Brake Caliper Oddity


Information and questions on GL1100 Goldwings (1980-1983)
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lowmanj
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Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
Motorcycle: 1981 GL 1100 Interstate

Brake Caliper Oddity

Postby lowmanj » Mon Jan 24, 2011 7:47 pm



Do it yourself article depicts rear brake caliper with double pistons.
My '81 has a single piston, no hardware to retain pads, and reads NISSIN instead of Honda.

What do I have?
Also, the piston won't come out. It soaked many days with penetrating oil. It won't depress with clamp, and air pressure has no effect.
Any tips?
Thanks



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MJSantos
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Re: Brake Caliper Oddity

Postby MJSantos » Mon Jan 24, 2011 8:57 pm

Looked it up in the parts manual and 1981 was the last year for the single piston calipers. Another way to gat the pistons out when they're that bad is to back the bleeder screw out to open the valve, then use a grease gun. The bleeder is almost the exact size of a zerk fitting pump the caliper full of grease. It's a nasty way to do it but it will move them.

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
Motorcycle: 1981 GL 1100 Interstate

Re: Brake Caliper Oddity

Postby lowmanj » Mon Jan 24, 2011 10:52 pm

Thanks very much. Messy is OK. Good tip. I'll let you know how it works.

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thrasherg
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Re: Brake Caliper Oddity

Postby thrasherg » Tue Jan 25, 2011 3:59 pm

Do be exceedingly carefull using compressed air to force the piston out, when that piston finally moves it will come out like a speeding bullet and will do a ton of damage to anything near by (fingers, face, walls, etc). As mentioned either reconnect the master cylinder and just pump brake fluid in until the piston is forced out or use a grease gun, but compressed air should be a last ressort and (if used) at very low pressure!!

Gary

lowmanj
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Joined: Thu Dec 30, 2010 7:42 pm
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Motorcycle: 1981 GL 1100 Interstate

Re: Brake Caliper Oddity

Postby lowmanj » Tue Jan 25, 2011 7:47 pm

Thanks Gary. Grease gun is only way then. Master cylinders are torn down too. 7 years in storage did a damn damn on the brakes.
Jesse

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WingAdmin
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Re: Brake Caliper Oddity

Postby WingAdmin » Thu Jan 27, 2011 10:36 pm

If you put a flat piece of steel welding stock in place of the pad, when the piston pops out of the cylinder, it won't go anywhere, because the steel will stop it. Just a little safety precaution. Also a good way to get two-piston cylinders to come out if one is seized - keep pumping, and when the good (or less seized) piston hits the steel stock, it will stop moving, and the other piston will start pumping out.

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
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Re: Brake Caliper Oddity

Postby lowmanj » Sun Jan 30, 2011 8:23 pm

Thanks gentlemen,
Grease gun worked like a charm. How much pitting is generally acceptable on the chromed cylinder?
I've not cleaned it up good yet (carbs all over the work bench), but it has some rusting and less than pristine chrome surface.
Jesse

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WingAdmin
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Re: Brake Caliper Oddity

Postby WingAdmin » Mon Jan 31, 2011 11:42 am

My front calipers came out pitted, with rust, scratches and nastiness. This was one of the better ones:

Image

I cleaned them, then did gentle sanding in a circular motion, first with 600 grit, then 1500 grit sandpaper:

Image

My rear calipers were even worse:

Image

And after polishing:

Image

If it's really pitted badly, you'll have to replace them. But if you can buff them out smooth, so that the seals will seal tightly on them, you should be good.

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
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Re: Brake Caliper Oddity

Postby lowmanj » Mon Jan 31, 2011 12:35 pm

That is great news. Mine look no worse than your "before" photos. They should shape up nicely with some work then.
Thanks very much.
Jesse

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virgilmobile
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Re: Brake Caliper Oddity

Postby virgilmobile » Mon Jan 31, 2011 12:53 pm

Be sure you remove the seals and remove the aluminum oxide powder in the groove(this will also bind the piston).Also,dry fit the piston in the bore(without the seals)It should slide easy to the bottom.I had to clean my bore hole.The pistons would stick half way down.

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
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Re: Brake Caliper Oddity

Postby lowmanj » Tue Feb 01, 2011 11:39 pm

More good advice! The sand paper did wonders on your photo cylinders. Good point on cleaning the caliper end, and dry testing it too. I'll do it.
Thanks all.
Jesse




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