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General Category => Modifications => Topic started by: wildfire on November 13, 2014, 01:52:52 PM

Title: Rear Caliper Replacement
Post by: wildfire on November 13, 2014, 01:52:52 PM
Well I just discovered that one of my rear brake caliper pistons is rusted in place and will not move outwards. I had this problem on a different bike and was able to use compressed air to free it but I dont have access to compressed air anymore.

My FJ is a 92 . I am thinking of just replacing the caliper with a used one from Ebay.  Does anyone know what other years will fit or if you have one for sale for a 92 that is in good condition and pistons move freely let me know.

Thanks
Title: Re: Rear Caliper Replacement
Post by: aviationfred on November 13, 2014, 02:11:15 PM
I have a spare rear brake caliper that came off of my 89' that I don't need.


Also, the rear calipers are the same for the entire production run of the FJ1100/1200

http://www.partzilla.com/parts/detail/yamaha/YP-31A-W0057-00-00.html (http://www.partzilla.com/parts/detail/yamaha/YP-31A-W0057-00-00.html)


Fred
Title: Re: Rear Caliper Replacement
Post by: wildfire on November 13, 2014, 03:24:25 PM
I noticed online that some rear calipers have 1 bleed valve and others have 2. Mine has two
Title: Re: Rear Caliper Replacement
Post by: MOTOMYSZOR on November 13, 2014, 03:28:06 PM
Just connect calliper to brake hose,  block good one piston with anything (for me was enough my hand) and ask someone to pressing down brake pedal until piston will pop out .
In mine calliper was enough to clean everything out and put some red grease to fix problem.
Title: Re: Rear Caliper Replacement
Post by: wildfire on November 13, 2014, 03:40:54 PM
Quote from: MOTOMYSZOR on November 13, 2014, 03:28:06 PM
Just connect calliper to brake hose,  block good one piston with anything (for me was enough my hand) and ask someone to pressing down brake pedal until piston will pop out .
In mine calliper was enough to clean everything out and put some red grease to fix problem.

Already tried that. Wouldnt budge.
Title: Re: Rear Caliper Replacement
Post by: scotiafj on November 13, 2014, 05:10:20 PM
Quote from: wildfire on November 13, 2014, 01:52:52 PM
Well I just discovered that one of my rear brake caliper pistons is rusted in place and will not move outwards. I had this problem on a different bike and was able to use compressed air to free it but I dont have access to compressed air anymore.

My FJ is a 92 . I am thinking of just replacing the caliper with a used one from Ebay.  Does anyone know what other years will fit or if you have one for sale for a 92 that is in good condition and pistons move freely let me know.

Thanks

try a car brake piston rewind tool ... looks a bit like a G clamp but has longer jaws that you put into the caliper between the pads and just wind the pistons back into the caliper ...then you can remove it and pump the rear brake pedal and see if the pistons move back out ...
Title: Re: Rear Caliper Replacement
Post by: movenon on November 13, 2014, 05:53:37 PM
Tom I also have a rear caliper off a 1990 that you are welcome to if you can't get the piston out.  You could remove the caliper and take it up to any shop that has compressed air and have then or you blow it out.
George
Title: Re: Rear Caliper Replacement
Post by: wildfire on November 13, 2014, 06:31:21 PM
Quote from: movenon on November 13, 2014, 05:53:37 PM
Tom I also have a rear caliper off a 1990 that you are welcome to if you can't get the piston out.  You could remove the caliper and take it up to any shop that has compressed air and have then or you blow it out.
George

Thanks for the offer. I will try a shop tomorrow and hope the piston is not badly rusted or pitted.
Title: Re: Rear Caliper Replacement
Post by: racerrad8 on November 13, 2014, 07:01:41 PM
Quote from: wildfire on November 13, 2014, 06:31:21 PM
Thanks for the offer. I will try a shop tomorrow and hope the piston is not badly rusted or pitted.

Replacement pistons as well as the rebuild kit are available.

Brake Caliper Piston #1 (http://www.rpmracingca.com/proddetail.asp?prod=M%2FC%3ACaliperpiston1)
Brake Caliper Kit #1 (http://www.rpmracingca.com/proddetail.asp?prod=M%2FC%3ACaliperKit1)

Randy - RPM
Title: Re: Rear Caliper Replacement
Post by: aviationfred on November 13, 2014, 08:32:26 PM
Here is the rear caliper that I have. It worked with no issues when I removed it from my 89'.


(http://i119.photobucket.com/albums/o145/aviationfred/temporary_zps4da0ebb4.jpg) (http://s119.photobucket.com/user/aviationfred/media/temporary_zps4da0ebb4.jpg.html)

(http://i119.photobucket.com/albums/o145/aviationfred/temporary_zps770ce071.jpg) (http://s119.photobucket.com/user/aviationfred/media/temporary_zps770ce071.jpg.html)

(http://i119.photobucket.com/albums/o145/aviationfred/temporary_zpse1ebc9d2.jpg) (http://s119.photobucket.com/user/aviationfred/media/temporary_zpse1ebc9d2.jpg.html)

If you want it. $15.00 should cover shipping.

Fred
Title: Re: Rear Caliper Replacement
Post by: Earl Svorks on November 16, 2014, 12:36:02 PM
  Did you ever wonder why bleed screws are shaped very much like grease fittings ?
Use your imagination, and your grease gun.
Title: Re: Rear Caliper Replacement
Post by: FJ1100mjk on November 16, 2014, 12:53:26 PM
Quote from: Earl Svorks on November 16, 2014, 12:36:02 PM
  Did you ever wonder why bleed screws are shaped very much like grease fittings ?
Use your imagination, and your grease gun.

Cryptic. Me likey.
Title: Re: Rear Caliper Replacement
Post by: wildfire on November 16, 2014, 01:01:33 PM
Quote from: Earl Svorks on November 16, 2014, 12:36:02 PM
  Did you ever wonder why bleed screws are shaped very much like grease fittings ?
Use your imagination, and your grease gun.

That might have worked assuming I had a grease gun but I doubt it would  as it was seized . But 65psi and $5 as a thank you took it out. Will need to replace it as the pitting was so bad.