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

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??

s10quint 07-20-2012 08:11 PM

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. 07-21-2012 05:39 AM

That is probably what i'll do thanks

Deuce 07-21-2012 06:08 AM

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. :D

Summit Racing has them.

Hella 009428087 - Hella Street Vacuum Pumps - Overview -

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

82 Skyhawk-J
82- 85 Skylark-X

82 Cimmaron
84-86 Celebrity-A
82 Caprice-B
82 Cavalier-J
82-85 Citation-X
86 Cierra-A
82 Firenza-J
82-84 Omega-X
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 :rolleyes:

DEUCE .. Moderator :thumbup: 07-21-2012 06:16 AM

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? 07-21-2012 09:03 AM

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?

s10quint 07-21-2012 06:30 PM

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!!! 07-21-2012 06:35 PM

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

s10quint 07-21-2012 07:02 PM

Not sure. That's why you need the wiring diagrams. It'll take the guess work out of it.

Deuce 07-21-2012 10:22 PM

You hook it to the brake booster ... not the carb. :D :D 07-22-2012 12:01 AM

So you dont have to get the vacuum out of the engine? Just plug it off orr what?

Deuce 07-22-2012 08:27 AM


Originally Posted by (Post 1575867)
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.

:) 07-22-2012 10:28 AM

Okay! do you know anything about wiring one up deuce?? And running a relay or fuse for it?

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