Is the brake master toast?

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Jan 14, 2010
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I have been working on the 78 FJ40 and finally got to the brakes. While bleeding the rears, upon initial pedal application I get slave pressure but it bleeds down while the pedal is fully depressed. I am not getting any air out of the system other that what I got out of it when i first started bleeding the brakes. Seems like a check valve might be sticking too. This FJ has been sitting for quite a while.
Thanks
Justin
 

piecemeal

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unbolt the master and check the pushrod coming out of the slave and see if it's wet. If so, it could be leaking fluid into the slave ( I had about 1/3 a quart in mine and before I figured out what was going on). If it is wet, then you could rebuild the master or buy a new one. Pull out the pushrod and while you got the master disconnected, get a rubber stopper and plug the hole where the pushrod was on the slave, disconnect the vacuum line and apply vacuum to the slave and see if it holds..... Mind you I did this on my 74 and I think the brake system, at least in the engine bay less drums vs discs, is similar. Good luck!!
 
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