No green start light without pushing brake pedal very hard
#1
Intermediate
Thread Starter
No green start light without pushing brake pedal very hard
A few days ago I started to notice that to start my car I had to press the brake pedal down extremely hard. This happens on every start now regardless of how long it has been between. If I don't press hard the green light does not come on at all. Has anyone experienced this or have any suggestions?
2007 is350 btw.
Thanks
2007 is350 btw.
Thanks
#3
Intermediate
Thread Starter
#4
Super Moderator
Is the problem that the light isn't turning green when the pedal is depressed the same amount as usual, or is your issue that the brake is unusually stiff and hard to press before the car is started? If the latter, have you been driving in conditions that activate the ABS system a lot?
#5
Intermediate
Thread Starter
Is the problem that the light isn't turning green when the pedal is depressed the same amount as usual, or is your issue that the brake is unusually stiff and hard to press before the car is started? If the latter, have you been driving in conditions that activate the ABS system a lot?
No I have not slammed on my brakes in as long as I can remember.
#6
The vacuum booster for the power brakes may not be retaining vacuum when the engine is turned off, making the pedal very hard to depress. Check the vacuum booster and vacuum lines for leaks.
#7
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#9
Lexus Test Driver
iTrader: (12)
Same thing happened on my '07 IS350 a year ago during the winter. Normally, the light goes on just by pressing the brakes lightly but when it got cold, I had to press the pedal hard and down farther just for the light to come on. It ended up being a vacuum leak that went away on it's own.
#10
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iTrader: (10)
Just started getting this problem today. I had not done anything with braking system lately...this just started out of the blue. It doesn't seem to me like normal booster failure, as during normal driving the pedal does not sink to the floor. The fluid level is max, fresh OE fluid, and no leaks. The ONLY thing I did find was that the vacuum line that leads the plastic IM was not 100% pushed all the way onto the port. It was connected with the clamp there, but I was able to slide it up more.
The hose is perfect...but the connection onto the port on the IM could possibly be problematic. How can I tell if in fact there is a leak at that connection? Wish Lexus had thought of using a check-valve in that hose!
The hose is perfect...but the connection onto the port on the IM could possibly be problematic. How can I tell if in fact there is a leak at that connection? Wish Lexus had thought of using a check-valve in that hose!
#11
Driver School Candidate
Just started getting this problem today. I had not done anything with braking system lately...this just started out of the blue. It doesn't seem to me like normal booster failure, as during normal driving the pedal does not sink to the floor. The fluid level is max, fresh OE fluid, and no leaks. The ONLY thing I did find was that the vacuum line that leads the plastic IM was not 100% pushed all the way onto the port. It was connected with the clamp there, but I was able to slide it up more.
The hose is perfect...but the connection onto the port on the IM could possibly be problematic. How can I tell if in fact there is a leak at that connection? Wish Lexus had thought of using a check-valve in that hose!
The hose is perfect...but the connection onto the port on the IM could possibly be problematic. How can I tell if in fact there is a leak at that connection? Wish Lexus had thought of using a check-valve in that hose!
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01-10-22 09:29 PM