Lost power assist !!!! 1970 GMC Truck - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-14-2003, 06:47 AM
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Unhappy Lost power assist !!!! 1970 GMC Truck

My 1970 GMC C10 With a 1985 305 CI form a Monty Carlo. Had a Cast iron Manifold and a 2-barrel carb. I change the intake manifold and Carb to a Ofenhowzer (how ever it is spelled) and a 60 model 4 barrel carb I also changed the points dist to a HEI in the process I lost the power assist for my brakes! I have hooked the line to the same port on the back of the carb and to the port in the back of the manifold. If I drive a good distance without using the brakes it builds up some but goes away instantly when I press the brakes. is the 4 barrel lowing the vac enough that it is killing the brakes? If I plug the ports with my finger I feel vac so I know it is getting there. What is the line that runs to the trans is this for the shift timing? Because the trans seems to shift fine. <img src="graemlins/crash.gif" border="0" alt="[crash]" /> HELP no brakes SUXS!!!!!!!

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Old 04-16-2003, 06:20 AM
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Help please!
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Old 04-16-2003, 06:46 AM
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The first thing to check is the vacuum line up to the booster. Make sure the hose is not squeezing itself closed. Next item to check would be the check valve at the end of the hose. It could be malfunctioning. Now check the booster to see if it hasn't developed a leak. Pump the pedal several times when the engine is off and hold the pedal down. Start the engine and you should feel the pedal pull down slightly.....if so the booster is working.
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