How do you "Bench Bleed" a remote reservoir tandem master?

[cdnpont]

A question that has me thinking probably too much,

 

We'll have a Wilwood tandem remote master conversion in the 50 Plymouth, reservoirs mounted somewhere up on the firewall or wheelwell.

Is there a way to bench bleed such a master before installing it? Or must it done in car?

How could you possibly manage the entire closed system on a bench, and be able to transfer it back into the car when bled?

 

I'm thinking, in car, two separate bleeder lines made up that can reach up and into those reservoirs. Fill, pump pedal, and watch until no more air is seen up top? Disconnect the bleeders, re-connect the brake lines?

Seems like a painful process, as the distance the air bubbles must travel up to reach the remote reservoirs is quite far. It's not like bench bleeding a standard open top master on the bench, where you can see right down into the ports and watch each tiny bubble appear. 

 

Any thoughts, I see nothing on line so far of how to approach this.

 

Thanks, Mark

[Sniper]

Since it's a fresh setup, I would draw a vacuum at the output ports and bleed it that way.

[Sam Buchanan]

Maybe I got lucky but I just filled the reservoirs and bled the cylinder using the bleeders on the master cylinder.

Edited April 27, 2023 by Sam Buchanan

[Plymouthy Adams]

as your residuals are inline and not in the master you should not have issues 

[cdnpont]

Thanks guys,

 

Both would be so much cleaner of a job. Can you imagine the mess using lines up the the reservoirs?

 

This master doesn't have bleeders though.

The master has ports on either side to choose from, you just plug 2. But they all are all 1/2-20 UNF with a crush washer, so a 1/2-20 UNF male/female to male bleeder adapter might be tough. Haven't looked for one yet.

The vacuum idea is a good one...if only I can adapt some bleeders onto the master it would make for a super clean job.

 

 

[cdnpont]

12 minutes ago, Plymouthy Adams said:

as your residuals are inline and not in the master you should not have issues 

 

Yes, if disconnecting the connections at the master with fluid filled lines, this will be a godsend. Should be little to no drainback. 

So the suggestion is to just hook it all up as dry, fill and bleed it all at the wheel cylinders?

[Plymouthy Adams]

many folks have their own method and routine on brake bleeding.....I for one will not pump the brakes until the very final step.  I will vacuum bled solo....if I have a helper, the method is to have them slowly press the pedal down while I open the bleeder then secure before instructing them to slowly let the pedal come back up.  Do this till you see no air bubbles in the see through bleeder hose you hopefully are using so to keep the fluid off the floor and underside of the car and tires.  This method prevent aeriation of the fluid from premature pumping you will do for those last couple bubbles.   As for hooking it up dry, your unit should have some assembly preservative/lube and would not hurt to place it on the bench and allow fluid to enter the chamber just to active and wet the seals...wetting the seals would be my first concern here...not air.

[Sniper]

Dorman 14151 Master Cylinder Bleeder Kit contains 2 each of 1/2-20 fitting