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Old 07-02-2019, 07:51 PM   #1
Campbel45
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Join Date: May 2013
Location: Greenwood, IN
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GM/Delco Hy-power brake booster

Could anyone help me out on which brake port goes where? Forgot to take a look when I pulled this unit.

Also if you have a wiring diagram for what sets off the electric motor, that would be very helpful. I'm guessing its very similar to the hydromax units... In that:

#1. ign off, brake pressed - electric motor runs
#2. ign on, power steering no flow - electric motor runs
#3. ign on, brake fluid no pressure - electric motor runs

https://imgur.com/a/BvCQb9w


Last edited by Campbel45; 07-02-2019 at 08:02 PM.
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Old 07-05-2019, 02:25 AM   #2
Bob B.
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Re: GM/Delco Hy-power brake booster

I remember those systems, but never worked on them much. Your best bet would be to pick up an original GM service manual for your truck. Usually not too expensive on Ebay. Always useful to have when you own an old truck.
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Old 07-06-2019, 10:48 PM   #3
rkn463
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Re: GM/Delco Hy-power brake booster

Here you go. If the pictures are not readable let me know and I'll redo them.

-Richard
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Old 07-08-2019, 11:33 AM   #4
Campbel45
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Re: GM/Delco Hy-power brake booster

thanks rkn463!
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