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Author Topic:  Brake booster check valve  (Read 339 times)

Offline ThePresidential

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Brake booster check valve
« on: December 24, 2022, 03:08:11 PM »
I need to replace my brake booster check valve because it’s leaking. The check valve has a hose going to the brake booster, a hose to the vacuum source, and another hose connecting to the intake pipe.

My question is when i replace the valve can i just connect it to vacuum? Or do i need a 3 port one that connects to the air intake? What is the need to have it connected to the air intake?
« Last Edit: December 24, 2022, 03:13:42 PM by ThePresidential »
2013 Lincoln MKS Ecoboost | Oil breather | spectre CAI | Needing to install catch cans | 160 thermostat |

Offline ridered74

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Re: Brake booster check valve
« Reply #1 on: December 27, 2022, 09:48:55 AM »
Need is a really strong word....not sure why they have it going there, but I know a bunch of people plugged that part of it a couple years ago when a lot of people were noticing hissing sounds from that connector. Never heard of any ill effects from it, so I'd say you should be fine removing that connection.
Gearhead E30 tune, Gearhead intercooler, LMS firestorm hpfp, catted downpipes, corsa catback, 160 degree thermostat, 3 bar map, upgraded AD trans mounts, MSD coils, Nitto 555R drag tires on front, AR924 wheels and BFG sport comp 2 summer tires on rear, and an EPP intake.

12.2479 @ 118.05 fastest trap
11.591 @ 114.89   fastest ET

Offline Macgyver

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Re: Brake booster check valve
« Reply #2 on: December 27, 2022, 12:26:35 PM »
My SHO had that part that hissed. I left it alone.

Offline ThePresidential

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Re: Brake booster check valve
« Reply #3 on: December 28, 2022, 05:41:18 PM »
Need is a really strong word....not sure why they have it going there, but I know a bunch of people plugged that part of it a couple years ago when a lot of people were noticing hissing sounds from that connector. Never heard of any ill effects from it, so I'd say you should be fine removing that connection.

Yes i dont need it, its not throwing any codes. But its a small vacuum leak and i dont like to hear a leaking air sound. And i would like to see my ling term fuel trims as close to 0 as possible.
2013 Lincoln MKS Ecoboost | Oil breather | spectre CAI | Needing to install catch cans | 160 thermostat |

Offline ridered74

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Re: Brake booster check valve
« Reply #4 on: December 31, 2022, 09:50:18 PM »
Need is a really strong word....not sure why they have it going there, but I know a bunch of people plugged that part of it a couple years ago when a lot of people were noticing hissing sounds from that connector. Never heard of any ill effects from it, so I'd say you should be fine removing that connection.

Yes i dont need it, its not throwing any codes. But its a small vacuum leak and i dont like to hear a leaking air sound. And i would like to see my ling term fuel trims as close to 0 as possible.


My long term trims were 1.14-1.18 the entire time I owned my car. If they're still off after you fix that hissing sound, good chance it is your fuel pressure sensor. Those seem to go bad pretty often and cause the fuel trims to be off.
Gearhead E30 tune, Gearhead intercooler, LMS firestorm hpfp, catted downpipes, corsa catback, 160 degree thermostat, 3 bar map, upgraded AD trans mounts, MSD coils, Nitto 555R drag tires on front, AR924 wheels and BFG sport comp 2 summer tires on rear, and an EPP intake.

12.2479 @ 118.05 fastest trap
11.591 @ 114.89   fastest ET

Offline ThePresidential

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Re: Brake booster check valve
« Reply #5 on: January 04, 2023, 04:29:27 PM »
Right now mine got down to 3.1 and 3.9, would bad cats affect your LTFT? Im waiting so i can get downpipes to replace mine.
« Last Edit: January 04, 2023, 04:31:10 PM by ThePresidential »
2013 Lincoln MKS Ecoboost | Oil breather | spectre CAI | Needing to install catch cans | 160 thermostat |

 


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