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I'm new to the Polaris scene so not a lot of experience with them. None with a caliper that is operated by 2 different systems like the rear brake caliper on the 2005 sportsman 500.

My buddy's quad has a loss of brake fluid in the main system, but we can't locate a leak in it. The rear master cylinder does leak at the foot paddle area.

Are this systems connected in the caliper? Will a leak in the rear system affect the fluid in the main system?

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Yes and no

Yes - the systems are connected inside the rear caliper

No - a loss of fluid from the foot master cylinder will not cause a loss of fluid from the hand system unless there is an internal leak inside the caliper and that would cause a loss of braking unless both systems are being utilized at the same time.
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