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Hi All, 

      My 2015 RX350 ran fine until last month.   I did some shopping and when I came out to start the car, the brake pedal was very hard to depress, so I could not press the start button to start the car.   I had a friend come over and push the pedal down, started the car, and it didn't happen again for a few weeks.   I searched some forums and found that its probably either the check valve on the vacuum booster, or the booster itself leaking.  Since it happens rarely and I can park the car for days or a week and it doesn't happen, seems to be that it is probably the check valve.  Dealer won't give me a price to first replace the check valve, they just want to do open ended diagnostics.  I can't see how they can diagnose this if it happens once a month!   i think they want to run the bill up.

      Has anyone had this problem, and if so, any idea what a reasonable dealer would cost to first replace the vacuum check valve, grommet and vacuum hoes?  Best I can estimate its about 100.00 in parts, for real lexus parts.

Thanks!

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