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Brake fluid usage?

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Old Mar 16, 2022 | 06:44 PM
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island eddie's Avatar
island eddie
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Brake fluid usage?

2011 F-250 SD 6.2 FX4
120K
It seems I am using fluid, but can see no leaks.
I have to top it off a few times a year.
All new brakes, rotors, etc @ 100K

It seems to me it uses more than any truck/car I've ever owned, but too, its the first 3/4 ton I've ever owned.
Not sure, but I don't recall it uses fluid like this when I first bought it.

Any ideas?
I pull my travel trailer and need my brakes
 
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Old Mar 16, 2022 | 06:57 PM
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Brake system is a sealed system and should not need topping off. You have a leak somewhere.

If you dont see any fluid seeping from the lines, fittings, bleeders, then id suspect a caliper piston seal is weeping.
 
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Old Mar 16, 2022 | 08:16 PM
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Originally Posted by OverheadCram
Brake system is a sealed system and should not need topping off. You have a leak somewhere.

If you dont see any fluid seeping from the lines, fittings, bleeders, then id suspect a caliper piston seal is weeping.
Yeah, I thought perhaps the brakes on a 250 are heavier, and wear more, requiring more fluid to travel, maybe. I don't find comfort in such reasoning.
Also, I believe my brake pedal is not as stout, a little spongy perhaps, that I think will actually keep depressing a little if I stand on it hard, not that I slammed my brakes.

Thanks for your reply!
 
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Old Mar 17, 2022 | 03:52 AM
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As your pads wear down more fluid will fill the gap in the caliper piston but it should never be to the point where you have to actually add fluid. New pads should return your fluid level back to the full mark on the reservoir.

Check around, you'll eventually find a leak based off of what you described is going on.
 
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Old Mar 17, 2022 | 11:57 AM
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If you can't find the leak, you may want to remove the master cylinder the seal on the rod may be leaking, especially since you said the pedal is spongy.
 
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Old Mar 18, 2022 | 10:21 AM
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A slow sinking pedal is an indicator that you need a new MC. Unexplained brake fluid loss is an indicator that the MC should be inspected.

I think the MC should be examined, as a start anyway.
 
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Old Mar 18, 2022 | 11:09 PM
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Usually, if the Master Cylinder is leaking you'll find dripping on the frame rail below it. My 2002 MC located on the drivers side has a slow leak and I have the parts to replace it. It doesn't leak a lot of fluid but enough to make the metal wet-ish below it. Anyway, on my 2002 it is the ORIGINAL MC so it's time to change it out.
Peace-out,
 
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Old Mar 19, 2022 | 10:40 AM
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Thanks guys.....appreciate the replies, I will get it fixed for sure.
 
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