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Title: Brake Fluid. Moisture Content. Change Intervals. Post by: koko64 on February 20, 2024, 12:07:07 AM Changed the brake and clutch fluid on a 749S six months ago. Used a reputable local brand of DOT4 (Penrite). Flushed and bled carefully using a number of methods but an electronic fluid tester recently indicated that the fluid had too high a moisture content (fail). Did it all again with Castrol DOT4. I actually tested the new bottle after opening and although passing, the device indicated a low level of moisture content.
Although the bottles have an inner seal under the cap there must be a negligible amount of moisture in the air gap between fluid and cap. The device i purchased is new and used in many workshops. It's a pretty sensitive device! A rule of thumb for street bikes is to change brake fluid change every 2-3 years. Areas with high humidity may be every two years. Any comments or insights much appreciated. For reference. https://www.misco.com/when-to-change-your-brake-fluid/ Title: Re: Brake Fluid. Moisture Content. Change Intervals. Post by: Howie on February 20, 2024, 05:08:51 AM Shocking!
I've always change fluid on bikes yearly and cars every two years and use an extra high boiling point DOT 4 like ATE 200. Title: Re: Brake Fluid. Moisture Content. Change Intervals. Post by: DarkMonster620 on February 20, 2024, 07:24:31 AM I always changed my brake/clutch fluid on the bike every 18 months, yes, that much humidity and in my car
Title: Re: Brake Fluid. Moisture Content. Change Intervals. Post by: stopintime on February 20, 2024, 01:36:24 PM The very best Castrol (boiling point 70 degrees higher than number two) three years ~ 40,000km. Neither bottle or bike reservoir any sign of humidity. Cheap tester.
Title: Re: Brake Fluid. Moisture Content. Change Intervals. Post by: koko64 on February 20, 2024, 01:47:54 PM The moisture content was verified by my local car shop with a premium Wurth device. The car shop is a certified vehicle tester and my device (Repco) had the same reading. So the new fuid (Castrol) passed but still registered a small % of moisture below the threshold (<1%). The devices are therefore very precise and sensitive.
Title: Re: Brake Fluid. Moisture Content. Change Intervals. Post by: koko64 on February 20, 2024, 01:59:53 PM I always changed my brake/clutch fluid on the bike every 18 months, yes, that much humidity and in my car Interesting. Melbourne's summer has had tropical humidity this year and a very high dew point. The customer's bike was sweltering in a tin shed. Might have to change to Panama specs. ;D Title: Re: Brake Fluid. Moisture Content. Change Intervals. Post by: DarkMonster620 on February 20, 2024, 05:41:46 PM Interesting. Melbourne's summer has had tropical humidity this year and a very high dew point. The customer's bike was sweltering in a tin shed. Might have to change to Panama specs. ;D [thumbsup] [beer] |