| [GMCnet] GMC OEM MC [message #87694] |
Mon, 07 June 2010 17:35  |
Charles Aulgur
Messages: 78
Registered: March 2006
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Just passing along a little info I discovered many years ago.
When I bough our first GMC motorhome way back in 1985 from a person
who had his 500$ deposit down on a WMC and started looking at all the
GMC info he gave me,the major subject back then was about brakes same
as it has been for over two decades. First we had the article in
"Motorhome Marketplace Magazine" by Jim Anset on enlarging the mid
axle brake cylinders to 1-1/16 inch. Lots of people made the mod and
some like me went to 1-1/8". If a little is good why not go even
larger. Of corse it helped the GMC braking because those of us that
made the change wanted other people to also spent their $. The next
big improvement was going to 2-3/4 " wide shoes which I also
foolishly installed. People starter converting the rear drum brakes
to various types of disc brakes, most of them came from the "mens
maul" and some tried numerous different types of MCs. When Carbon
Friction came out with the CM front brake pads we started seeing some
real improvements. Then people found it was easy to convert to 80mm
calipers on the front brakes. When I got to that point I started
having problems with the MC not displacing enough brake fluid for all
the extra volume I had added to my brake system. I had a friend in
San Diego who had made all the same changes to his GMC and was not
having any problems. The difference in our two brake systems was he
had an OEM MC and I had an after market one. We decided to take the
two apart and see if they where different in some way. To our
surprise, the OEM MC had approximately 1/8" longer stroke then my
after market one and that was why his brake system worked and mine
didn't. Everyone said that that could not be true because all the
experts had said they we identical. We bought a new MC from Cinnabar
and several after market brands and took them apart and we found the
same difference as we found previously. My friend keep the OEM MC as
a spare. I was to cheep to by a new Cinnabar MC so I cut 1/8' inch
off of the front end of the front piston stop on my Bendix AM MC and
it worked fine for many years until I installed the P-35 MC that came
with the Applied GMC disc brake kit when I changed my rear drum
brakes to disc brakes, So we concluded that all MC for the GMC are
not the same.
Chuck Aulgur
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