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Old 09-30-2007, 07:09 PM   #1
betonj97
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4 Disc brakes w/what booster?

Hello everyone,

I have ran into an issue with my truck, I recently got it registered and on the street. After figuring out I had a leak in the booster I decided to replace it. I went from a 3/4 ton booster to a 1/2 ton booster, and now my brakes suck! At high rpms they are fine but at idle it seems like not enough boost. This is what I have set up: 327 with an rv cam, 1.6 roller rockers, holley carb 650, vaccum booster is connected to the port on the intake manifold rpm perfomer, I have chevy stock disc in the front and lincoln mark V 9" with disc on the rear. Since i replaced my booster to the smaller one I've noticed a drastic change, so I am now contemplating on buying a 3/4 ton booster assuming that because the 3/4 ton booster has more vaccum space it will react better......but thats why I am here wondering if this is so.......
I searched around on the post and really diddn't find anything that pertained to running a 1/2 ton booster versus a 3/4 ton booster.
Thanks again!
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Old 09-30-2007, 07:24 PM   #2
wibilly
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Re: 4 Disc brakes w/what booster?

i belive the 3/4 and 1 tons have duel diaphrams i have a 3/4 tone boster on my 4 wheel disks and they work awsome. i used 4wd front roters and 76 eldorodo rear calipers and no other mods were required
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Old 09-30-2007, 07:48 PM   #3
betonj97
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Re: 4 Disc brakes w/what booster?

Nice, I needed to hear someone was running the bigger one. Hopefully this will do the trick. Any other comments before I order the bigger booster????
Thanks again!
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Old 09-30-2007, 08:52 PM   #4
aventur1
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Re: 4 Disc brakes w/what booster?

so would it makes sense to get the 3/4 booster for my 1/2 ton if I'm going to put rear disc on next year! I currently do not have a booster. 71
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Old 09-30-2007, 09:03 PM   #5
wibilly
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Re: 4 Disc brakes w/what booster?

from my understanding of what i have read here is that a 3/4 ton booster is a good upgrade weather or not you have disk brakes
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Old 09-30-2007, 10:03 PM   #6
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Re: 4 Disc brakes w/what booster?

Good, I have disc in front, might as well buy the 3/4 one.
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Old 10-01-2007, 12:55 AM   #7
betonj97
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Re: 4 Disc brakes w/what booster?

I will let you guys know what the results are but I am certain this will do the trick especially because it works for someone already....thanks wibilly
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Old 10-01-2007, 09:23 AM   #8
herb101
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Re: 4 Disc brakes w/what booster?

I'll second the improvement. My brakes sucked on the Blazer (71 4x4 w/35's) and I have the front-end damage to prove it! I went from the 1/2 ton to the 3/4 ton and saw a Drastic increase in brake perfomace for the same pedal effort.

Herb
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Old 10-01-2007, 01:38 PM   #9
betonj97
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Re: 4 Disc brakes w/what booster?

NICE! I'm digging this even more, thanks for the reply! and sorry to hear about the reck
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Old 10-01-2007, 02:17 PM   #10
Ackattack
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Re: 4 Disc brakes w/what booster?

what about a hydroboost setup
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Old 10-01-2007, 11:01 PM   #11
wibilly
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Re: 4 Disc brakes w/what booster?

that is another option for an upgrade. i belive yukon jack went that route. if you have a highly modified engine producing low vacume that is the only way to go
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Old 10-03-2007, 01:55 AM   #12
betonj97
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Cool Re: 4 Disc brakes w/what booster?

OK OK OK I'm a happy camper......Got the 3/4 ton booster today and threw it in, took her for a test run.......wow, whole different truck. I never realized how much vaccum disc brakes actually needed but it made a huge difference. To those who are building or planning on converting to disc, go 71' 3/4 ton booster. You won't have regrets. I thank you guys for your posts
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