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Old 07-20-2012, 02:43 PM
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S10 355 brakes don't work very well

I have an 85 s10 with a 355 and a 536 lift cam. It is almost like I dont get enpugh vacuum for my brakes to work good. Is there any way I could get more vacuum to my brakes. What if I got rid of brake booster? replaced vacuum line from valve cover to booster because it was sucking shut. Brakes work a little better but not greatt. Any ideas??

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Old 07-20-2012, 08:11 PM
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I'd run the vacuum line from the intake manifold. You'd probably get a stronger vacuum, hence better brakes. I've owned vehicles without a brake booster & it's no fun. If the line from the intake doesn't work, put a vacuum canister in the truck. You can get them from Jegs, Summit, etc. for about $35-50. It just plumbs in & maintains a little pressure so it don't need a whole lot of vacuum from the engine when applying the brakes. A lot of old school racers use them. Especially on HOT street engines so they can keep the power brakes. Simple fix to old problem.
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Old 07-21-2012, 05:39 AM
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That is probably what i'll do thanks
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Old 07-21-2012, 06:08 AM
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It is COMMON for vehicles such as yours with a big camshaft to have issues with not enough vacuum for the brake booster. You need a separate electric vacuum pump.



Summit Racing has them.

Hella 009428087 - Hella Street Vacuum Pumps - Overview - SummitRacing.com

Or ... if you are salvage yard prone ( who is not ?? )
Find a diesel powered GM vehicle with the small 12V electric vacuum pump.

Buick
82 Skyhawk-J
82- 85 Skylark-X


Cadillac
82 Cimmaron
Chevrolet
84-86 Celebrity-A
82 Caprice-B
82 Cavalier-J
82-85 Citation-X
Oldsmobile
86 Cierra-A
82 Firenza-J
82-84 Omega-X
Pontiac
85-86 6000
82 J2000
82-84 Phoenix-X

I get them for less than 25 dollars used ... and they work perfect for a over cammed SBC.

I got this photo off the internet



DEUCE .. Moderator
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Old 07-21-2012, 06:16 AM
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Yeahh I was looking at some on the ebay wondering if any woyld work rather than paying a lot for one through summit. Nowis tgere normally two fittings on those. Where do you hook in from the the vacuum line on carb to that pump?
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Old 07-21-2012, 09:03 AM
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Would one work from a Volkswagon or a saab or audii? also How do you wire these up and is there a switch you have to use so that it knows when to shut off?
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Old 07-21-2012, 06:30 PM
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Get yourself copies of the wiring diagrams for your truck & the donor vehicle. If you wire it inline with the ignition coil or another wire that only gets power when the switch is turned on, you should be fine. Should work on any type of vehicle. Foreign or domestic. Good luck!!!
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Old 07-21-2012, 06:35 PM
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Alrite how do you run a relay or fuse off it and do you have to have a switch so it shuts off once it reaches a certain bacuum
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Old 07-21-2012, 07:02 PM
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Not sure. That's why you need the wiring diagrams. It'll take the guess work out of it.
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Old 07-21-2012, 10:22 PM
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You hook it to the brake booster ... not the carb.
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Old 07-22-2012, 12:01 AM
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So you dont have to get the vacuum out of the engine? Just plug it off orr what?
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Old 07-22-2012, 08:27 AM
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Quote:
Originally Posted by ttjsk812@aim.com View Post
So you dont have to get the vacuum out of the engine? Just plug it off orr what?
NO ...

The electric vacuum pump is the ONLY supply of vacuum that the booster needs to function correctly. Plug the line from the carb to the booster. Keep the line from the carb to the vacuum advance on the distributor if yours has one.

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Old 07-22-2012, 10:28 AM
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Okay! do you know anything about wiring one up deuce?? And running a relay or fuse for it?
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