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M7 w/ mushy brakes

The brake lever on my buddies M7 sometimes loses pressure and goes to the bar. When this happens there is obviously no brakes. It only happens at low speeds. Most the time the brakes seem spongy but still function. Any tips on how to fix this or where to begin?
 
If there is no air in the system, sounds like the master cylinder is going or has gone out.
 
Low on fluid, moisture in fluid, or dirty fluid can all show these symptoms. Flushing the system and installing new fluid should help. An M7 is certainly old enough for the fluid to fail more than once if it has never been freshened.
 
For sure flush brakes and bleed air out. After that if you can pull the lever in and it slowly loses pressure you are leaking at the master cylinder and need to rebuild it.
 
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