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DaveO430 04-27-2015 10:24 AM

GL1100 rear master cylinder upgrade
A lot of times the rear master cyl on old bikes is bad and unrepairable and you can't get a new one. I have found a solution. I bought one for a Valkyrie off eBay and made it fit the 1100. This was done with the fuel tank out, but should not be a problem with it in place.

The Valk MC has bolt holes already the proper size to tap to 8x1.25 for the original bolts.

I then mounted it to the frame in the OE rear bolt hole and the upper hole in the MC with a spacer 3/8" long w/8mm hole.

I then made a bracket of 1/4 x 3/4 steel with 8mm holes 1" C to C to fit from the OE front hole to the lower hole in the MC.

Bracket mounted to MC with 8x1.25 allen head screw.

Mounted to frame with OE bolts, a nut is used on the back side of the bracket, could have tapped threads in it but didn't think of it in time.

2 washers were used to space the bracket out from the frame for alignment.

Had to work up a little slack in the brake line to get it to curve around to clear the swing arm. A new SS braided line would be a good thing.

The OE supply hose is too short. You will have to get a 3/8 hose compatible with brake fluid, 3/8 is a little tight on the OE reservoir and loose on the MC fitting but will work. Didn't even have to adjust the rod length for pedal height.


AZgl1800 04-27-2015 10:30 AM

876 Attachment(s)
Dave, a great find........

can you fix the missing photos ??

DaveO430 04-27-2015 10:38 AM

What's missing?

AZgl1800 04-27-2015 11:45 AM

876 Attachment(s)
about half of the pictures have bad links, something is askew linking to your photobucket account.

I went direct to your page at project?sort=3&page=
and the pictures are good, they just don't show up for me in your post.

The pictures at #s 1, 2, 3, 5, say "Photo not found"

I would fix it, if I knew which picture belonged at each spot....

DaveO430 04-27-2015 03:53 PM

I see all of them when I open this thread, may wait and see if anyone else doesn't.

AZgl1800 04-27-2015 04:04 PM

876 Attachment(s)
I just looked with IE and Chrome, pix not there

DaveO430 04-27-2015 04:26 PM

When I opened the tread this time they were in fact gone, I replaced them. Was going to put them in the gallery and post them from there but I can't find them in my computer and already deleted them from my camera.

Bike...and Dennis 04-27-2015 05:13 PM

I see ten photos.

AZgl1800 04-27-2015 05:16 PM

876 Attachment(s)

Originally Posted by Bike...and Dennis (Post 3938202)
I see ten photos.

Dave fixed it already, and I also see all of the photos.

77Pinto 04-28-2015 06:02 AM

Not for 83s I assume.....


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