Vacuum pump or master cylinder? - Ford Powerstroke Diesel Forum

 
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post #1 of 3 Old 08-29-2013, 12:00 PM Thread Starter
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Vacuum pump or master cylinder?

Hey guys my truck has lost brakes at times. My brake light will come on and stay on after I use them and when I speed up it goes off. When I first use them after awhile I have rakes but if I let off and push the, again she is hard as a rock and it acts like I using my brakes like the truck was off and had no power to them. Any suggestions and any ways to test vacuum pump so I don't just go buy a new one?


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post #2 of 3 Old 08-29-2013, 06:05 PM
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Check all hoses and manifold for possible leaks. Put a gauge on the vacuum manifold and you should see 17-24" Hg at idle. I would lean more to the pump being bad based on the description. Cheers!

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post #3 of 3 Old 08-30-2013, 01:01 AM Thread Starter
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Ok awesome! Thanks

96 7.3 F350, 4x4, 5 speed, 6 inch skyjacker lift, 35 12.50 M/T Baja Atz, custom TW 6 pos, Banks Intercooler, BDP experimental fuel system, banks double shot water meth, Chromoly Push Rods, Swamps IDM Mod, 2nd Gen Wicked Wheel, Stage II AFE cold air intake, Down Piped 5 inch Diamond Eye exhaust, Gauges, ladder bars, upgrades drives lines yokes, on board air system, triple trumpet train horns, smoked head light and taillight housings, and 55watt HID kit!!
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