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Old 12-11-2006, 08:46 AM   #1
Bus Nut
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Join Date: Nov 2003
Location: Whidbey Island, Washington (USA)
Posts: 465
Welcome aboard Blaines!

Hang in there; I've seen this topic come up before and hopefully one of the folks that know these brake systems will chime in here. Sorry I can't give you any clues as I have air brakes on my buses.

Les Lampman
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Old 12-13-2006, 02:29 AM   #2
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Join Date: Feb 2004
Location: Idaho
Posts: 448
I have a 1990 Chevy with a Detroit 8.2. I also have hydraulic brakes. These chassis came with some different brake systems. My bus has the Bendix system. Check out link to the PDF file and see if that is the system you have. You can also call a GM dealer to look up the VIN and find out what system you have.

You will find everything about the sytem in the link to the PDF file i attached. If you don't know how old the fluid in your system is do yourself a favor and replace the fluid before your master cylinder gets pitted and the seals start leaking. That cost me some money and time that I did not have to spare. ... 206602.pdf
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Old 12-14-2006, 09:56 AM   #3
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Join Date: May 2006
Location: mid Mo.
Posts: 886
Year: 1976
Coachwork: bluebird
Chassis: F33695
Engine: 427 chevy converted to 466
Rated Cap: 84

how about this???? your battery is dead and your vaccum motor won't run so you don't have any brake boost vaccum and that makes the light come on. sportyrick
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Old 12-14-2006, 06:59 PM   #4
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Well your battery sure isn't doing you any favors though I can't say that is the brake problem. It might just not have enough power to energize the starter solenoid though. A resting battery should show roughly 12.6 volts when fully charged though this does vary by .2 volts from manufacturer to manufacturer. You can test the new battery, but most battery testers, especially the high quality carbon pile load testers, need a full charge to test that battery and if it isn't taking a charge you can pretty well assume it's shot.
Skooling state at a time...
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Old 12-16-2006, 05:25 PM   #5
Bus Nut
Join Date: Feb 2004
Location: Idaho
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If you read the manual that I posted the link to you would know everything you need to know about the brakes. Here is the link again. It even shows all the electronic circuits. ... 206602.pdf
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Old 12-16-2006, 09:56 PM   #6
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Glad to hear you got it started. But if your battery voltage is that low when not running, you shouldn't try starting it too many times on it. Low voltage can damage your starter.
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