85 1200 Aspy Rear Brake - Steve Saunders Goldwing Forums

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post #1 of 29 (permalink) Old 08-26-2017, 05:29 PM Thread Starter
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85 1200 Aspy Rear Brake

About 60 miles into a planned 180 mile trip yesterday, the bike seemed to be losing power suddenly. I was able to get to a gas station, where I felt the rear and right front brake discs. They were hot. And the brake pedal got completely soft.

This morning I verified that the rear brakes had seized -- not completely -- and that the right front was rubbing the disc more than usual. I'm really afraid this means that the return orifice in the master cylinder may be plugged and that it should be serviced. (Not looking forward to that.) Part of the plan is to clean up all the calipers and pistons; the picture shows how far I got with the rear. That single brake pad is jammed in there pretty tight, especially on the left side. Should have used a shim, I guess. Anyone have any ideas how to proceed from here? All suggestions will be welcome. Thanks.
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post #2 of 29 (permalink) Old 08-26-2017, 05:44 PM
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You are going to have to press the pistons back in enough to get the pad out then force the pistons out, they are almost there.

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post #3 of 29 (permalink) Old 08-27-2017, 12:19 AM
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Use a couple bar clamps to push against the back of the pad.

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post #4 of 29 (permalink) Old 08-27-2017, 12:53 AM
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I was going to suggest a C clamp or similar- but dared not risk mocking, since Dennis says so...

Had to use the HFT squeeze clamp on a dual piston cage caliper this morning.
Pads well below minimum and pistons extended maximum, with dual pistons just to make it more entertaining.
If you push one piston in alone or ahead of the other- the other moves OUT
Trick is keeping a centered force across both piston by using an old brake pad as a spreader- then 2 thin C clamps slipped in the small slots of caliper body should fix you up

Open the bleeder valve, cover with rag as you push the pistons in. Based on my experience today, things can get messy.

Live and Learn: Its 100+ hot here, if you dont move the compressor into the shade the pressure inside tank drops substantially!
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post #5 of 29 (permalink) Old 08-27-2017, 10:54 AM Thread Starter
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Quote:
Originally Posted by DaveO430 View Post
You are going to have to press the pistons back in enough to get the pad out then force the pistons out, they are almost there.

Gents, thank you all. I'll do as you suggest. One question: Once the brake pad is out, should I put the caliper back on the brake system to force the pistons out? Just want to make sure there's not an easier way. Thanks.

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post #6 of 29 (permalink) Old 08-27-2017, 11:06 AM
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Once it's out that far it shouldn't be too hard to pull the rest of the way out.

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post #7 of 29 (permalink) Old 08-27-2017, 01:33 PM
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If you chose to use hydraulic pressure to push the piston out, one will move and the other not. Put a c clamp on each piston and let the move one at a time.

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post #8 of 29 (permalink) Old 08-27-2017, 01:45 PM Thread Starter
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Quote:
Originally Posted by Bike...and Dennis View Post
Once it's out that far it shouldn't be too hard to pull the rest of the way out.
You're right, Dennis. I was able to get the brake pad out with just one C-clamp - all I have -- by tightening very slightly one piston and then the other. Then I grabbed the very end of the pistons using channel locks and then both came out relatively easily.

I've since removed the seals, cleaned out the channels carefully with a pick, washed both the pistons and the caliper body in soap and water, and shined up the pistons with 500, 600, 800 and 1000 grade sand paper.

Next step is to get the new seals and brake pads here. Thanks to you and everyone for your advice.

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post #9 of 29 (permalink) Old 08-27-2017, 06:24 PM
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get some 1500-2000 for final finish on the pistons and caliper bores.

Having a small compressor, or at least a 10 gallon portable (lug to gas station to fill) air tank on hand, really helps on
projects like removing stuck pistons with air thru the bleeder
Caution! the pistons can come out with finger smashing force! A block of wood slipped in caliper will stop them safely.

Someone on here used air pressure to clear a rear brake line recently.
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post #10 of 29 (permalink) Old 08-27-2017, 06:44 PM
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In your first picture the pistons look to far gone to salvage.

Could you post a picture of them after the cleanup?

Advise given here is free and comes with no warranty "Caveat emptor"

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