P0556 Brake Booster Pressure Sensor Circuit Range

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gural

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Hi
During longer travels and higher speed i got a info "check brake system"
and when during the ride and check on the trouble codes i get P 0556
After stop and runing the car once again it gone
I do not even see it as a trouble code

did any one got similar problem
Im thing about replacing the
"Power Brake Booster Vacuum Sensor" - FL3Z-2C444-B / FL34-2C444-AB

i have seen the post
but as i check the catalog sensor here is a seperate part
 

BMW2FORD

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Wow, I just had this happen to my 2018 as well after long Interstate drives around 70-80mph. I’m planning to check the electrical connector pin drag and look to be sure the vacuum hose and booster check valve is clean inside and free cracks and then maybe replace the sensor and check valve. I never got an Advance Trac message but see the code when scanning the car in routine checks.
 
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gural

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so basicly i do not have a idea how to check the vacuum hoses going to Brake Booster (other hoses i was using the vacuum pump) but here the whole system is connected with air system to engine
The only way i see it to check if there are no visible brakes

But i think i will go Your way and first check the wiring going form the ABS pump - this is the most vunerable element that the animals can demage

thanks and i will let You inform if i found something
 
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gural

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Hi
I am after full computer dianostics
we also check the wiring + vacuum lines
it seems that the sensor from sometimes to sometimes get error

so basiclly i will order a new sensor and replace him and check if it apparce once again

Others in EDGE and F150 had same problem
Found it on net
 
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gural

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so basiclly
i have changed the sensor and i still got same problem
during the weekend i will try once again to check the vacoom pipes and wirering (does any one got schema of wiring goting from sensor to other places)

but i assume that it will finish with changing the whole brake booster
 
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gural

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so to update
I found on the youtube a person which had same problem in f150

and thou i did not have special equipment then i took a normaln pump and mans shaving cream
i put a cream on brake booster and by the pump added air
i heard a small hiss and saw that in one place the cream started to flow

i my opinion the breake booster have a same kind damage neext to the the master cilinder

I already ordered the brake booster
after the replacment i will update
 
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