Rear brakes won't bleed - Yamaha Grizzly ATV Forum
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post #1 of 5 Old 07-31-2010, 09:51 PM Thread Starter
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Rear brakes won't bleed

Ok. I lost my cap for my rear master cylinder. After taking my rear cylinder all apart, plunger and all, because of all of the mud and sand that had accumulated inside, I put everything back together. Without hooking up the brake lines, I filled the resevoir, tried pumping the brakes but not a thing comes out of the master cylinder. I was checking that the MC works before I attach any of the brake lines just to make sure that it was working alright but nothing. I don't see why the master cylinder would be bad. There is nothing in there but a plunger and a spring and they are all working good. Again, this just happened after losing the cap, that's all. Anyone ever had this happen to them or have a word of advice?
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post #2 of 5 Old 07-31-2010, 11:06 PM
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ok, this is from my experience. This is going to take you some time to get the air out of the system. What I did was to slowly grab the brake handle to the grip. Hold it there for a couple seconds. You will see bubbles in the fluid reservoir as you do it. Do this procedure slowly and continue till you finally get your brake handle back. Then bleed each side of the rear brake caliper.

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post #3 of 5 Old 08-01-2010, 08:52 AM
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hook the lines up to the calipers. and then start the bleeding process like he said.
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post #4 of 5 Old 08-02-2010, 04:09 PM Thread Starter
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I'll give it a whirl. I'll let you know what I find out.
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post #5 of 5 Old 08-03-2010, 10:05 AM
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One of the easy ways to bleed your brakes is to back bleed them. with the reservoir empty put a squirt can with a rubber hose on the end over the rear brake bleeder and open the bleeders on both sides. Start squirting brake fluid into the system until brake fluid starts running out the other bleeder and then close it. continue to pump brake fluid in and start filling the resevoir. when you have it full you should not have any air in the system. I use this method all the time and it works. If you still have brake problems then you need to look closer at the MC.

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