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Brake Servo Retrofit

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Brake Servo Retrofit Empty Brake Servo Retrofit

Post by David B Tue Apr 05, 2016 7:08 pm

AH with 377 short block chevvy and GM700R4 automatic transmission. Am considering having a power brake servo installed on braking system, the engine tends to overpower the car particularly on start up with automatic choke. Anyone know of a good garage in New York City area, NJ or CT?

David B

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Join date : 2014-10-26

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Post by Hotrod Tue Apr 05, 2016 9:25 pm

Before you go very far on this, you need to check the vacuum that your engine is pulling. You need at least 15-16 inches to reliably power a brake servo.

If your cam is fairly stock and the engine is in good tune, you should have decent vacuum. If you have a "lumpy" cam, you probably don't have enough.

Find a vacuum test gauge and hook it up to a constant manifold vacuum port.
Hotrod
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Post by David B Tue Apr 05, 2016 10:37 pm

Thanks for advice, will check.

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Post by Jimboquick Thu Apr 07, 2016 6:09 pm

Is your ride set up with 9" Pinto Front disc brakes and Maverick rear drum brakes { like a FoMoCo 8" rear axle ass'y.}??
That's what I had to improve on ... I think I've still got part numbers around here. Please let me know.
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Post by David B Thu Apr 07, 2016 7:35 pm

Upgraded brakes to Wilwood Dynalite four piston discs and calipers on rear, SSBC four piston front with drilled and slotted rotors and calipers.
Have to step on brakes to stop car, figured power brakes would help.

David B

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Post by Jimboquick Fri Apr 08, 2016 11:26 am

The parts[Master cylinder and dual 8" diaphragm booster] used on our MX were for drum rear brakes ... wouldn't work for you. Sorry 'bout that.
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Post by David B Fri Apr 08, 2016 11:34 am

Thanks JQ
I just finished looking back through the old records for the car and apparently an electric brake vacuum booster system was installed back in 2010.....previous owner could have taken it off when upgrading the brakes.....will check...

David B

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Post by David V. Fri Apr 08, 2016 5:14 pm

Hey guys, since this is more of a technical issue I moved the thread to the "Tech Questions" section of the forum. Good luck with sorting the problem out!

Cheers!

David
David V.
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Post by Jimboquick Fri Apr 08, 2016 5:38 pm

Thanks, Dave ... hope you have a great weekend. We're heading down-river to Amherst Island {not the MX though, it's way too cold} to see an old friend.
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Post by David V. Fri Apr 08, 2016 5:40 pm

Hey Jim is that Amherst Island in lake Ontario? Near Kingston?
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Post by Jimboquick Fri Apr 08, 2016 5:51 pm

Yessir !
J

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Post by David V. Fri Apr 08, 2016 5:54 pm

Nice! My parents actually live quite close to there. I'm in Montreal right now, but if you go that way again this summer and let me know a few weeks in advance we could take the Sebrings for a cruise. If my engine works that is Razz
Have a good time!
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Post by Jimboquick Fri Apr 08, 2016 6:04 pm

Possibilities ?
J

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