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Brake light when going uphill

 
  #1  
Old 04-08-2019, 03:44 PM
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Brake light when going uphill

Hey Everyone,

So I have a strange issue that I can't seem to figure out. So, I'll start by saying that the brake fluid reservoir is full and that all brake pads are in good shape (I checked them over the weekend).

When I am driving uphill for about 1/2 - 3/4 of a mile my check brake light comes on and dings 3 times. This doesn't occur any other time and doesn't occur on short hills. There is no loss of braking. I can stop normally or stomp on them and the truck stops as it normally would. Once I stop, and restart the truck the light is gone until the next hill.

I did have one instance where I was driving uphill, the light came on and someone swerved in front of me. I hit the brake pedal (which was VERY firm) and the truck barely slowed down. That was the one and only instance of an issue.

I have tried grabbing codes when the light is one but there isn't anything showing up.

Any thoughts?

Thanks in advance
 
  #2  
Old 04-08-2019, 04:42 PM
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glc
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What are you working on?
 
  #3  
Old 04-08-2019, 06:05 PM
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2011 Ford F-150 Supercrew FX4

Check your brake fluid!
 
  #4  
Old 04-08-2019, 06:13 PM
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Sorry, 2011 f150 supercew with the 5.0

Brake fluid is full and at all calipers. I bled them to make sure there wasn't air in the lines
 
  #5  
Old 04-08-2019, 09:22 PM
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I'm wondering if there was hydro static shock damage that damaged the sensor when you pulsed the brake to avoid a collision with that car. Just as wild-a-guess.
 
  #6  
Old 04-09-2019, 08:13 AM
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Originally Posted by ManualF150 View Post
I'm wondering if there was hydro static shock damage that damaged the sensor when you pulsed the brake to avoid a collision with that car. Just as wild-a-guess.
ManualF150 - would this trip the ABS warning light also if it occurred? For as cheap as these sensors are 'm willing to replace them.

The truck drives fine still but I pull a 7,200lb trailer and we're heading into camping season so I'm a little nervous about this issue.
 
  #7  
Old 04-09-2019, 09:29 AM
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No, if it's just the fluid sensor, then no.

I'm tempted to say replace just that sensor, but I'm not really sure without looking at it.

See what happens if you disconnect it and turn the truck on. See if you get anything different.
 
  #8  
Old 04-15-2019, 08:52 AM
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So I was able to crawl under the truck and give it another go through this weekend and found something suspicious. There is a sensor on my rear differential housing on the top that has wires that trace in with my brake lines. I'm taking this to be the rear ABS sensor. There is about a softball size area around that sensor that is covered in oil. It's not soaked or visibly running but appears to be a very slight leak over time.

Is this normal for the sensor? I've already ordered this part to attempt to replace it for $35. If it is this sensor any ideas why it would only trip when going up a long grade?

thanks everyone!
 

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