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post #1 of (permalink) Old 03-12-2004, 09:42 AM Thread Starter
 
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--->Power brakes vaccum line

I hooked up a used (but apparently working) power brake booster /bracket to my 82CJ7. I bought a rebuilt master cylinder, and used the tri-county gear brake rod.

The brakes DO NOT seem to be any better than before with manual brakes. Before I replace the booster ($$), I want to know if anyone can see a problem with my vacuum line hookup (PICTURE) or see any other problems. I hooked manifold vacuum to the booster basically.
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post #2 of (permalink) Old 03-12-2004, 09:58 AM
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Re: --->Power brakes vaccum line

You bench-bleed the MC first of course..
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post #3 of (permalink) Old 03-12-2004, 10:30 AM
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Re: --->Power brakes vaccum line

It should be hooked to manifold vacuum. I don't think you'll get enough from a carb port.
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post #4 of (permalink) Old 03-12-2004, 11:31 AM
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Re: --->Power brakes vaccum line

Is that a stock cj booster? The cj boosters aren't very good to start. They are a single diaphram which is why most people upgrade to a double from a chevy.

post #5 of (permalink) Old 03-12-2004, 11:36 AM Thread Starter
 
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Re: --->Power brakes vaccum line

I know I have seen the past posts regarding using a double diaphram booster, but thos posts say to use a different bracket.

Will the GM dual diaphram booster (for example from a 1990 Caprice) mount up to the stock CJ bracket?

I would be VERY surprised however if there was not something wrong with my setup or a non-functional part. The braking is almost equal to manual. I am not expecting tippie toe braking, but I at least expected SOME improvement, which I don't see so far.

Also, thanks for the tip about carb vacuum, I will attach to manifold vac and try that, I didn't think about that.
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post #6 of (permalink) Old 03-12-2004, 11:45 AM
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Re: --->Power brakes vaccum line

My cj is on 35s and I have the gm booster out of a 85 suburban. It didn't have the correct bracket to work but I fixed to so that it would mount to the stock bracket as a short term fix. Not really sure of which model cars to get it from.

I have some other issues that make my vacuum a problem. But with high rpms I can lock up the tires...
post #7 of (permalink) Old 03-12-2004, 01:05 PM
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Re: --->Power brakes vaccum line

I've read that the dual diaphram from an S truck works well.
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post #8 of (permalink) Old 03-12-2004, 02:05 PM Thread Starter
 
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Re: --->Power brakes vaccum line

Any pictures of the 85 Suburban booster setup?
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post #9 of (permalink) Old 03-12-2004, 07:43 PM
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Re: --->Power brakes vaccum line

This mess gets my vote for most disjointed thread in weeks. Care to start over ?

Or did you just take Will's advise and it now works? It should be manifold vacuum.

Ramble on !
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post #10 of (permalink) Old 03-12-2004, 10:16 PM
 
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Re: --->Power brakes vaccum line

Yes, bring the vac directly off the manifold. I am using a Dual booster I pulled from a mid 80's Cadillac; it required a little tweaking on my stock mounting bracket, but it's worked fine for two years.
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