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[GMCnet] Master Cylinder Pushrod Gauge [message #197731]

Thu, 07 February 2013 18:46

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

After many frustrating attempts over the years to accurately determine
the correct length for booster-to-MC pushrods, I finally gave up on
modelling clay a couple of weeks ago. I spent a few minutes making an
easy-to-use and accurate gauge for the purpose.

I just posted photos at:
http://www.gmcmhphotos.com/photos/g6289-master-cylinder-pushrod-gauge.html
or
http://goo.gl/Of6S8

The captions should enable anyone to make and use it.

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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Re: [GMCnet] Master Cylinder Pushrod [message #220095 is a reply to message #197731]

Tue, 27 August 2013 10:42

Messages: 1262
Registered: September 2009

Karma: 0

Senior Member

> emerystora wrote on Sun, 25 August 2013 10:42]Your 69mm (2.72") is close to the 2.63 inches that I and others have used. It is only 2.2mm more. However, make sure that you have enough clearance. If the piston doesn't return all the way you can get some residual pressure on the master cylinder and the brakes. I recommend 0.015 inches (3.8mm) clearance between the end of the push rod and the piston.

think you mean 0.38 mm. 3.8mm is about 0.15 inches, or roughly 10 times
what the clearance should be. The pushrod should be 1/4mm to 1/2mm shorter
than the space available between the MC and booster. (0.010 to 0.020 inches)

Karen
1973 23'
1975 26'

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Karen 1975 26' San Jose, CA

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