Is bench bleeding a MC necessary if using a pressure bleeder (Motive)?

[AR67GTX]

What say you guys on this? I’ve just finished flushing my system with denatured alcohol and getting ready to install new wheel cylinders. I have a bench bleeding set up that I can out on it (MC is on the car - will have to pull the line off - stroke with pedal). It’s a 66 with a single pot MC. Just wondering if it’s really necessary with a Motive pressure bleeder?

 

[themechanic]

Yes, bench bleeding is always a good idea. That's why master cylinders come with the kit to do so and is recommended by the manufacturers.

 

[pnora]

The pressure bleeder may do the job. Myself I would fully bench bleed it first. I believe working the piston will remove all the air where the pressure method may not.

 

[AR67GTX]

Thanks

 

[1 Wild R/T]

I never bench bleed, I either bleed on vehicle with my syringe or I use a pressure bleeder....

 

[padam]

Put me in the always bench bleed camp

 

[Sixpactogo]

Put me in the always bench bleed camp

Me Too.

 

[steve340]

I also never bench bleed but I use a vacuum bleeder. Pressure bleeding should not need to bench bleed as you are "pushing" the air out.
All this assumes the master cylinder piston is in the correct position and the master is not faulty.

 

[Sixpactogo]

I don't assume anything. I just do it because that is the method I learned from the FSM. I'm sure there are a dozen methods that will get the same result even if some take a few attempts. I too use the vacuum bleeder for each wheel cylinder mostly because my wife is busy doing her own thing and I don't want to bother with finding a helper. But then again, I would not be fiddling around with a single pot master cylinder either. I have two cars that came with them but that was the first thing I scrapped. I have never had one fail but I know people that have. Few things on a car more important than brakes IMO.

 

[dadsbee]

I didn't do it and ended up doing this to get the air out of the masters nose !