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no vacuum to anything but brakes

3K views 12 replies 4 participants last post by  illflem 
#1 ·
Well like the title says my dads truck is only sending vacuum to his brakes his exhaust brake, 4wd, cruise, and vent settings done work is there some thing that would cause this or is it just the vacuum pump going its making 14 pounds or whatever of vacuum on the line going to the master cyclinder.
 
#5 ·
What level of vacuum is it supposed to make my dad seems to think its not making enough and his parking brake light is staying on
 
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