Rear caliper o-ring MIA! Help!

dang

dang

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So I managed to lose one of the four small o-rings that go between the two caliper halves and the rebuild kit didn't come with any. For some reason I thought it would but after opening up the box I realized I should've been more careful when taking the caliper apart.

It's #7 in the diagram although it's not listed below. Weird. Anyway, any ideas besides the typical auto parts store search? It's a flat o-ring but because of the housing design I think a round cross-section o-ring would work.

rear brake caliper diagram.jpg
 
I am sure a few will turn up for you soon...

If you get in a bind you can make one from your old square cut caliper piston seal.
Or
You can buy o-ring making kits but make sure you have the right material for brakes.
You can test the rubber by soaking it in a brake fluid for awhile.
Ymmv
Just throwing this out there for future emergencies. Cheers
Al
 
deQuincey said:
it is late now, but why did you took them a part ?
you should replace the four rings,
remember, these are EPDM, not NBR
Click to expand...

Rebuilding the calipers. The right rear was sticking but after getting it apart it doesn't look very bad. I did a light hone to clean it up and replaced seals. We'll see..
 
deQuincey said:
ok, but they say, if no leak, no dismantle,...
Click to expand...
How do you use a hone without splitting the halves? I didn't notice a leak, but with a caliper that binds you can't do much without splitting it. Anyway, doesn't look like a big deal, I ordered new half seals and it goes together fine.
 
dang said:
How do you use a hone without splitting the halves? I didn't notice a leak, but with a caliper that binds you can't do much without splitting it. Anyway, doesn't look like a big deal, I ordered new half seals and it goes together fine.
Click to expand...

plus you need to use new bolts and nuts, they are not reusable
 
deQuincey said:
why did you use a hone ?
tolerances are tight there, ....hummm i would say not recommend a hone there,...
Click to expand...
I used it lightly to clean the cylinder. To be honest, it hardly did anything. I did notice that the step on the outside of the piston is almost non-existent now. I'm wondering if that's why it's binding.

Also, why are the bolts not re-usable? Do they stretch?
 
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