Need a rear caliper piston (or caliper)

[Beav068]

Hello there everyone. My name is Tim, and I'm an old bikeaholic.

It has been less than a day since my last ride.

Okay, joking aside. I just purchased a 1980 XS1100G, and am in the process of getting it road-ready.

The first issue I have is the rear brake. When I purchases it, the rear line was pulled out of the banjo, and I knew that was bad news. However, I pulled the caliper today to look, and saw that the piston is completely rusted in there, and the top of the piston is broken.

So....that's where I'm at. Anyone have a piston or complete rear caliper that they can impart to a pretty cash-challenged owner of old bikes?

And if you are wondering, my other bike is a completely stock 1972 CB750K2 with just under 20,000 miles.

Hey, like I told my wife....at least I bought a new(er) bike. :-)

Tim

[John]

There is a member in your neck of the woods named andreashweiss, and he sells a lot of parts for these bikes. Look up his username, or look for his ad in the Buy, Sell, trade forum. He will probably have one.

[trbig]

You can get the pistons from Partsnmore.com. Minimum order of $35 though.

But yeah, Adreas is the best choice around here for used parts besides Ebay.


Tod

[Beav068]

Well, I found out that the broken part was somewhere between my ears. I was so irritated with the PO that I failed to notice the "broken" piece of piston was actually some foreign piece of metal lodged in the open end of the piston.

At least I THINK the piston comes out of the caliper open end first? I can see the closed end of the piston in the caliper still, so I think I just need to somehow work that thing out, clean it all up and see if it is (by some miracle) still usable.

Am I missing anything here?

Tim

[DiverRay]

Use the master cyl. and brake fluid to "pump" the piston out. Once you have it out, you can clean everything up. The piston just needs to be smooth, as the seal on the inside end does all the "work" of keeping the fluid. The inside bore of the caliper MUST be VERY SMOOTH, as it is the other side of the seal.
Look at the "tech tips" from the home page, and you will find the directions for cleaning and rebuilding the caliper and master cyl.

[AlanB]

Hi Tim,

Piston IS open end out.

The section of piston you see can be as ugly and rusty as it likes;... Only the section which slides through the seal needs to be good.

To get the piston out, refit the line, bleed the brake, and use the master cylinder to pump it right out. be careful with the spilled fluid, it is a GREAT paintstripper......

Blowing the piston out with high-pressure air converts your brake into a fairly efficient gun; don't do it!

AlanB

[HobbyMan]

Check around on ebay. Sometimes you find SS pistons. I havn't seen any recently though

[Beav068]

As I said, I'm new to caliper work. Once I have the caliper removed, pads off, all I should have is:

Boot retaining clip
Boot
Piston
Piston seal (inside caliper)
Caliper body
pad screw
bleeder

Am I missing anything? I want to make sure all the parts are there before I try to resurrect this thing.

Tim

[Yahman]

Hello Tim, I see your in Salem also, I have a rear caliper that you can have if you need one. PM me and we'll see when we can get together.

Larry

[Beav068]

Well, I am pretty sure I am going to need that caliper, as I haven't been able to get that piston to move AT ALL either by wrapping it and using channel locks, or by using compressed air.

I am going to try to use the brake system, but I have to get it all put together to do it. When I bought the bike, the rear brake line was pulled out of the banjo, the MC was empty, and one of the rear pads was missing (probably removed by the idiot PO due to the frozen caliper) so I don't have much hope for the caliper after it being open to the environment for only God knows how long.

Thanks for your help gents. Keep it coming!!

Tim

[Beav068]

Just so you can see what I am working with, here is a picture.



I hope this works, as I haven't posted pics in a while.

The wet look is due to the penetrating oil I applied to try to loosen things up.

Anyone have experience is resurrecting one this bad?

Tim

[jetmechmarty]

New caliper

http://www.mikesxs.net/mikesxs-chass...ategory_id=1.2

The XS650 caliper is the same as the rear caliper on the XS1100. There is a new one at the link above.

[Beav068]

Well there you go...first pic post in a while and I managed to screw it up. This one will hopefully work.



Thanks for the info on the 650 caliper. I'll check it out.

Tim

[John]

You might want to read this

If you want to remove the piston, try this. Look for the post from me.http://www.xs11.com/forum/showthread...caliper+piston

[XSPastor]

Yuck!

Wow! That caliper looks REALLY bad! I'd spend the c note and get a new one from Mike'sXS or look for one on ebay. Seriously, be careful if you are trying to force it out with compressed air. You could seriously injure yourself when (if?) that thing lets loose!