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SM rear caliper piston installed backwards?

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My friend got a new to him sm this week and we were giving it the once over. I observed as He put new pads all around and I swear as he installed the rear pads the pistons flat face was facing the pads. I didn't say anything but is that piston in backwards? He has not ridden it yet because it is raining pretty bad but do I need to plant this seed of doubt in his head?

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I have never seen a SM rear caliper piston so I can not answer your question directly.  However, some motorcycle caliper pistons have a cap on the open end so it may look like a closed end contacting the back of the pad.  If you are concerned, it is easy to take another look at it.  With the pads removed, pump the piston out about 1/2 way and you can tell if it is a cap or the closed end.

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Thanks noble, imagine I the piston is a cup you would drink out of. The flat part that would sit on the table is what was coming out of the caliper. Its been awhile since I looked at mine but I think on mine the hollow or open end was pointing towards my pads. I guess either way could work its just that the way his is would take alot more fluid to fill up the caliper bore. I jut wanted to get a second opinion before I make him go through the trouble of flipping it around.

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Flat side into the caliper. Wonder why he would have pulled it all the way out of the caliper???

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Hummm...looks like there is a cup on the inside of the piston according to the diagram. I may have to go out and pull my rear caliper to be sure of what I am talking about. So until I or someone who has actually taken the darn thing apart chimes back in this may be a sticking point. To bad it doesn't show direction or a reverse view of said piston.

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What does the other side of that piston look like Eric? Line drawings can be decieving sometimes. Also the drawing was for a front caliper. Thank you for the pic. I have not fully disassembled a DR-Z caliper yet. But I have worked on others and it has always been the flatter side into the caliper hence my comments. My comment was an educated guess not out right guess...

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What does the other side of that piston look like Eric? Line drawings can be decieving sometimes. Also the drawing was for a front caliper. Thank you for the pic. I have not fully disassembled a DR-Z caliper yet. But I have worked on others and it has always been the flatter side into the caliper hence my comments. My comment was an educated guess not out right guess...

The drawing I posted is a rear caliper..

 And the other-side of the piston is solid, ie closed.

 

Jim,,,, my "guess" comment was not pointed at you or anyone else... but inward to my response.. as in.. I was not guessing. 

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Eric I mean the first drawing posted. Sorry. The first drawing is a two piston. The second with your pic is a single piston. And about the guess comment I was kinda guessing and did not take offense. Because you know what you are talking about. I was not certain and made and educated guess based on other previous work with brakes. Your cool but thanks for the clarifacation! :)

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