07-21-2021, 04:24 PM
You guys are exactly right, it's the water in the fluid that causes internal corrosion, it gets worse when the bike is not operated for some time and the corrosion can get a hold on some parts, the fluid will still operate as normal though.
Did not know this myself until i took a good look at my cb550 front bake system,i was just in time but it took a long time and many searches on the internet before i realized the tiny hole in the master cylinder had to be carefully opened up to let the air out of the system, allow for expansion of the brake fluid when it gets warm so the brake does not bind up and pressure was restored.
And talk about corrosion; the back of the master cylinders ( where the handle engages the piston under the little rubber boot ) is vulnerable to small fluid leaks which again can corrode mostly the alu parts of the units, i use some persistent lube like grease or heavy gear oil to avert this from happening.
A test showed that an open cup of brake fluid goes bad in one hour, i tested this with a water content tester and was surprised it took such a short time to go bad ( from 0% to more than 3% moisture in 1 hour when left to atmosphere ) i made a video about this test and can post a link if anybody is interested.
Did not know this myself until i took a good look at my cb550 front bake system,i was just in time but it took a long time and many searches on the internet before i realized the tiny hole in the master cylinder had to be carefully opened up to let the air out of the system, allow for expansion of the brake fluid when it gets warm so the brake does not bind up and pressure was restored.
And talk about corrosion; the back of the master cylinders ( where the handle engages the piston under the little rubber boot ) is vulnerable to small fluid leaks which again can corrode mostly the alu parts of the units, i use some persistent lube like grease or heavy gear oil to avert this from happening.
A test showed that an open cup of brake fluid goes bad in one hour, i tested this with a water content tester and was surprised it took such a short time to go bad ( from 0% to more than 3% moisture in 1 hour when left to atmosphere ) i made a video about this test and can post a link if anybody is interested.