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IF you want to eliminate the booster portion of the diagnosis, just push the pedal a few times with the engine off. With reserve vacuum gone you can feel the pedal and hydraulics without the advantage of the booster. It is a bit harder to push, but gives you a better idea of what is going on with the system.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
And...with no vac. in the booster, if the pedal STILL goes down to the floor....well...there ya go! It needs a master. It will be hard to push, but, as Ken says, it will still move. A good master, with no vac. in the booster, will feel solid as a rock, and the pedal will be REALLY hard to push down any more than an inch or so.
Be sure to "bench-bleed" the master before installing it.
Be sure to "bench-bleed" the master before installing it.
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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V
Former Member
Send PMMounds View, MN - USA
Joined: 5/24/2007
Posts: 1034
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
And look for Norsky's pressure bleeder pictures on this forum.
Larry
Larry
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Don't forget about the diverter/proportioning valve, sometimes it will stick, commonly after fluid loss though.
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Thanks guys for all the help; I did replace the master cylinder and then the front rubber hoses with stainless lines... one more bleeding and I should be good.
current
1977 Coupe
gone but not forgotten
1996 Grand Sport
1996 Grand Sport
1984 coupe
1974 coupe
1964 roadster
1974 coupe
1964 roadster
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Well the second and third bleeding, (after the master cylinder and new stainless lines), is complete. ...and now she stops; thanks again for all the help.
current
1977 Coupe
gone but not forgotten
1996 Grand Sport
1996 Grand Sport
1984 coupe
1974 coupe
1964 roadster
1974 coupe
1964 roadster
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w
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Send PMMundelein, IL - USA
Joined: 6/9/2008
Posts: 411
Vette(s): 1978 25 anniversary blue on blue with T-tops.
[QUOTE=Adams' Apple]...
Be sure to "bench-bleed" the master before installing it.[/QUOTE]
Be sure to "bench-bleed" the master before installing it.
[/QUOTE]
What do you mean by Bench-Bleed? I was considering changing out my mc because I see a substantial leak at the back of it by the power booster. I dont know if its seel or mc but Its one.
Will
Lifetime Member #150
Recent Modifications 
"Drive it like you stole it"
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Will,
Bench Bleeding refers to bleeding the MC prior to putting it back on the car. I am sure there is a better way but I filled the MC with fluid and used a screwdriver to pump the piston; eventually fluid will squirt out...
current
1977 Coupe
gone but not forgotten
1996 Grand Sport
1996 Grand Sport
1984 coupe
1974 coupe
1964 roadster
1974 coupe
1964 roadster
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in Forum: C3 Engines, Driveline and Handling
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