Cant get piston back in


Information and questions on GL1100 Goldwings (1980-1983)
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shevik
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Cant get piston back in

Post by shevik »



Hello there guys!

I've been rebuilding the brakes on my 82 gl1100 with quality parts from brakecrafters.com. I'm having an issue though. I took the whole thing apart, hit it with brake parts cleaner, and dremeled the inside of the seal grooves. Everything thing looks clean and good as new but I cant for the life of me get the piston back in past the new dust seal. Not with lube, not with dot4. The piston just won't go. Anyone have any experience with this?


If I just work hard enough I should be able to get her out and about before riding season is over.

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OldguyGlen
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Re: Cant get piston back in

Post by OldguyGlen »

The grooves have to be clean, and the seals well seated, but it sounds like you did that. It takes a bit of pressure, with fluid for lube. If you are just using hand pressure, you might need a bit of mechanical assistance, c-clamp, leverage. But don't overdo it. If it is really tight, something else is wrong.

Earl43P
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Re: Cant get piston back in

Post by Earl43P »

I use a deepwell socket that fits well in the piston bore.
That gives you better control of the angle of the piston to the seal and lends mechanical advantage.
I've never needed more than hand pressure.

You call it an 82 (which has dual piston calipers) but only refer to "piston" as if it were the earlier model single piston calipers.
If they are single piston, did you disassemble the caliper halves? If so, you could have the right half installed on the left caliper and vise versa, which I believe will block the pressure port, causing hydraulic lock (air lock in this case).
When all else fails, RTFM!

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dingdong
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Re: Cant get piston back in

Post by dingdong »

Do you have the seal fitted correctly? The seal inside edge is beveled not flat.

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shevik
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Re: Cant get piston back in

Post by shevik »

Earl43P wrote:
Wed Jun 10, 2020 1:45 pm
I use a deepwell socket that fits well in the piston bore.
That gives you better control of the angle of the piston to the seal and lends mechanical advantage.
I've never needed more than hand pressure.

You call it an 82 (which has dual piston calipers) but only refer to "piston" as if it were the earlier model single piston calipers.
If they are single piston, did you disassemble the caliper halves? If so, you could have the right half installed on the left caliper and vise versa, which I believe will block the pressure port, causing hydraulic lock (air lock in this case).
It's indeed both front end duel piston caliper, I cant get any of the four to go in with hand pressure :(
If I just work hard enough I should be able to get her out and about before riding season is over.

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shevik
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Re: Cant get piston back in

Post by shevik »

dingdong wrote:
Wed Jun 10, 2020 2:14 pm
Do you have the seal fitted correctly? The seal inside edge is beveled not flat.
Almost positive the seal is fitted correctly these particular seals would right themselves if I tried to flip them 'inside out'.
If I just work hard enough I should be able to get her out and about before riding season is over.

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dingdong
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Re: Cant get piston back in

Post by dingdong »

I don't mean to flip the seal. Just make sure it is facing the right direction front to back. The inside circumference of the seal is beveled. This allows the piston to be installed easily.

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newday777
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Re: Cant get piston back in

Post by newday777 »

shevik wrote:
Wed Jun 10, 2020 4:51 pm
dingdong wrote:
Wed Jun 10, 2020 2:14 pm
Do you have the seal fitted correctly? The seal inside edge is beveled not flat.
Almost positive the seal is fitted correctly these particular seals would right themselves if I tried to flip them 'inside out'.
My question is did you get the correct kit??
I've never dealt with brakecrafters. Only K&L kits.
The next thing... Is this the caliper? Which one?
1982 was the 1st year of the 2 piston calipers.
1983 had some variation in piston size so there are different kits for the gl1100 brake calipers. 1980/81 are different than 82/83. 82 and 83 had model changes in calipers too so you need to pay close attention to the kits you get are for your specific year and model 1100. Aspencade uses different calipers than the Interstate and naked GL.

pocketchange
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Re: Cant get piston back in

Post by pocketchange »

Time to pull out the micrometer.. pc.

topgun
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Re: Cant get piston back in

Post by topgun »

Do the pistons fit without any seals in caliper?

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WingAdmin
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Re: Cant get piston back in

Post by WingAdmin »

Usually this means that there is crystallized brake fluid residue in the grooves, not allowing the seals to fully seat.

Also, I assume you've coated everything (seals AND piston) liberally with brake fluid as a lubricant before trying to insert the piston?

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rooferx
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Re: Cant get piston back in

Post by rooferx »

Had same issue on a 85 ordered all balls kit went rite in... nothing is perfect.

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thebruce
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Re: Cant get piston back in

Post by thebruce »

Been a looong time since I rebuilt a caliper.

If you are positive everything is clean clean clean, try tucking the quad seal into the caliper body with a small screwdriver or back side of a curved pick while holding light pressure on the piston. You should be able to put the piston in without a bunch of mechanical advantage.

I have found that the hard edge of the seal will catch on the hard edge of the bore, but if you can tuck the edge of the seal past, it will slip right in. Mmm. Yeah.

If there is any slop in the seal around the piston, you probably don't have the right seals for that caliper.


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