sudden breakdown of the rear brake


Information and questions on GL1100 Goldwings (1980-1983)
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imadamine
Posts: 18
Joined: Sun Aug 09, 2015 6:14 am
Location: lebanon
Motorcycle: 1981 GL1100I Interstate

sudden breakdown of the rear brake

Postby imadamine » Sun May 01, 2016 4:28 pm



Hi guys,

Today during my ride in my GL1100I 81 suddenly after a long ride with lots of up and downs and tight curves! I pressed the rear brake to suddenly feel I lost the pedal!! I looked it was there but as if it is not connected!! However I stopped wait couple of hours, it was working but at an extremely very low efficiency, I checked the brake oil level it was way below the low dash.

And I would like to note that more than a month ago I started realising that after a maximum of 1 hour riding the rear brake loosen a bit and the efficiency of the braking is weak but not like today.

What could be the problem?



User avatar
chrisz
Posts: 77
Joined: Thu Jun 18, 2015 8:19 pm
Location: Cambridge Ontario
Motorcycle: Honda GL1100 year 1983
Triumph Tiger 1050 year 2008

Re: sudden breakdown of the rear brake

Postby chrisz » Sun May 01, 2016 4:48 pm

If you are losing brake fluid, it would appear to be a leak somewhere. Did you look for a leak? When you had diminished braking a week ago, what did you do to improve it for this last ride? Will need more details, otherwise take it to a mechanic and stop riding it with bad brakes.

imadamine
Posts: 18
Joined: Sun Aug 09, 2015 6:14 am
Location: lebanon
Motorcycle: 1981 GL1100I Interstate

Re: sudden breakdown of the rear brake

Postby imadamine » Mon May 02, 2016 1:04 am

There is no brake fluid leak thats i'm sure about, but I also forgot to mention I never checked the brake fluid level :? .
I'm taking it to the mechanic but I would like to have some ideas because the mechanics in my country are very ignorant.

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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: sudden breakdown of the rear brake

Postby Aussie81Interstate » Mon May 02, 2016 2:52 am

It could be the master cylinder needs to be rebuilt - maybe the cup has degraded - or worse you have a leak somewhere.

worst case scenario - new/replacement master cylinder - rebuild your old one - put new brake hoses on - or just a simple flush and replace with new fluid might be the issue.

Good luck -but please get it sorted out. :)

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RBGERSON
Posts: 2612
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: sudden breakdown of the rear brake

Postby RBGERSON » Mon May 02, 2016 8:35 am

Pads rubbing..heating up the caliper boiling off fluid..when cold it works after riding it's not??? that's a heating up issue most likely..try touching the disk after riding for awhile but be careful it could be VERY HOT!!!
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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maintainer
Posts: 291
Joined: Sun Mar 22, 2015 11:39 am
Location: Houston, Texas
Motorcycle: 1977 GL 1000
1982 GL 1100 Interstate (Sold)

Re: sudden breakdown of the rear brake

Postby maintainer » Mon May 02, 2016 8:48 am

Just rebuild the caliper, master cylinder & clean return hole, install new pads, remove and service rear pedal (clean and regrease pivot shaft) and reinstall.

If the system is full of **** (petrified fluid) also clean out brake line, all cavaties, and bleeders.

Sounds worse than it is, and your rear brakes will be like new afterwards.


1982 GL 1100 Interstate SOLD
1977 GL 1000 Standard (naked can be good, who knew?)


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