Rusty. Rear caliper piston....... Damn


Information and questions on GL1000 Goldwings (1975-1979)
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W109driver
Posts: 89
Joined: Tue Sep 08, 2020 10:11 am
Location: Devon. England
Motorcycle: 1976 GL1000

Rusty. Rear caliper piston....... Damn

Post by W109driver »



Finally worked out how to remove my rear caliper.
Hard without a centre stand.


Jammed up and rusty. So annoying


Need new piston, and seals. Do they come with dust covers?


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dingdong
Posts: 4025
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Rusty. Rear caliper piston....... Damn

Post by dingdong »

The outside edge of the piston is never likely to meet the seal. Pull the piston and check the inside surface of the piston. If it is not pitted you won't need new pistons. Polish the piston and ride it.

Edit. Seals yes, pistons ???
W109driver
Posts: 89
Joined: Tue Sep 08, 2020 10:11 am
Location: Devon. England
Motorcycle: 1976 GL1000

Re: Rusty. Rear caliper piston....... Damn

Post by W109driver »

Love a positive attitude.
Will do. Gonna check/polish it tomorrow.
👍
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WingAdmin
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Re: Rusty. Rear caliper piston....... Damn

Post by WingAdmin »

When I had my 82 Aspencade, replacement pistons were simply unavailable. Mine were pretty badly pitted. I took them out, wire brushed them to clean all the rust and crud off and clean out the pits, then used a thin coat of J-B weld to fill in the pits. Once that had cured, I used successive grits of wet sandpaper (up to 1500) to first remove the J-B Weld coating down to the chrome (leaving it in the pits) and then polish it smooth. Reinstalled and it worked fine like that for many years.
W109driver
Posts: 89
Joined: Tue Sep 08, 2020 10:11 am
Location: Devon. England
Motorcycle: 1976 GL1000

Re: Rusty. Rear caliper piston....... Damn

Post by W109driver »

Fixed.
Tried a 38mm seal from a old Volvo rebuild kit. Unknown to me Old piston just pinched seal on way in.
Put all back together.
Fluid poured out.
Stripped down again.
Ordered new remanufactured piston and original seal.
Seal felt much more pliable than Volvo seal.
All back together. Working perfectly.
Learning so much.
Happy days!

Thanks for your help guys.


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