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Correct booster for a 69 with power brakes

Forum: C3 Engines, Driveline and Handling

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Correct booster for a 69 with power brakes

Posted: 10/13/13 3:47pmMessage 1 of 17
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

 My master cylinder seized up and I bought a replacement.  The new one came in and it doesnt match the old.  It also will no work with my current master cylinder.

now I have no idea whether the old ones are correct or fi the new booster is.

here are both

notice the mounting surface is completely different.

here is the old booster

and the new booster

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Re: Correct booster for a 69 with power brakes

Posted: 10/13/13 7:40pmMessage 2 of 17
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
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
Ben...can you look in the area I circled on this pic, and see if you can see the numbers? That will give us an idea of the year, and part number, so we can possibly confirm it's original application....




|UPDATED|10/13/2013 7:40:19 PM (AZT)|/UPDATED|

Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Re: Correct booster for a 69 with power brakes

Posted: 10/13/13 7:59pmMessage 3 of 17
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
yeah ill look, ill have to wire brush the paint off.   This part is supposedly the same from 68-76..  can anyone look and see what shape theirs is?
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Re: Correct booster for a 69 with power brakes

Posted: 10/14/13 4:25amMessage 4 of 17
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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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
I know the booster on my '74 is flat where the master bolts up, as your "original" is. Can't say I've ever noticed one that was sunken in, as the new on is. I'm also thinking some big blocks had a smaller diameter booster to help clear the valve covers....

Joel Adams
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Re: Correct booster for a 69 with power brakes

Posted: 10/14/13 8:51amMessage 5 of 17
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rraider1
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Woodland, WA - USA
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Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
it looks like they sent you the booster for 64 to 67 not the 68 to 76
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Re: Correct booster for a 69 with power brakes

Posted: 10/14/13 11:39pmMessage 6 of 17
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
This style (sunken) is what willcox, corvette central and paragon all sell Those paragon does have a rebuilt original that look like my old one None of them seem to understand the difference between these boosters even though it is obvious
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Re: Correct booster for a 69 with power brakes

Posted: 4/9/14 9:56amMessage 7 of 17
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
I brushed the paint off that area and there is no part number


(large image modified to link-aapple)


|UPDATED|4/9/2014 9:56:18 AM (AZT)|/UPDATED|
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Re: Correct booster for a 69 with power brakes

Posted: 10/15/13 7:38pmMessage 8 of 17
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
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
Dang...sure looked like they were there. There ARE numbers stamped on the front of that thing...somewhere....assuming it is an original Delco booster. If it is a reman, or aftermarket replacement, then all bets are off....Ouch

Joel Adams
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Re: Correct booster for a 69 with power brakes

Posted: 10/15/13 11:23pmMessage 9 of 17
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
Can anyone post pictures of their booster from a 69
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Re: Correct booster for a 69 with power brakes

Posted: 10/16/13 8:00pmMessage 10 of 17
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
Okay can so done post pictures of any boosters from 68-76??? I am tying to return the part and they are claiming it is correct.
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