i have 87 b2200 put new slavecilender in clutch was fine for 2 weeks now pedal goes to foor and fluid bowel is emty after 15 minute ride cant find leak any help would be nice

 

If the resevoir is going dry then has to have a leak somewhere. It certainly does not evaporate that fast. Pull back the slave cylinder boot and see if fluid runs out. Also carefully check the firewall both inside and out where the master cylinder bolts up to see if it is leaking. If all of these are dry then a line is leaking somewhere.