GL1100 Rear Rotor


Information and questions on GL1100 Goldwings (1980-1983)
Post Reply
Spickler
Posts: 7
Joined: Thu Nov 28, 2019 2:30 pm
Location: United States
Motorcycle: 1982 GL1100I

GL1100 Rear Rotor

Post by Spickler »



I have a 82 GL1100I That is having some rear brake problems. I've decided to replace the rear rotor. [Hopefully that's the problem] Trying to get opinions on going OEM or aftermarket. I assume that all 82 1100s have the same rear rotor. Maybe someone has one lying around they want to get rid of on the cheap?


User avatar
WingAdmin
Site Admin
Posts: 22236
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: GL1100 Rear Rotor

Post by WingAdmin »

Spickler wrote: Sun Dec 08, 2019 1:18 pm I have a 82 GL1100I That is having some rear brake problems. I've decided to replace the rear rotor. [Hopefully that's the problem] Trying to get opinions on going OEM or aftermarket. I assume that all 82 1100s have the same rear rotor. Maybe someone has one lying around they want to get rid of on the cheap?
No, they are not the same. For instance, the brake calipers and rotors of the 1982 Aspencade are not used on any other year or model of bike. They are true orphans.

You have an Interstate, so make sure you are getting a rotor that matches the rotor on your Interstate.
User avatar
newday777
Posts: 2146
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: GL1100 Rear Rotor

Post by newday777 »

Spickler wrote: Sun Dec 08, 2019 1:18 pm I have a 82 GL1100I That is having some rear brake problems. I've decided to replace the rear rotor. [Hopefully that's the problem] Trying to get opinions on going OEM or aftermarket. I assume that all 82 1100s have the same rear rotor. Maybe someone has one lying around they want to get rid of on the cheap?
As you have the Interstate you can use one off an 82 or 83 Interstate or the naked GL1100, both use the same rotors.

As WingAdmin said the 82 & 83 Aspencade is different, they have a vented rotor that is thicker and will not go in your caliper and caliper mount.

Honda has long discontinued the rotors for all GL1100 models and years.

EBC still offers a rear rotor for your Interstate.
Just not cheap, but new.

https://www.jpcycles.com/product/zz2474 ... 233a08bb03
Spickler
Posts: 7
Joined: Thu Nov 28, 2019 2:30 pm
Location: United States
Motorcycle: 1982 GL1100I

Re: GL1100 Rear Rotor

Post by Spickler »

Thanks for the info guys, Looks like that's what I'll end up doing. While Ebay rotors are around and cheaper i can't be sure they are better than my current one.
User avatar
newday777
Posts: 2146
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: GL1100 Rear Rotor

Post by newday777 »

What is the problem you are having????
Spickler
Posts: 7
Joined: Thu Nov 28, 2019 2:30 pm
Location: United States
Motorcycle: 1982 GL1100I

Re: GL1100 Rear Rotor

Post by Spickler »

newday777 wrote: Tue Dec 10, 2019 12:35 pm What is the problem you are having????
I need to pump the brakes before it actually grabs and slows me down. I've bled the lines with a vacuum several times, but I've read other posts that suggest it might be the rotor being warped or out of spec. It ran with a side car for 3 years so I'm betting it was pretty tough on the brakes. I recently sold the sidecar so I'm looking to make some upgrades with the $, first being the ability to stop.
User avatar
newday777
Posts: 2146
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: GL1100 Rear Rotor

Post by newday777 »

From your description, it's more likely in the bleeding not the rotor, unless the rotor is too thin. Measure it with a micrometer. My bet is the bleeding.
Was the master cylinder dry/empty?
Start at the master cylinder banjo bolt/flare fitting as a bleed point as you would at the caliper several times to ensure there is no air there, then manually bleed at the caliper. A vacuum pump is good to flush. Bleeding must be finalized manually.
Spickler
Posts: 7
Joined: Thu Nov 28, 2019 2:30 pm
Location: United States
Motorcycle: 1982 GL1100I

Re: GL1100 Rear Rotor

Post by Spickler »

It seems like the rotor is too thin, i bled several times and the MC was never below the low level line. The last time i did it i tied the brake open with a zip tie over night and the next day it was solid, but within a few miles i was back to pumping. I haven't dug out the micrometer but the rotor is severely worn (just eyeball measuring). I may end up getting new lines, pads, and a new rotor.


Post Reply