Question about 1994 Ford F250 Supercab
The problem you are describing is the exact symptoms of a faulty master cylinder. This may occur while holding your foot on the brake pedal at a stop light. If the pedal goes slowly down, it means the master cylinder is not holding pressure. This is also a potentially dangerous condition because a worn master cylinder or a leak in the hydraulic system may cause the brakes to fail. It will also cause your brake light to flutter on and off
Posted on Sep 09, 2010
Check your Vacuum Reserve Cannister for rust. This part is like a Coffee can with vacuum fittings. Then check your Vacuum pump for performance. You should have some pressure at idle, I do not know your models specs but I would hope its in the Teens.
With the engine running use a water spray mist from a spray bottle around your Vacuum Brake Booster. Actually, try spraying every vacuum line and if there is a leak the engine will change RPM as it draws in the water. There should be no leaks.
While there may not be air in the Brake system, there may be condensation or a contaminant. You may also have a Master Cylinder leaking fluid within. When you push down on the Master C, the fluid pressure is suppose to stay downward of the valving. If the valving leaks, it allows the pressure from the High pressure side to return to the reservoir without you lifting your foot off the pedal.
The gradual brightening of the warning light can be a dirty contact inside the warning sensor. Or it can be a corroded plug connector on the outside of the sensor. The ABS warning light can be showing you pad problems and fragmented, loose pads can do this.
Finally, the Emergency brake pads, whether used or not, can rust off and roll inside the drum portion of your rear Rotors. The Brake shops often will not check this unless they are pulling off the rear Rotors. The E brakes are hidden and can not be seen without disassembly.
Would like to know what you found out about this problem.
Posted on Sep 08, 2010
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Posted on Jan 02, 2017
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