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1991 GMC K1500 - Page 5 Questions & Answers
4x4 actuator
What you can try doing is purchasing just a new connector that if you can still use the same actuator. They do sell them depending on the year of your truck. Or try a junk yard.
Gm serpentine belt routing
There's a routing diagram sticker under the hood. Look for it on the radiator support , the front shock tower or on the hood itself.
type this on google and see what you get...gmc k1500 serpentine belt routing diagram
Brake failure
If you are talking about the brake pedal being stiff and too hard to push, then working easily again - it sounds like you temporarily lost the power assist. This will happen again and it is not safe to drive until properly repaired.
Many decades ago cars had no power assist and took much more foot pressure and much longer distance to stop. So your brakes were working, just not the assist.
The power assist is provided by a vacuum line from the engine. The likely causes of the failure are: stalling or stopped engine, leak in hose from engine to brake assist booster or leak in the diaphragm inside the brake booster. There are also other much less likely causes from brake fluid lines and the master cylinder. Regardless, don't drive knowing the brakes are likely to fail.
Fuel injector pump not working
If It has fuel injection it can be the fuel pressure valve, that hold the fuel pressure on the reel with the injectors. you can check it bi clamping the fuel return line so it can not flow (to see if the fuel is just going around back to the tank with out making pressure), and se if it can run but it is just to check it out, the valve can be stuck after the fuel filter was full and pass some dirt thru the system. but i don't know this type of car, just passing some ideas
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