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My brake pedal hit the floor on the exit ramp coming off the highway, and the brake light came on. I used the gears to slow me down while trying to pump the pedal and it just kept hitting the floor. Eventually some resitance came back in the pedal, and I was able to use the breaks to come to my final stop. The brakes have functioned perfectly since, and iv driven about 200 miles without any problems since. No perceptible change in brake fluid level, no leaky lines that I can see, no splashes of brake fluid on the wheels or chassis. My booster and MC are less than 6 months old. The only brake issues I have noticed that are consistent pre and post the most recent incident, are slightly uneven/bumpy wear on my rotors, and chattery vibrations while breaking hard.

my pads still have a good amount of life in them, and I put new shoes on recently too. What else should I check?? What causes random total brake failure that is temporary??
 

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nmoussal;743687 What causes random total brake failure that is temporary??[/QUOTE said:
moisture in the fluid (in the calipers) that turns to vapor when heated by heavy braking - suddenly fluid becomes compressible vapor

seems unlikely, but a possibility
 

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I would at least bleed the entire system. I have found that the most common issue that I have usually had is the rear wheel cylinders leaking.
So I suspect that at the least you should go through the entire system and verify that you are good....at least bleed them.

I have had master cylinders that fluid goes past the seals and they don't compress the fluid.

Brake fluid is hydroscopic that is it absorbs water, so I would think tha tif you haven't changed it out in a few years now would be the time to do so.
 

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Ues it sounds like you have an air bubble in the lines somewhere.... Take it back to whoever changer the master cylinder and have them bleed the system like they should have the first time they had it.... No telling when it will happen again but gaurentee the air didnt escape the system.. Thankfully enough you had time to react by downshifting and pumping.. Coming to a red light, or traffic jam maybe not so lucky next time.. Dont wait with this problem until a next rime

Sent from my SM-G955U1 using Tapatalk
 

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Ues it sounds like you have an air bubble in the lines somewhere.... Take it back to whoever changer the master cylinder and have them bleed the system like they should have the first time they had it.... No telling when it will happen again but gaurentee the air didnt escape the system.. Thankfully enough you had time to react by downshifting and pumping.. Coming to a red light, or traffic jam maybe not so lucky next time.. Dont wait with this problem until a next rime

Sent from my SM-G955U1 using Tapatalk
You know what they say about brake issues? You meet more folks by Accident.
 
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