1986 s10 blazer
 

a few months ago i put a new clutch kit in my 86 s10 blazer and it worked great other than the lid on the res was leaking so i replaced the res including the lid and button grommet all worked fine for a couple weeks then the clutch would periodically loose pressure and then work fine again well i ended up stuck on the side of the freeway cause i could not get pressure at the pedal and the clutch would not operate through research i found i needed a new master cylinder so i re placed it following the haynes repair manual finishing the job by bleeding the system until only fluid was coming out of the bleed valve on the slave cylinder how ever the clutch pedal is still not building pressure and will not operate any ideas?