Brake Pad Hanging Up


Information and questions on GL1100 Goldwings (1980-1983)
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triketrash
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Brake Pad Hanging Up

Postby triketrash » Thu Mar 13, 2014 12:25 pm



After changing pads, I'm having a lot of noise and some telltale heating up of the left front rotor. I'm pretty sure the caliper is ok but..... I had the wheel off and when I put it back on, I had a heck of a time getting the distance between the left caliper mount and the rotor to be greater than .7 mm on the outside. I loosened the axle holder nuts and got the fork as far out as I could, but it was still a little under the .7 mils. Seems like you can only move the fork out on the axle so far, because it then is up against the axel nut. Any ideas?



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triketrash
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Re: Brake Pad Hanging Up

Postby triketrash » Thu Mar 13, 2014 12:51 pm

You know, the other thought I had on this is just going back to the old pads on that side if I can't get the tolerance right for whatever reason. I wasn't having any trouble til I put the new (thicker) pads in.

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WingAdmin
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Re: Brake Pad Hanging Up

Postby WingAdmin » Thu Mar 13, 2014 3:17 pm

If it's a little under .7 mm and the wheel is rotating fine without contacting the bracket, then I wouldn't worry about it.

Thickness of the pads will have nothing to do with this measurement - the caliper slides independently in and out on the bracket to account for pad wear. As long as the piston(s) are retracted sufficiently and the pads installed correctly around the rotor, the caliper will find its own center after the first couple of brake applications.

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triketrash
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Re: Brake Pad Hanging Up

Postby triketrash » Thu Mar 13, 2014 4:31 pm

You know Scott- you're absolutely right (as usual.) I tried putting some thinner pads in there and still have the problem. Well what's my problem then. There is some clearance there, just a tad under .7 on the outside, and that's definitely where the pad is binding, as evidenced by the hot rotor, and I can hear it when I turn the wheel by hand. So you think the small gap may just be a red herring and my real problem is that the piston isn't retracting?

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offcenter
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Re: Brake Pad Hanging Up

Postby offcenter » Thu Mar 13, 2014 5:58 pm

I'm guessing that the piston and cylinder have some corrosion.
You are probably overdue for a brake rebuild.
I had this problem with my '76. Polishing the piston and cylinder
with really fine emery paper, then installing new seals, cured
the problem. It retracts fine now.
George in Jersey.
99 Goldwing GL-1500 SE
76 Goldwing Gl-1000
77 Honda CT-90 "Trail 90"

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triketrash
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Re: Brake Pad Hanging Up

Postby triketrash » Thu Mar 13, 2014 7:10 pm

ya maybe I'm barking up the wrong tree with this rotor/ caliper clearance thing. Well how about this: what WOULD happen if the clearance was say .3 mm- no contact between rotor and bracket, but significantly below the minimum clearance.

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Re: Brake Pad Hanging Up

Postby WingAdmin » Fri Mar 14, 2014 9:44 am

triketrash wrote:ya maybe I'm barking up the wrong tree with this rotor/ caliper clearance thing. Well how about this: what WOULD happen if the clearance was say .3 mm- no contact between rotor and bracket, but significantly below the minimum clearance.


Nothing. As long as the rotor doesn't hit the bracket, there is no issue.

You likely either have bound up caliper pins that aren't sliding, or (more likely) the piston isn't fully retracting, and the caliper needs to be rebuilt.

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triketrash
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Re: Brake Pad Hanging Up

Postby triketrash » Fri Mar 14, 2014 1:34 pm

OK- thanks Scott- I'll do the rebuild:) There are no caliper pins on these older brakes- the pads just sit loosely in there.

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Re: Brake Pad Hanging Up

Postby WingAdmin » Mon Mar 17, 2014 11:02 am

triketrash wrote:OK- thanks Scott- I'll do the rebuild:) There are no caliper pins on these older brakes- the pads just sit loosely in there.


By caliper pins I'm not talking about the pad retainer pins, I'm talking about the pins that the caliper slides back and forth on - the bolts that you use to fasten the caliper to the caliper bracket. If you look closely, you will see that the caliper can actually slide back and forth on those bolts, which is why they a) need to be greased, and b) have rubber seals/bellows to keep the grease viable.

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triketrash
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Re: Brake Pad Hanging Up

Postby triketrash » Mon Mar 17, 2014 5:38 pm

OK gotcha- well yes I did grease those, but sounds like it wouldn't be a bad idea for a guy to fill up the bellows with grease too?

Well anyway, I had the wheel off one more time, remounted it and checked the rotor/ bracket clearance again. It looked even smaller on the outside, but since you said it doesn't really matter as long as there's no contact and I was ready to call it a day anyway, I just bolted everything back up. I was resigned to ordering a caliper kit and redoing both sides and then I rode the bike back to the hangar- guess what? - no squealing, heating up of the rotor. I don't know how it happened, but it seems to have fixed itself. I'll keep an eye on it, but at this point, I'm happy with it. Rode to work today- no issues. Thanks again:)




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