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I have a 2009 scion tc manual trans. My brake pedal intermittently sinks to the floor. There are no fluid leaks we installed a new master cylinder and bled the brake system twice. And STILL the brake pedal randomly will sink to the floor.
what else could be causing this to happen??
 

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You could have a brake caliper leaking. I blew out a caliper and replaced it, but when I did I couldn't get a pedal and has weak brakes so the car would struggle stopping. I eventually had to replace the master cylinder also and that helped my issue out. It's possible that the brake booster could be going out but I don't know of anyways to test them.
 
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