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ATV Brakes Locking Up
#6421300
08/23/16 08:44 PM
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Joined: Feb 2011
Posts: 3,019
Bar-D
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I have a Yamaha 350 Bruin 2WD atv. The front brake calipers are not releasing and will lock up by their selves sometimes when just sitting, not running. The only way to get them to release is loosening the brake line at the reservoir and bleeding a little pressure. They immediately release but will soon lock up again. I have flushed and changed the brake fluid, disassembled and cleaned the calipers and installed new o rings on the pistons. I worked for two days to make sure all the air was bled out of the system. After all that they worked OK for about a week and it started all over again. Anyone have any ideas?
Last edited by bar-d; 08/23/16 08:45 PM.
People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf
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Re: ATV Brakes Locking Up
[Re: Bar-D]
#6421510
08/24/16 12:05 AM
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Joined: Oct 2007
Posts: 19,246
TEXASLEFTY
THF Whiskey Sommelier
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The brake hoses from the chassis/frame to the caliper/wheel cylinder is your problem most likely...
Never been to a camping world. I prefer Dick's to be honest.
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Re: ATV Brakes Locking Up
[Re: Bar-D]
#6421549
08/24/16 12:35 AM
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Joined: Apr 2011
Posts: 856
shumpertdavid
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By your description, it sounds like there's an issue in the master cylinder. If you can crack a line at the reservoir (I assume it's mated to the master cylinder) and everything releases, then something in the master cylinder isn't releasing or holding pressure when it shouldn't. You can try disassembling it, cleaning everything with clean brake fluid, clearing the small orifices, etc, but most likely it'll need a rebuild kit at minimum.
Hope this is helpful.
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Re: ATV Brakes Locking Up
[Re: shumpertdavid]
#6421878
08/24/16 05:00 AM
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Joined: Feb 2011
Posts: 3,019
Bar-D
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The brake hoses from the chassis/frame to the caliper/wheel cylinder is your problem most likely... Don't understand what problem you are talking about. The hoses are not kinked or cracked and do not leak. They were flushed out when I did the calipers. Am I missing something? By your description, it sounds like there's an issue in the master cylinder. If you can crack a line at the reservoir (I assume it's mated to the master cylinder) and everything releases, then something in the master cylinder isn't releasing or holding pressure when it shouldn't. You can try disassembling it, cleaning everything with clean brake fluid, clearing the small orifices, etc, but most likely it'll need a rebuild kit at minimum.
Hope this is helpful. Forgot to mention in the original post I installed a rebuild kit in the master cylinder as well when I did the calipers. Looked like it was going to be the answer but went back to the same thing after about a week. By the way, when they started locking up, I hadn't started or ridden the atv. It had just sat in the shop and every day I would go by and rock the atv back and forth to make sure it was still rolling. After about the 7th or 8th day, they had locked up again.
People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf
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Re: ATV Brakes Locking Up
[Re: Bar-D]
#6421970
08/24/16 11:52 AM
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Joined: Oct 2007
Posts: 19,246
TEXASLEFTY
THF Whiskey Sommelier
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THF Whiskey Sommelier
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The rubber hoses collapse internally over time (sometimes) and will only let the brake fluid pressurize not release...
Never been to a camping world. I prefer Dick's to be honest.
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Re: ATV Brakes Locking Up
[Re: Bar-D]
#6422067
08/24/16 01:25 PM
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Joined: Jul 2012
Posts: 15,701
603Country
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I had a similar problem. I found that my ATV brakes were on partially all the time. You could drive it, but you couldn't push it. I was on the verge of taking the whole brake system apart when I found that the foot brake (mechanical, rather than hydraulic) had rusted in the down position. Much penetrating oil and working the brake arm up and down, and it was Ok.
Not my monkeys, not my circus...
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Re: ATV Brakes Locking Up
[Re: 603Country]
#6423506
08/25/16 04:01 AM
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Joined: Feb 2011
Posts: 3,019
Bar-D
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I had a similar problem. I found that my ATV brakes were on partially all the time. You could drive it, but you couldn't push it. I was on the verge of taking the whole brake system apart when I found that the foot brake (mechanical, rather than hydraulic) had rusted in the down position. Much penetrating oil and working the brake arm up and down, and it was Ok. Haven't checked the inside of the brake hoses. Haven't thought about the foot brake either. Thanks for the suggestions guys.
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