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john -aka eauto
john -aka eauto, The Car Guy
Category: Lexus
Satisfied Customers: 15999
Experience:  15 years as a auto tech Ase Certified
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Have Lexus RS330 2006. Brake Light coming on all the time.

Customer Question

Have Lexus RS330 2006. Brake Light coming on all the time. Checked brake fluid and it's full. Parking brake disengaged. Thinking it's a bad sensor. What's the estimate to replace sensor if that's the problem? What else could it be? John
Submitted: 10 months ago.
Category: Lexus
Expert:  john -aka eauto replied 10 months ago.

is it brake or abs?

Customer: replied 10 months ago.
Brake light on dashboard
Expert:  john -aka eauto replied 10 months ago.

is the float in the master cylinder stuck down?

Customer: replied 10 months ago.
Don't know. Just looked at fluid level on outside
Expert:  john -aka eauto replied 10 months ago.

there is a simple float in the master cylinder that acts as the fluid level sensor if its stuck it will cause this...can you check?

Customer: replied 10 months ago.
Checked the Brake fluid reservoir, removed the strainer, and the float is moving freely. Pushed it down and it floats back to top.
Customer: replied 10 months ago.
anybody there?
Expert:  john -aka eauto replied 10 months ago.

sorry im hear now..try unplugging the sensor on the side of the master see if that shuts the light off

Customer: replied 10 months ago.
Finally I was able to check again. Detached the connector to the brake fluid reservoir and the dashboard stayed on. Left it off for a day and still the light is on.
Expert:  john -aka eauto replied 10 months ago.

and the master is 100 percent full? have you scanned for abs codes

?

Customer: replied 10 months ago.
100% full, Don't know what ABS light codes are. ABS light does not stay on, only BRAKE light.
Expert:  john -aka eauto replied 10 months ago.

its likley the level sensor has failed...is it a 2 wire plug?

Customer: replied 10 months ago.
2 wire connection
Expert:  john -aka eauto replied 10 months ago.

jump the connector if the light goes out its the switch on the master

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