Hydraulic Brakes 39 Ford.

[tubman]

Originally Posted by RKS.PA

Denny, agree about the leaking. And I, too, am a big fan...have them on all my cars. However, if the check valve fails to "check" couldn't that let air seep back into the system? I wouldn't necessarily see it because I'm in the car pumping the brake pedal?

I would have to think that if there was a leak in the check valve it would be much more prone to leaking fluid out when the fluid is under hundreds of pounds of pressure rather than air leaking in under 14.7 psi. Also, wouldn't air leaking in eventually give you a "spongy" pedal?

It will be interesting to see how this comes out; I'd hate to lose my Speed-Bleeders.

[RKS.PA]

Originally Posted by tubman

I would have to think that if there was a leak in the check valve it would be much more prone to leaking fluid out when the fluid is under hundreds of pounds of pressure rather than air leaking in under 14.7 psi. Also, wouldn't air leaking in eventually give you a "spongy" pedal?

It will be interesting to see how this comes out; I'd hate to lose my Speed-Bleeders.

That's makes sense and realize air would cause a spongy pedal rather than a lock up! I, like you, never intend to give these up!! Think is was 51merc that put me on to these 4 or 5 years ago in a post about brake bleeding.

This has been a very instructive thread for me. Thank you Phil...even though we haven't solved your problem yet!! I went out to my shop and checked the spare pair of speed bleeders I keep as a reserve. They are Dorman...made in China. I've had two failures with these. Am throwing out my spares and buying some "Made in the USA"....betting these won't fail!!

[19Fordy]

I think it's time to rebuild the MC.

[meric42]

I had a similar problem on my '53 after changing the brake light pressure switch out three times from a shiny looking one to an old crusty one, now my brake lights are only on when I press the pedal. Just goes to show just because it's shiny doesn't mean it's good

[Phil Gillespie]

Originally Posted by 1931 flamingo

How about the length of the rod that goes into the cylinder from the brake pedal??
Paul in CT

Have not had this out or adjusted recently. Have had no cause to adjust.
Phil NZ

[Phil Gillespie]

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Originally Posted by 19Fordy

I think it's time to rebuild the MC.

Yes kinda think so. Have these bits now on order. Local NZ supply so should not take long.
Phil NZ

[RKS.PA]

Originally Posted by Phil Gillespie

Yes kinda think so. Have these bits now on order. Local NZ supply so should not take long.
Phil NZ

Good luck, Phi. Please keep us posted and hoping this solves your problem!!

[Phil Gillespie]

Originally Posted by RKS.PA

Good luck, Phi. Please keep us posted and hoping this solves your problem!!

Yep will do. I also hope it does. Winter/Spring here now time to be out driving these fine vehicles.
Phil NZ

[Phil Gillespie]

Update:
Just replaced the original M/C with a new one. This has fixed the problem. The new one has the smaller screw in top with a vent . Speed bleeders are ok.
Appreciate all advice.
Phil NZ

[Clem Clement]

Have you tried going back to the
old system?

[Clem Clement]

What is a speed bleeder, please?

[tubman]

A "Speed-Bleeder" is a replacement bleeder screw with a check valve inside of it. It will let the brake fluid out but not back in. They are a boon to those of us who do not have a "cooperative other" to pump the brakes for us; they allow one person bleeding of the brake system. Here's a link : http://www.speedbleeder.com/.

[RKS.PA]

Originally Posted by Phil Gillespie

Update:
Just replaced the original M/C with a new one. This has fixed the problem. The new one has the smaller screw in top with a vent . Speed bleeders are ok.
Appreciate all advice.
Phil NZ

Glad you found the problem part and glad you fixed it!! Thanks for keeping us update....trouble shooting this one step at a time.