Question about 1991 GMC C1500
Gravity bleeding doesnt usually work real well.
Get a clear jar of some type, and a piece of 1/4 inch vacuum hose about 18 inches long. Put about 2 inches of new brake fluid in the container.
Start at the passenger rear wheel, losen the bleeder, slide the hose tightly over the open bleeder, the other end in the jar where you can see the hose end.
Fill master cylinder reservoir.
Pump brake no more than 4 times, watching the hose end in the jar for bubbles. After 4 pumps, check reservoir, refill. Pump 4 more times. Watch for bubbles. Check reservoir, pump 4 more times. If you see bubbles at any time, then keep going through the above steps until you stop seeing bubbles.
Go to rear wheel, tighten bleeder. Go to driver rear wheel, and do the same thing, although this time it won't take but 4-6 pumps to purge any air.
Go to passenger front, repeat.
Go to driver front, repeat.
Do not recycle any of the fluid.
Posted on Jan 28, 2009
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Posted on Jan 02, 2017
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