Brake pistons

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Laoch
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Brake pistons

Post by Laoch » Wed Mar 14, 2018 8:08 am

How to remove brake pistons? Pull caliper, pull pads, pump or use air? Sound right? What about the seal or O rings? Are they in the piston wall? They stay in?

I'm trying get these DAMN mountain bike brakes on the Freeride to work a little better.
Bruce
2016 Freeride/'13 CB500X

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Wingfixer
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Re: Brake pistons

Post by Wingfixer » Wed Mar 14, 2018 9:06 am

Put a rag over the pistons then use shop air to (carefully) push the pistons out. If there are two pistons the one closest to the fluid inlet port will come out first, just aim the shop air at the little hole that connects the two piston reservoirs. Your bike is new enough I can't believe there would be corrosion but you can clean the pistons and bores with a little scotch-brite. The o-rings will either be on the piston or in the caliper, who knows how KTM does it but I'm sure it'll be the weirdest, most expensive way possible....Pull the o-rings, and backings (if installed(they would be white plastic looking things in the groove with the o-rings, they are not elastic)). Replace o-rings with new, fill the piston bores with brake fluid, reassemble, bleed and enjoy!
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Laoch
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Re: Brake pistons

Post by Laoch » Wed Mar 14, 2018 10:29 am

Wingfixer wrote:
Wed Mar 14, 2018 9:06 am
Put a rag over the pistons then use shop air to (carefully) push the pistons out. If there are two pistons the one closest to the fluid inlet port will come out first, just aim the shop air at the little hole that connects the two piston reservoirs. Your bike is new enough I can't believe there would be corrosion but you can clean the pistons and bores with a little scotch-brite. The o-rings will either be on the piston or in the caliper, who knows how KTM does it but I'm sure it'll be the weirdest, most expensive way possible....Pull the o-rings, and backings (if installed(they would be white plastic looking things in the groove with the o-rings, they are not elastic)). Replace o-rings with new, fill the piston bores with brake fluid, reassemble, bleed and enjoy!
:thumbup:
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Bucho
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Re: Brake pistons

Post by Bucho » Wed Mar 14, 2018 4:07 pm

From my limited research, the FreeRide has very weak brakes. They are more like for a slow speed trials bike.
Not really up to fast enduro standards.
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Laoch
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Re: Brake pistons

Post by Laoch » Wed Mar 14, 2018 4:23 pm

Bucho wrote:From my limited research, the FreeRide has very weak brakes. They are more like for a slow speed trials bike.
Not really up to fast enduro standards.
Yeah. I have found that out. They are made by a company that makes mountain bike brakes...same name.

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Re: Brake pistons

Post by Laoch » Tue Mar 20, 2018 8:29 am

Laoch wrote:
Bucho wrote:From my limited research, the FreeRide has very weak brakes. They are more like for a slow speed trials bike.
Not really up to fast enduro standards.
Yeah. I have found that out. They are made by a company that makes mountain bike brakes...same name.

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Fuckin shit. Plastic pistons. Two popped out. Two are stuck. Probably why i can't stop. Now what...ideas? Ordered ss replacement pistons. Image

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Re: Brake pistons

Post by Laoch » Tue Mar 20, 2018 9:16 am

Got those little fuckers out.
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Re: Brake pistons

Post by Nobody » Tue Mar 20, 2018 9:44 am

Laoch wrote:
Tue Mar 20, 2018 8:29 am
Fuckin shit. Plastic pistons. Two popped out. Two are stuck. Probably why i can't stop. Now what...ideas? Ordered ss replacement pistons.
Interesting, how many use plastic pistons nowadays? Seems to be not too good in a place which theoretically can become quite hot..
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Re: Brake pistons

Post by juddspaintballs » Tue Mar 20, 2018 10:07 am

If you have SS pistons coming, grab those suckers with a pair of pliers and pull them out. I have some tricks for you if that doesn't work.
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Re: Brake pistons

Post by gots_a_sol » Tue Mar 20, 2018 10:11 am

Clearly you need to use fire to remove them. Can't be stuck if they are liquid :lol2:
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