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Old 07-10-2017, 09:22 PM   #1
macdaddy70
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Join Date: Aug 2013
Location: Gluckstadt, MS
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out with the old, in with the new

Hello everyone. I recently posted under another thread, but wanted to get some pics of my truck posted. 1970 lwb GMC with 307 and 4 speed with granny low. Recently started making some changes as shown. Changed out radiator. (went with Champion brand), heater core, and master cylinder (have not connected due to being 95 degrees down here. Powder coated the original steel rims and put on some new tires. I have also removed the bed and pressure washed the frame of 20 years of Mississippi red dirt, primed and painted. After installing master cylinder over weekend, I am not getting any fluid to the rear axle. Got tired of troubleshooting and will start on it again this week. Plan is to get it running and safe. After the brakes are fixed I plan on enjoying a little while before tackling any other big projects. NEEDS -rockers, 1 cab corner, which hopefully will be tackled within the year. Just wanted to say this is a great site and helped tremendously when doing these projects.
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Old 07-10-2017, 09:47 PM   #2
AussieinNC
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Re: out with the old, in with the new

Your no fluid to rears is caused by the brake fail switch being tripped in the proportioning valve. This is the valve block under the master cylinder...remove the small electrical screw in switch and you will hear the valve click back to center...leave the valve out while you bleed the system, then put is back in when you are done.

Bleed passenger side rear, drivers side rear, passenger side front, then drivers side front...a pressure bleeder makes is much easier...

Hope this helps...Bill
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Old 07-11-2017, 12:25 AM   #3
toolboxchev
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Re: out with the old, in with the new

Very informative on the brakes Bill. I learn something everyday on this site from the guys that make it great.

I thought at one time I was pretty good on the old technology, yet there is always something new!
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Old 07-11-2017, 06:20 AM   #4
macdaddy70
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Re: out with the old, in with the new

Thanks for the info. I will try that.
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Old 07-11-2017, 08:57 AM   #5
LockDoc
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Re: out with the old, in with the new

-
If you haven't replaced the rear rubber brake line you might want to consider that too. They can deteriorate inside and pieces of the lining will flake off plugging the line.

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Old 07-11-2017, 09:43 AM   #6
Drummerboy
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Re: out with the old, in with the new

Man I'm glad I click on this post. I had a rear rubber brake line fail on my '68 Friday evening and of course my brake light comes on when I depress the pedal. I'll have to remember to do what AussieinNC said to do about the brake fail switch being tripped. I'll E replacing all of my runner lines this week. Thanks!
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Old 07-17-2017, 07:28 PM   #7
macdaddy70
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Re: out with the old, in with the new

Well I never was able to get my brakes to work right. I finally broke down and took the old girl to a local mechanic. I now have brakes. I knew I had to put shoes on the rear, but per them the new master cylinder that I had installed was not working properly, 2 wheel cylinders were bad, and one rubber line. I am officially out of any play money i had, so hopefully I can just drive it and enjoy it for a while without stressing over what I can do to it next.
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Old 07-17-2017, 08:03 PM   #8
Drummerboy
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Re: out with the old, in with the new

Quote:
Originally Posted by macdaddy70 View Post
Well I never was able to get my brakes to work right. I finally broke down and took the old girl to a local mechanic. I now have brakes. I knew I had to put shoes on the rear, but per them the new master cylinder that I had installed was not working properly, 2 wheel cylinders were bad, and one rubber line. I am officially out of any play money i had, so hopefully I can just drive it and enjoy it for a while without stressing over what I can do to it next.
May I ask what he charged you?
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Old 07-17-2017, 08:09 PM   #9
Mike C
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Re: out with the old, in with the new

My guess is when you threw the MC on the truck you had not bench bled it first?

Nice looking project truck!
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Old 07-17-2017, 08:56 PM   #10
macdaddy70
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Re: out with the old, in with the new

He charged $350.
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Old 07-17-2017, 09:12 PM   #11
s10mk
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Re: out with the old, in with the new

X2, I really like your truck!
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Old 07-17-2017, 10:21 PM   #12
lil hoodlum
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Re: out with the old, in with the new

Wow! Great looking truck, love the color!
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