BRAKES - Need help...

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Jul 21, 2019 | 02:57 PM

NStorm

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From: Corn Country, Kansas

BRAKES - Need help...

Guys, '17 F350 (signature truck) at a stoplight this morning brakes got hard, now the pedal is nearly solid, parking brake light on, check brake system warning on the dash. Any ideas? Feels like anti-locks are engaging when slowing down, really need to mash the pedal. Appreciate your thoughts.

Jul 21, 2019 | 03:10 PM

Sport45

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From: Too close to Houston

Check the vacuum line going to the brake booster. At least that’s where I’d start.

Jul 21, 2019 | 03:37 PM

ATC Crazy

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From: SW VA

Quote:

Originally Posted by Sport45

Check the vacuum line going to the brake booster. At least that’s where I’d start.

It's a diesel. It's hydroboost

Jul 21, 2019 | 03:49 PM

Sport45

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From: Too close to Houston

Yeah? Mine’s diesel and it certainly looks like vacuum feeding the booster. Comes off the same manifold as the feed for the automatic hubs.

Mine is a 2019 though. That might be the difference.

Jul 21, 2019 | 03:52 PM

NStorm

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From: Corn Country, Kansas

Would a cracked brake fluid reservoir lid do anything? Shouldn't right? Does that chamber hold a vacuum? Just noticed mine is cracked.

Jul 21, 2019 | 03:59 PM

ATC Crazy

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From: SW VA

Quote:

Originally Posted by Sport45

Yeah? Mine’s diesel and it certainly looks like vacuum feeding the booster. Comes off the same manifold as the feed for the automatic hubs.

Mine is a 2019 though. That might be the difference.

Well that is interesting. All the info I've ever read here was that all diesels were hydroboost. Hmmm...learn something new every day...Thanks

Jul 21, 2019 | 04:05 PM

ATC Crazy

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Joined: Jun 2003

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From: SW VA

Quote:

Originally Posted by NStorm

Would a cracked brake fluid reservoir lid do anything? Shouldn't right? Does that chamber hold a vacuum? Just noticed mine is cracked.

It shouldn't. All that reservoir does is just hold the fluid.

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Jul 21, 2019 | 04:18 PM

Sport45

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From: Too close to Houston

Quote:

Originally Posted by ATC Crazy

Well that is interesting. All the info I've ever read here was that all diesels were hydroboost. Hmmm...learn something new every day...Thanks

Might be the dually trucks get hydro boost? With a SB configuration the OP’s truck has to be SRW.

Jul 21, 2019 | 04:51 PM

#10

NStorm

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From: Corn Country, Kansas

I got it. Vacuum line down below the master was disconnected. The hood was replaced last week (hail repair) they must not have made it "click". Thanks team.