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Old 03-29-2020, 10:00 AM   #1
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Spongy brake pedal

On our 2015 E450 Super Duty. It's not bad - and it's only the first push. But it is softer that I think it should be. Pedal goes farther down that I think it should.


Second pump and it's fine.


Thoughts on what to check?
I'll head out today and check fluid level, but assuming that's fine - what next for a home mechanic with *some* skills?


Thanks
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Old 03-29-2020, 10:36 AM   #2
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I doubt its low fluid level. If it was you would have all kinds of lights on, e brake, abs, cel,.. if you dont have any leaks, and I would look at the insides of the wheels for fluid, I'd almost think you got a brake hose(s) the come off the caliper(s) going bad.
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Old 03-29-2020, 11:52 AM   #3
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On disc brakes, the caliper piston seals retract the piston when you let off the pedal. You're right to check the fluid first, and if it's low, and there are no visible leaks, it may be the pads, and/or the rotors are worn down. When you apply the brakes, the piston has to travel that much farther to push the pads onto the rotor.

When you check the brake fluid, the rear section of the reservoir is for the front brakes, and the front section is for the rear brakes.

What I look for in your case, in order would be:
1) Low brake fluid in master cylinder.
2) Visible fluid leak around the calipers, hoses, and steel lines.
3) Worn pads and rotors.
4) Air in the system, bleed all calipers.
5) Brake hoses to the calipers may be soft, and swelling slightly under pedal pressure.
6) Master cylinder leaking into the vacuum booster.

Maybe these might help you find the reason for your low pedal/first push.
Let us know what you find out, so it may help someone else that has the same question.
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Old 03-29-2020, 12:50 PM   #4
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well I did some googling and the Ford forums are *filled* with similar complaints! They're solutions are a bit more involved than I can handle.

I'll try the simple stuff first
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Old 03-29-2020, 12:56 PM   #5
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Quote:
Originally Posted by pconroy View Post

I'll try the simple stuff first
That's the best way. You might be surprised, and find an easy fix on yours. One step at a time, before it gets to the complicated stuff. Good luck.
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Old 03-29-2020, 03:49 PM   #6
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Start with the brake fluid level. As your brakes wear down, the cylinders hold fluid. Which lowers the level in the master cylinder reservoir.

This could he a sign your front brake pads are well worn and should be replaced.
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