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Brake Vacuum Loss

Messages
23
Likes
4
Location
Encino
State
CA
Country
United States
What I Drive
1999 Lexus GS 400
#1
Hello all,
On my 2018 GT2 in the last couple days I've noticed that when the car sits overnight the brake pedal is hard on startup in the morning. It doesn't seem to happen during the day, and brakes work fine otherwise. It is presenting like a slow leak somewhere in the vacuum line or booster. But I don't even know if this car has the same conventional brake system as older/other vehicles. Has anyone here had an experience like this?
Thanks for any input.
 


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