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ATV Brakes & Suspension Have a question about your brakes? Need some suspension advice? Try this section for answers

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Old 03-29-2010, 05:18 PM
kling2001's Avatar
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rear master cylinder bleeding question

I'm replacing the rear master cylinder on a 2004 sportsman 500 h.o. atp.
The plunger stays in the cylinder, and the foot pedal flops up and down, so i figured that the plunger is corroded. I can pull it back out with pliers.
but wont come back out on its own.

My question is how should i go about bleeding the new master cylinder? Should i put it on the bike and use some plastic fittings and little hoses and feed the hose ends into the reservoir like bleeding a car master cylinder. and pump it to get the air bubbles out then quikly screw the lines on ?
Then bleed the calipers to get all the air out of the lines.

(This has the dual rear calipers because its the atp)

Thanks for any advice in advance.
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Old 03-30-2010, 02:03 PM
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yes ,you can bench bleed those with the resevoir on but, you still should bleed the rear pistons just to be sure to get all the air and dirt out.
keep a paper clip or a tiny drill bit handy to clean out the passages in the bleeder screws.
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Old 03-30-2010, 07:26 PM
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yeah i figured its pretty much straight forward, i just didnt wanna miss anything, or if anybody knew a easy way,

thanks for the response
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Old 05-19-2010, 02:57 PM
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ok, i figured out that you need to keep fluid in the handle bar reservoir, and in the rear reservoir, its a split system
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Old 05-20-2010, 12:40 AM
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You can do that procedure. just make sure to flush all the fluids before using a new and fresh one to avoid contamination.
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Old 05-23-2010, 03:22 PM
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Cover the bars and plastic to avoid spilling the fluid on your machine. The fluid will jack the paint ig it spills over wen the master is filled. It shouls bleed like a caliper on a car.
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