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2005 F-250 CC LWB Low Brake Fuid Level indicator

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2005 F-250 CC LWB Low Brake Fuid Level indicator

 
  #1  
Old 08-24-2010, 06:00 PM
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Talking 2005 F-250 CC LWB Low Brake Fuid Level indicator

Need some help. '05 F250 6.0 CC LWB. about a week ago, my "Brake Fluid Level Low" warning in the information window came on. Simultaneously, the red "Brake" warning light came on on the instrument panel. I was just sitting at my sons footbal practice idling. Along with the visual indicators, there is an annoying "beep" as well every time the light illuminates. So I checked the master cylinder fluid level....completely full!! Brakes work fine. When I got home...did some research and found out about the "fluid level sensor".....so I unplugged that. That worked initially....then today, the same thing happened coming back from Home Depot. More research led me to a possible "Low Vacuum Sensor" Anyone have any insight? Can't find the location of that sensor in My Haynes manual nor from any reference online.
 
  #2  
Old 08-24-2010, 08:38 PM
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This one is hard to diagnose from a computer, but one question, is the parking brake fully released and contacting the parking brake switch?
 
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Old 08-25-2010, 11:48 AM
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Yes Parking Brake is completely against the rubber stop and have checked switch. This morning I found that the air restrictor gauge had come out of the Intake assembly, bought new gauge, new OEM air filter and replaced both. Was thinking it could have resulted in a "low vacuum" signal which I assume since that and the power booster on the brakes are tied together, the system thought "low brake fluid"
 
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Old 08-25-2010, 11:49 AM
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But still getting "Low Brake Fluid Level" on idiot display on dash, and Red Brake light is still staying illuminated.
 
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Old 08-25-2010, 12:59 PM
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If you have a good brake shop near you as I do I would stop in and see them, sounds like you could be leaning to an ABS problem, but I am long shot guessing.
 
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Old 08-25-2010, 03:13 PM
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Your brake booster is power steering driven. How is your power steering fluid level? (total shot in the dark)
 
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Old 08-25-2010, 04:16 PM
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Rgr, I thought about that too. I have checked the PS fluid as well. It is good to go. I even re-checked it today after I replaced the air filter and Air restriction gauge. I am continuing to check options, but if anyone else has any suggestions/ guidance, I am all ears. Thanks!!
 
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Old 08-25-2010, 07:24 PM
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Have you ever flushed the brake system? Did my 05 a year ago and it took 4 qts. of fluid to clear it out. Dot 3 is hydroscopic and absorbs moisture from the air and then goes down hill from there. If it were mine that is where I would start. Your fluid could be contaminating the sensors.
 
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Old 08-25-2010, 07:34 PM
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Thanks....actually hadn't thought about that aspect of it. i will look into that tomorrow and see if it helps/ corrects the issue. In your opinion, what is the easiest way to flush these trucks? Whole master cyclinder assy is much different from my previous 1976 Chevy K-10. Any tricks of the trade for this set-up?
 
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Old 08-25-2010, 07:42 PM
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Drain what you can from the master cylinder and then refill. Start draining from the furthest wheel, right rear, then left rear then front right and then left front. Do not let the fluid level in the master get below the half way molded seam on the container or you risk sucking air and starting all over. If you are in no hurry the S.D. is self bleeding, gravity. I used Prestone Dot 3 synthetic. A little less hydroscopic. Good luck.
 
 
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