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  #71  
Old 12-04-2012, 03:18 PM
spectre6000 spectre6000 is offline
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I THINK I have it narrowed down to either the brake booster, or the hose from the intake manifold to the brake booster. It builds vacuum fine at the pedal (insofar as I think it should... Never had this variety of brakes), and I can't hear well enough to trace it with the carb cleaner trick... If I had a second pair of hands, I could shut it off and play with the carb cleaner while it's the only thing audible. Are brake boosters prone to any known vacuum related faults?
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  #72  
Old 12-04-2012, 03:24 PM
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sometimes (somewhat often) the diaphragm can go bad. minitruck and FJ60 boosters are common and well-working replacements.
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  #73  
Old 12-04-2012, 03:29 PM
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Are they straight bolt in replacements?
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  #74  
Old 12-04-2012, 03:34 PM
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Quote:
Originally Posted by spectre6000 View Post
Are they straight bolt in replacements?
Yes! They can be different physical sizes so as long as the brake lines can move they should be a direct swap.
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  #75  
Old 12-04-2012, 03:37 PM
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Quote:
Originally Posted by spectre6000 View Post
Are they straight bolt in replacements?
Pretty much so however some are more straight forward than others. I have a 3rd generation 4 runner booster; the larger diameter covers one of the bolt holes for my clutch master. Some mini-truck boosters have a spacer that you want to bring over. IIRC, Subzali is running an FJ60 booster which was a straight forward swap.

With any replacement, you will want to take the extra step of checking the pushrod depth to insure it is correct. If it is not correct it will result in the brake hydraulics constantly building pressure and lock the brakes solid after a few stops.

Generally, these brake boosters are very reliable. To test it, use a vacuum pump to build about 15 and see that it holds for a half hour. If the booster passes that test, your issue is likely a faulty check valve or crack in the hose going to the manifold.
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  #76  
Old 12-04-2012, 03:44 PM
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FJ60 booster is easy, just have to mount it upside-down and cut pushrod to proper length!
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  #77  
Old 12-04-2012, 04:00 PM
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the runner booster has more boost than the 60 booster.

I swapped my 60's booster and noticed a big difference. they bolted up the same too.

do the carb cleaner trick with it actually running and spray it all over till you find the leak. places to check are around vacuum lines/fittings, around the carb, and around the head to manifold interface.
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  #78  
Old 12-04-2012, 04:53 PM
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Part of my problem is that it doesn't seem to affect idle at all, and all I have to go on is a hiss. When I shut it down it's very obvious, but I can't get around the a-pillar with the carb cleaner fast enough to catch it... I'm going to give it another try as soon as I get home from picking my wife up at work (we're down to one car until I get this pig on the road). A second set of hands and hopefully a little daylight will go a long way... Wish me luck and hope it's a hose or some other minor thing instead of the booster itself.
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  #79  
Old 12-04-2012, 06:09 PM
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Finally got a helper! Fired it up, and it more or less immediately ran out of gas... Clogged fuel filter. I bought extra elements when I got the filter, so it won't take much, but that's still a real kick in the teeth. It's dark now, and too cold for functional fingers (let alone fingers drenched in gasoline), so I'll have deal with it tomorrow... Tomorrow is the last warmish day of the year from the looks of it, so hopefully I can get it good!
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  #80  
Old 12-04-2012, 06:32 PM
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Does anyone know any radiator shops in the area that will do gas tanks?
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