LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

installed cc306 now brakes suck

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Old 09-17-2004, 05:30 PM
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installed cc306 now brakes suck

i am guessing because of vacum..anyway to fix them
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Old 09-17-2004, 05:34 PM
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Re: installed cc306 now brakes suck

Good question...I havnt tested mine yet.. EEK.

Brakes suck bad? or just a little worse?
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Old 09-17-2004, 05:52 PM
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Re: installed cc306 now brakes suck

well for me they are pretty bad...i have to put both feet on the petal or pump them to stop quick. i dont have abs and cant even lock up the tires
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Old 09-17-2004, 06:05 PM
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Re: installed cc306 now brakes suck

Thats reassuring.. any vacum leaks that you know of???
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Old 09-17-2004, 06:28 PM
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Re: installed cc306 now brakes suck

If manifold vacuum is to low you can install a vacuum tank. It will solve the braking problems. Does it feel OK at high rpms but bad at low rpms? If so jut install a tank.
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Old 09-17-2004, 06:37 PM
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Re: installed cc306 now brakes suck

I can't even tell the differance after my install. like the previous post said.......Is it only at low rpm's or high and low? Make sure the rubber grommets on the booster and intake are in good shape. I would bet it's a leak somewhere. JMO

Last edited by 30696bird; 09-17-2004 at 07:13 PM.
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Old 09-17-2004, 08:13 PM
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Re: installed cc306 now brakes suck

check for leaks, i have a cc306 with ported heads and i have great brakes
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Old 09-17-2004, 09:44 PM
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Re: installed cc306 now brakes suck

does that vacume hose that comes out of where the fuel lines are do anything? also i dont have the air pump any more, but i am pretty sure that doesnt do anything
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Old 09-18-2004, 01:18 AM
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Re: installed cc306 now brakes suck

evap canister
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Old 09-18-2004, 02:23 AM
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Re: installed cc306 now brakes suck

There is a vacuum line that runes from the intake manifold to the brake booster. Is it there and is it in good condition?
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Old 09-18-2004, 04:02 AM
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Re: installed cc306 now brakes suck

A.I.R. pump has nothing to do with vacuum or brakes. It is there to help with emmisions. I no longer have mine either, like I said I have grreat brakes.
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Old 09-18-2004, 05:51 PM
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Re: installed cc306 now brakes suck

i got the car back today, and the brakes are only bad when i am ideling, if the rpms are up they work as good as before.

off topic but it is my post
what RPM do those of u with the 306 idel at in gear and in park?
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Old 09-18-2004, 05:53 PM
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Re: installed cc306 now brakes suck

I had Ion tune my for 900 in gear...... 925 in park.
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Old 09-18-2004, 07:20 PM
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Re: installed cc306 now brakes suck

My brakes suck too. Similar cam to 306. Just low vacuum at idle. I pull barely 10 inches. Get a Jegs or Summit brand vacuum canister. They're inexpensive ($50 or so) and do wonders for braking ability.
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Old 09-18-2004, 07:21 PM
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Re: installed cc306 now brakes suck

I got my brake booster hooked up tonight. My brakes are awesome..those with sucky brakes need to check for vacuum leaks!!!!!
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