Do I need to bench bleed '40 master cylinder
 

I have done a search and read several posts on this subject. Some say I need to bench bleed others say it's not needed. Please help. I have a new '40 style master cylinder from C&G Ford. Should I bench bleed or not?

Re: Do I need to bench bleed '40 master cylinder
 

I do before install.

Re: Do I need to bench bleed '40 master cylinder
 

I've never done it.

Re: Do I need to bench bleed '40 master cylinder
 

NO generally not on a single system , DO not push the pedal all the way to the floor when bleeding when you install.. Also speed bleeders are your best friend right about now.

Re: Do I need to bench bleed '40 master cylinder
 

Whether you really NEED to or not, I still do. It's just less air to pump out through the lines.

Re: Do I need to bench bleed '40 master cylinder
 

I never have.
As soon as it's installed, you fill it and start pumping fluid thru.
Bench bleed seems redundant.

Re: Do I need to bench bleed '40 master cylinder
 

The one I got from Napa needed to be

Re: Do I need to bench bleed '40 master cylinder
 

No. Lines & wheel cylinders are prolly gonna be full of air anyway. Why bother!?

Jack E/NJ

Re: Do I need to bench bleed '40 master cylinder
 

I've never bench bled a single one - on any car. Seems to me to be great way to get brake fluid all over the engine compartment (or frame) - that crap eats the heck out of any paint you might have.

Not saying it is a bad idea, but by the time I'm putting in a new master cylinder, I've usually screwed with the brake cylinders or calipers . . . but maybe that is just me!

It can't hurt yah - but might make a good mess!

Re: Do I need to bench bleed '40 master cylinder
 

I don't bench bled them.

Re: Do I need to bench bleed '40 master cylinder
 

Some master/slave cylinder with a remote resiovour are an example of a system that needs to be bench bled. As was used on B 25 towmotor clutch.
Bruce

Re: Do I need to bench bleed '40 master cylinder
 

Thanks everyone. I am going to install it with out bench bleeding.

Re: Do I need to bench bleed '40 master cylinder
 

After you install and fill with fluid, leave the cap off and gently press on the brake pedal a few times. You will see bubbles escaping and that should "bleed" the cylinder just fine. Then do the lines.