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This isn't about residual pressure valves but there's a video of an engine blowing up on Godman's site.  There's a link to it on  this page.  One dude had his hand on the blower when it blew off.

Yipes! He's lucky he didn't lose a hand - or worse!
Ralph

It did shake him up, but he is fine.(we have it in our shop is how I know this)

I hope I am not really changing the topic but I have been bothered by a brake problem since I got my 50 F1 on the road, mustang II, 9" rear with drum brakes, proportional valve, 2 and 10 psi residuals, an a power brake under the floor,  The brakes work and are solid, even broke a rear brake line and the fronts worked till I repaired it.  The problem is it does not feel like I have power brakes, I have vacuum from the rear of the intake manifold. What test or advice do you recommend for me to test and resolve this on going problem Ed ke6bnl

Rule of thumb is 18 inches of vacuum at an engine idle at the booster.

Ok rodders....
New MP Brake system (under floor)
New 11" Disc/rotor system up front
Rebuilt (completely) 10x2.5" drums in rear
New lines, proportioning (combination)valve, 2 & 10 lbs residual valves.

LOTS of front end pressure, NO preassure for the rear. Pedal is firm and then gets spongier the more I use it. Have bled and bled and bled the system. Checked M/C, proportioning valve and seem to have lots of flow on the other side of my residual (10 lb.

My question (finally)"could" my residual NOT be holding 10 lbs pressure inline and alowing the system to "bleed back"?
This has me so pi**ed I threw the tires back on and took her for a midnight ride around the neihborhood last night (much to my neighbors chagrin!)

HELP!!!

Hi, new to the board here but I thought I would throw in my 2 cents. The 10lb valve is nothing but a one way check valve.  It will not cause spongy brakes. I am assuming you are starting with a fresh system.  Your problem is loosing pressure right? How did you check the master? If you put your foot on the brake and it falls under your foot to the floor, it is by passing in the M/C.