problem with front caliper gl1100


Information and questions on GL1100 Goldwings (1980-1983)
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sbaugz
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Location: Waukesha, Wisconsin
Motorcycle: 1983 gl1100 standard

problem with front caliper gl1100

Postby sbaugz » Thu May 08, 2014 8:18 am



1983 GL1100i

So I just changed my front tires and put the wheel and calipers back on. I am noticing a problem- not sure if the problem was there before changing the wheels or not. THe left caliper seems to move when I apply brakes- let me explain further. THis does not happen to right caliper. From what I can see, there is some movement at the upper mounting bolt that attaches caliper to the TRAC device. When I apply brakes, there is clearly a shift of the bracket relative to the bolt inside its mount by several millimeters. I tried pulling up the parts diagram on bikebandit to see if maybe there is a sleeve or something inside that needs to be replaced but I cannot find those parts on the diagram. Any thoughts? on the picture below, its the black bolt that attaches caliper to TRAC.



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virgilmobile
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Re: problem with front caliper gl1100

Postby virgilmobile » Thu May 08, 2014 9:26 am

Movement is normal when the brakes are applied with the wheel rotating...It pushes on a small spring loaded piston in the TRAX mechanism...It's suppose to control the hydraulics in that fork and reduce front end diving in a hard braking.
Download a manual from the "Manuals" section for more details.

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WingAdmin
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Re: problem with front caliper gl1100

Postby WingAdmin » Thu May 08, 2014 9:48 am

If it's rotating on the pivot when braking with the wheel rotating, then yes, it's the TRAC anti-dive mechanism at work. If it is moving (or sliding) laterally when braking (whether or not the wheel is rotating), then it's possible you have a stuck or seized caliper slider pin.

sbaugz
Posts: 6
Joined: Thu Apr 03, 2014 8:50 pm
Location: Waukesha, Wisconsin
Motorcycle: 1983 gl1100 standard

Re: problem with front caliper gl1100

Postby sbaugz » Thu May 08, 2014 6:39 pm

So i checked both calipers and none of the sleeves on either one seem to be seized,. In the meantime, I took a video. This shows the right side caliper and how I am able to move it front to back with my hand. This is exactly what is happening to the left front caliper when I actuate the front brakes while driving. The caliper slides forward somewhat. Maybe that is the TRAC doing its job?

The other thing I just discovered, is that the front master and front brake lever only goes to the left side caliper. The right front caliper goes directly to the rear brake master and doesn't connect at all to the front master. I am assuming this is correct? I guess I assumed the front brake lever controlled both front calipers but that does appear to be the case. I guess that would explain on my initial question above why the caliper only appeared to be shifting forward under braking on the left and not the right. That is because I was only using the front brake while testing this. So maybe this problem is solved? thoughts?

On a side note- these rubber boots around the caliper mounting bolts seem to be toast. Where is the best (ie, cheapest) place to get all these as replacements?

Here is a link to video below of me showing you what the caliper on the left was doing while applying front brakes. '

http://s1043.photobucket.com/user/sbaug ... a.mp4.html


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WingAdmin
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Re: problem with front caliper gl1100

Postby WingAdmin » Fri May 09, 2014 10:28 am

The movement you are showing is the TRAC mechanism in action. When you get onto the brakes, the caliper shifts like you're demonstrating. This actuates a valve inside the TRAC mechanism that restricts the oil flow inside the shock, so the bike resists "diving" under braking.

As for the left/right caliper, what you're describing is correct - the front lever actuates one front caliper, and the rear brake actuates the other front caliper and the rear caliper. This was done first on the 1983 model of GL1100, and on every Goldwing since.

You might be able to find the rubber boots at http://partsnmore.com




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