Why Your BRAKE Master Cylinder Randomly FAILED After BLEEDING Your Brakes

If you have been working on cars long enough, chances are high that you have been in this situation: You just repaired a brake caliper, line, or wheel cylinder. All of your work is wrapped up. Now the last thing you need to do is perform the brake bleed. During the process of the brake bleed you feel something strange with the brake pedal in the master cylinder. Now you suddenly lose brake pressure and flow from the master cylinder.
So you find that the brake master cylinder failed. But WHY? It was working perfectly fine before the repairs, why did it suddenly fail?
Recently I had the brake master cylinder fail on my son's 1972 Barn Find Chevelle. Once I had the master out, and apart I took a few minutes to run through the cause of the failure.
Be sure to like, comment, and share the video! I greatly appreciate the support from those of you who have subscribed. If you haven't subscribed to the channel please consider doing so.
~ Nick
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Take a peek at some of my additional projects & content that you may enjoy:
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About AutoTechNick:
Growing up in rural Oregon, I was always around Hot Rods & Race Cars. I imagine my early exposure to this culture ignited a spark of interest in cars, which remains my passion.
🎓 I am a proud Alumni of Wyoming Technical Institute @WyoTechAutoMechanicSchool where I studied Automotive Technology, Performance Engine Building & Street Rod Fabrication. In addition to "WyoTech," I graduated from the BMW Service Technician Education Program, more commonly known as BMW S.T.E.P.
🏎️ I spent nearly ten years working in various BMW dealerships as a Master Technician. After a move back home to the PNW, I found myself no longer servicing German-made machines but now working with Italians. I spent nearly another ten years as a Ferrari Master Technician & Shop Foreman at a local Ferrari dealership.
🏆 Ferrari selected me as one of 12 technicians worldwide to compete in the "Ferrari Testa Rossa Awards" for four years consecutively. Finishing in 3rd place in 2016, & in 2019 I was able to place in 1st, winning the competition & earning the title of the "Top Ferrari Technician in the World!"
🚀 As my time with Ferrari came to an end, a new career path awaited me…. Aerospace. I am currently working at Blue Origin, helping to build & develop the BE-3PM and BE-3U rocket engines.
With my new career path, I needed an outlet for my automotive passion, thus the reason for this channel…
#brakeservice #brakerepair #brakefluid #autotechnick #diy #themoreyouknow

[@AutoTechNick]

I am curious to know, how many of you have had a master cylinder fail while attempting to bleed/ flush your brakes?
~ Nick

[@kylemalloy]

I just had this happen to me on my first ever brake job after pushing out a caliper piston to replace the boot and thought I was losing it...thank you 🙏 very timely video

[@bryanfyler3921]

Great stuff Nick! Keep up the great work. For those that never considered why this happened, this will answer your questions.

[@vrt4k864]

Top tier video, but I expect nothing less at this point. Keep up the great content creation!

[@AutoTechNick]

Thank you, much appreciated!
~ Nick

[@user-bt6hh9yu1n]

Hydrophilic means it attracts water, hygroscopic describes its ability to absorb moisture. I know, splitting hairs, but from a technical perspective it probably matters to an engineer.