipers while the other is for the rear calipers. How would you bleed this setup now w/o getting air in the system? After all, you still only have one brake pedal.

Am I making this far more complicated than what it is? I'm interested in upgrading my brake master cylinder to either a larger unit or a dual cylinder setup.

Thanks guys.

DamonB

Yep. A dual master is two completely independent circuits, the brake pedal just happens to actuate both (hopefully through a balance bar). If you don't know what a balance bar is you have no need at all for dual masters.

The only idea in bleeding is to do the longest line for each master cylinder first. Each master doesn't even know the other exists, they share nothing.

Eggie

I've found that bleeding dual-master brakes requires a little extra care. Because the better bled master cylinder will take all the pedal pressure, you can't really pump the fluid through the other side very well. Disconnecting the cylinders from each other and bleeding each separately (or at least moving the bias all the way to each end) makes a world of difference here.

DamonB

Never thought of that, very good advice. Thanks.