Brake Booster Check Valve

[limitwheel]

My 2016 Genesis sedan needs a new brake booster check valve.
As far as I can see, this check valve is part of the vacuum hose assembly # 59130-B1010.
Has anyone replaced this assembly or just the check valve with an aftermarket such as ATE 990033 check valve?

PS: The vacuum booster works just fine, its just after a few hours the vacuum assist is depleted but otherwise the brakes work fine.

 

[joegr]

Have you verified that it is really the check valve, and not a small leak in one of the valves in the booster?

 

[limitwheel]

I've done the brake booster tests and it passes.
The brake pedal feels normal when driving.
After the car is parked for a few hours, the brake pedal is very stiff until I start the engine.

 

[joegr]

I've done the brake booster tests and it passes.
The brake pedal feels normal when driving.
After the car is parked for a few hours, the brake pedal is very stiff until I start the engine.

I think that you are just talking about the functional test, which says nothing at all about if there are any small leaks.
Get a hand vacuum pump and gauge, and connect it to the booster. Pump it down, and and note the needle position of the gauge. Check it again after several hours to see if it has lost any vacuum. You can do the same thing with the check valve to verify if it really is leaking or not too.

 

[limitwheel]

Great idea about pulling a vacuum at the booster and leaving it for few hours and checking for leaks several hours later.

 

[limitwheel]

So after pulling a vacuum directly at the brake booster for a few hours there was no vacuum leak.
That leaves the booster check valve.
After searching for it for a while, I found this booster valve is nothing like a traditional booster valve.
It is piped into the brake booster piping and intake manifold and throttle body intake plenum with multiple ports.
This is the page from the manual that shows the piping attached to the valve. The valve is left of center.
The valve has 4 nipples with the upper left one capped. The top right goes to the booster. The lower right goes to the intake manifold and the lower left goes to the throttle body intake plenum.
I've searched all over and I'm unable to locate just the valve. It looks like I must buy the complete upper hose assembly.

 

[joegr]

That looks like the valve that my LS used. I think that is a fairly standard way to do it for several car brands since at least 2000.
You could always cut the hose to the brake booster and insert a "normal" check valve there.

 

[G-105335]

But if the problem is a sticking check valve in the line, that does not fix the issue.....

 

[joegr]

But if the problem is a sticking check valve in the line, that does not fix the issue.....

Perhaps you are not understanding the suggestion...

 

[tomkaiawe]

sorry for the duplicate. trying to delete it.

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[tomkaiawe]

So after pulling a vacuum directly at the brake booster for a few hours there was no vacuum leak.
That leaves the booster check valve.
After searching for it for a while, I found this booster valve is nothing like a traditional booster valve.
It is piped into the brake booster piping and intake manifold and throttle body intake plenum with multiple ports.
This is the page from the manual that shows the piping attached to the valve. The valve is left of center.
The valve has 4 nipples with the upper left one capped. The top right goes to the booster. The lower right goes to the intake manifold and the lower left goes to the throttle body intake plenum.
I've searched all over and I'm unable to locate just the valve. It looks like I must buy the complete upper hose assembly.
View attachment 43777

Good info. I have a 2017 Genesis G80 3.8 and received a P0504 using the OBD2 scanner, (long story) which led me to your page. Yes, I would replace the entire hose. Why? I would not skimp on Genesis parts. The computer that controls the SCC (smart cruise control) controls the entire system and it includes the brakes, because the SCC uses it. So, using a generic part, the computer may or may not recognize the generic part. If it doesn’t it will keep the error code of P0504 in the system. It won’t display the error on your screen. If it works, then fine. But, I myself try to keep everything original OEM parts.

 

[tomkaiawe]

Good info. I have a 2017 Genesis G80 3.8 and received a P0504 using the OBD2 scanner, (long story) which led me to your page. Yes, I would replace the entire hose. Why? I would not skimp on Genesis parts. The computer that controls the SCC (smart cruise control) controls the entire system and it includes the brakes, because the SCC uses it. So, using a generic part, the computer may or may not recognize the generic part. If it doesn’t it will keep the error code of P0504 in the system. It won’t display the error on your screen. If it works, then fine. But, I myself try to keep everything original OEM parts.

Problem resolved. After 8 months of chasing & tracing 5 different problems on my 2017 Genesis G80, (shifter wouldn't shift out of park, rear shade wouldn't go down, front & rear sensors stopped working, Smart cruise control had an SCC error and hard brake pedal with an error code of P0504). I went back to the beginning of troubleshooting and rechecked all the fuses in the cabin, engine compartment & trunk again. This time I used a multi-meter, instead of eyeballing it. lol. Found it!!! burned-out 10-amp fuse in the cabin fuse box, module 3, top right column. Replaced it with a new 10amp fuse from Autozone in Kapolei. Damn it! all of the above components started working again!! YES!!