Restoring an '81 GL1100. The rear master cylinder is WAY beyond repair. And as I'm sure you all know, rear master cylinders for the GL1100 are NLA. Does anyone know of a good reliable conversion using an available master cylinder? My guess is that a 14mm master cylinder will push the appropriate amount of fluid. My best guess is also that it is going to require fabricating some sort of bracket or plate with the correct bolt holes and such.
Any ideas? Thanks in advance!
1981 GL1100 Rear Master Cylinder Alternatives?
-
Banzaibob
- Posts: 7
- Joined: Mon Mar 06, 2017 9:00 pm
- Location: Kansas City, Mo
- Motorcycle: 1984 GL1200A, 2011 BMW R120RT, 1991 BMW R100RT, 1974 Honda CB750, 1977 Harley Davidson XLCR1000, 1959 Triumph TR6, 1971 BSA B50TT Honda FT/XL500, 1974 Suzuki GT750, 1969 Suzuki T350, 1971 Honda CB350 Diesel conversion,
-
grooviebastad
- Posts: 7
- Joined: Tue Mar 21, 2023 8:23 am
- Location: Vancouver, BC, Canada
- Motorcycle: 1980 GL1100 Interstate
Re: 1981 GL1100 Rear Master Cylinder Alternatives?
Just got into my "new to me" '81 Interstate last week. One of the PO's has swapped the rear master for one off of an '84 GL1200. Capped the outlet to the front right brake ('84 had integrated rear/front right from the rear master).
My father in-law was the last owner. He didn't do the swap, but said it ran and STOPPED great with this setup for years.
My father in-law was the last owner. He didn't do the swap, but said it ran and STOPPED great with this setup for years.
-
WTF
- Posts: 7
- Joined: Wed Apr 05, 2023 8:30 am
- Location: Tallahassee, FL
- Motorcycle: 1983 GL1100A Aspencade
2016 FZ 09
CR125 XR200 Hybred
Re: 1981 GL1100 Rear Master Cylinder Alternatives?
Were there any changes to the front MC?
I wonder if the front MC can push enough fluid to work both calipers if it is plumbed that way?
I wonder if the front MC can push enough fluid to work both calipers if it is plumbed that way?
-
grooviebastad
- Posts: 7
- Joined: Tue Mar 21, 2023 8:23 am
- Location: Vancouver, BC, Canada
- Motorcycle: 1980 GL1100 Interstate
-
WTF
- Posts: 7
- Joined: Wed Apr 05, 2023 8:30 am
- Location: Tallahassee, FL
- Motorcycle: 1983 GL1100A Aspencade
2016 FZ 09
CR125 XR200 Hybred
Re: 1981 GL1100 Rear Master Cylinder Alternatives?
Ooohhhh...grooviebastad wrote: ↑Mon Jun 05, 2023 10:15 am It's an '81, so it came that way from the factory. Front MC operates both front calipers.
I wonder what year they came up with the genius idea to plumb them backwards.
I am sure they had rider safety in mind.
I have a buddy that makes hoses for a living, I think I am going to run both fronts off of this one to see if it works.