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Re: [GMCnet] Brake Mystery [message #132830]

Thu, 30 June 2011 15:17

Messages: 1262
Registered: September 2009

Karma: 0

Senior Member

I'm confused about master cylinder sizes. According to this page:

http://gmcmotorhome.info/master%20cyl.html

the OEM MC bore is 1 1/8". It lists Raybestos MC39075 and Wagner F79821 as 1 1/8" OEM replacements.
However, when I look those part numbers up, they are consistently described as having 1 1/4" bores.

So is the OEM MC really 1 1/8" or 1 1/4" ??

There are lots of 1 1/8" MC's available, including Wagner F101267 or Raybestos MC39009.
The 1 1/8" MC's are shown as being for a Chevy C20 with 11" brakes. The 1 1/4" MC's are for the
same vehicle but with 13" brakes.

Which is correct??

perplexed (as usual),

Karen
1973 23'
1975 26'

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Karen 1975 26' San Jose, CA

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