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  #1  
Old 01-12-2019, 04:15 PM
lewy lewy is offline
 
Join Date: Nov 2009
Location: Jackson Ohio
Posts: 138
Default Matco Brake MHE51B

Hello, has anyone replaced the o-ring in the brake assembly? Mine has developed a drip and need to disassemble, how do you get the puck out of the assembly?
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  #2  
Old 01-12-2019, 04:50 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 808
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The classic way to remove the piston is to carefully blow air (or fluid) into the brake line fitting on the caliper assembly. Be careful that you don't over-pressurize the piston thus turning it into a projectile!
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  #3  
Old 01-12-2019, 05:02 PM
rongawer rongawer is offline
 
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 440
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An easy way to remove the puck is to pressurize the fluid side. I remove the caliper, place the piston face-down on a firm surface and then use low pressure air into the fluid fitting. Generally a quick puff of 10-15# air does the job.
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  #4  
Old 01-13-2019, 05:31 PM
lewy lewy is offline
 
Join Date: Nov 2009
Location: Jackson Ohio
Posts: 138
Default No leak

Thanks for the info, local mechanic had the correct o-rings and we rebuilt both sides. Had a little grit causing the drip. Thanks again.
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  #5  
Old 01-14-2019, 10:08 AM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 141
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Quote:
Originally Posted by lewy View Post
Thanks for the info, local mechanic had the correct o-rings and we rebuilt both sides. Had a little grit causing the drip. Thanks again.
You could have Flex Honed the cylinders of the calipers, while the calipers were open, to assure a good, smooth unbuggered sealing surface for the new seals. Always a good idea if an O ring has already been wrecked by a bore with grit in a caliper.
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