Brake Caliper rebuild - Chicagoland Sportbikes
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post #1 of 14 (permalink) Old 04-07-2008, 05:03 PM Thread Starter
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Brake Caliper rebuild

My CB550 is getting a front brake rebuild this week (whenever the friggin' parts get here), I am curious though if I can media blast the caliper and piston to clear off some surface rust or if doing so will screw up the seal that the piston makes with the caliper housing. I have some very fine grit glass beads I was planning on using but don't want to fuck my caliper up. The brakes work now but aren't quite as strong as they could be, let me know your thoughts.

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post #2 of 14 (permalink) Old 04-07-2008, 05:16 PM
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NO!! if the pistons are rusty they are junk. you can do the caliper itself just get all the glass out with a blow gun.
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post #3 of 14 (permalink) Old 04-07-2008, 05:35 PM
 
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the only part you want to sandblast is the top part of the piston. The one that makes contact with the pad.
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post #4 of 14 (permalink) Old 04-07-2008, 06:13 PM Thread Starter
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I think you guys missed what I'm asking.

There is some pitting on the side of the piston, it's very light though. I'm asking if media blasting the piston will result in a piston that is incapable of sealing with the caliper this resulting in a lack of hydraulic pressure... i.e. a leaky caliper. Or would a light media blasting remove the rust and not damage the piston/caliper?

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post #5 of 14 (permalink) Old 04-07-2008, 06:20 PM
 
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I would take emery cloth or a very high grit sand paper remove the rust.

The groove on the piston has an o ring which seals the piston in the caliper. So that seal can be worn out.
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post #6 of 14 (permalink) Old 04-07-2008, 06:23 PM Thread Starter
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Quote:
Originally Posted by mmmclsb View Post
I would take emery cloth or a very high grit sand paper remove the rust.

The groove on the piston has an o ring which seals the piston in the caliper. So that seal can be worn out.
No groove on the piston, there is a seal on the caliper though, the caliper is rust free though, it's only the outside of the caliper and the piston that could use a once over.

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post #7 of 14 (permalink) Old 04-07-2008, 06:28 PM
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It sounds like you should be able to safely do what you're considering, but it's a judgement call. To help us see to what degree the corrosion is and exactly where, a good close up pic will help us to better answer you.
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post #8 of 14 (permalink) Old 04-07-2008, 06:29 PM Thread Starter
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Originally Posted by Sandman View Post
It sounds like you should be able to safely do what you're considering, but it's a judgement call. To help us see to what degree the corrosion is and exactly where, a good close up pic will help us to better answer you.
Good call, give me a min.

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post #9 of 14 (permalink) Old 04-07-2008, 06:38 PM Thread Starter
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post #10 of 14 (permalink) Old 04-07-2008, 08:56 PM

 
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I'd see if you can get new pistons. They're like forks and fork seals. Any imperfection that sticks out will slowly tear up the seal. Any spot that is dented and lowered will allow fluid to pass by. I don't like to guess with brakes.

Be sure you replace all the seals when you rebuild the calipers. Also be absolutely sure about which part of the seal goes inward and which goes outward. There is a slight lip on the seals that help the caliper retract when brake pressure is released. I don't know if older bikes seals were designed this way, but triple check it.

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post #11 of 14 (permalink) Old 04-07-2008, 09:09 PM
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hm,

they look fine to me, just take some cloth and brakleen and it should come right off.


I dont see any metallic deformities just normal crap and crud.


And def get new seals, they look BAD to me.

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post #12 of 14 (permalink) Old 04-07-2008, 09:12 PM
 
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put the pistons in the oven at 450 for 30 min if the black stuff dose not sand off trash them.they will leak if not smooth.
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post #13 of 14 (permalink) Old 04-07-2008, 09:30 PM
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+1 on the emry cloth and make sure you get new seals. Use new brakefluid on the emry cloth to provide lubrication and make sure you use new brake fluid to rinse all parts before reassembly.
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post #14 of 14 (permalink) Old 04-07-2008, 10:39 PM Thread Starter
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Rock and roll, thanks for the input all, much obliged.

Brian
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