I cannot locate the brake booster check valve in my 2008 Lexus ES 350.
I brake is very hard to press and I’m trying to troubleshoot whether it is the check valve that is bad or the brake booster itself. I manually try to vacuum on the brake booster, but it did not work however, when I turn the car on the brake perfectly works fine. The only issue I’m facing is that the break is very hard to press as soon as I turn the car off. Which tells me that the vacuum is leaking somewhere.
I just want to eliminate the check valve, but cannot locate it anywhere. Normally it’s located on the vacuum hose that goes from the intake manifold to the brake booster but on this car, there is no check valve on that pipe and I did check that vacuum pipe which has no leaks.
Seems like it is a pretty common problem on this car, but I have not seen any issues on YouTube or anywhere. Please share what you found on yours.