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Low brake power light, RX not starting?

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Old 01-19-18, 04:38 AM
  #91  
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Originally Posted by NotADood View Post
Lexus Master Tech here,

Lexus is aware of the issue, and a new brake booster will need to be installed. The vacuum reserve is losing vacuum overnight. The ABS/VSC computer picks up on this, and thows the code.
Can someone pls post the TSB.cant find anywhere. My 17 was built 10/2017 has 3k miles and is having this issue. Clearly Lexus has not solved this problem,
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Old 01-21-18, 01:01 PM
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With all the draw on the battery our new technology inflicts on it, it behooves us to get a smart battery charger (CTEK; GENIUS etc) and plug it every 6 months, the battery's life will be doubled if not tripled and you'll get you pay-back in $ & less inconvenience.
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Old 01-22-18, 07:54 AM
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Originally Posted by Cocal View Post
With all the draw on the battery our new technology inflicts on it, it behooves us to get a smart battery charger (CTEK; GENIUS etc) and plug it every 6 months, the battery's life will be doubled if not tripled and you'll get you pay-back in $ & less inconvenience.
And why is that? Yes I know some people do it with their motobikes and custom LiFePO4 batteries and smart charger will 'balance' cells inside the box and etc; why to do it with Lexus SUVs lead-acid battery? 50 years ago people didn't get dead lead-acid battery in less than 2 years!

Lexus on-board computer may show smarter error messages if battery power is not enough to start engine.
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Old 01-22-18, 09:33 AM
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Originally Posted by Ssteigss View Post
Can someone pls post the TSB.cant find anywhere. My 17 was built 10/2017 has 3k miles and is having this issue. Clearly Lexus has not solved this problem,
Have appointment for Friday. Service advisor said they are familiar with issue and requires brake booster replacement. Said its a redesigned part. Ill update once completed.
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Old 01-22-18, 11:20 AM
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Originally Posted by Bambarbia View Post
And why is that? Yes I know some people do it with their motobikes and custom LiFePO4 batteries and smart charger will 'balance' cells inside the box and etc; why to do it with Lexus SUVs lead-acid battery? 50 years ago people didn't get dead lead-acid battery in less than 2 years!
Lexus on-board computer may show smarter error messages if battery power is not enough to start engine.
50 yrs ago the battery only started the car & operated lights today they do a whole host of different things which put a draw on it constantly.
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Old 01-29-18, 06:35 AM
  #96  
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Originally Posted by Cocal View Post
50 yrs ago the battery only started the car & operated lights today they do a whole host of different things which put a draw on it constantly.
You can connect electric heater, TV, refrigerator, and A/C to your battery, and connect your battery to the charger (as in case with running engine's alternator), it shouldn't decrease battery life, and it shouldn't consume any electricity form the battery. As 50 years ago, electricity was used to keep engine running (by sparking gas in valves), but is was electricity coming from alternator and not from battery (although battery was "on a way").

Almost nothing changed (in terms of battery consumption & total-watts-per-year-per-battery which indeed significantly decreased!), except that today Lexus Canada (Ontario) uses modern computer chip to operate it.

Last edited by Bambarbia; 01-29-18 at 06:40 AM.
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Old 01-29-18, 08:56 AM
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Got my brake booster replaced last week but still get warning light ....
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Old 01-31-18, 11:06 AM
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I think I may have the fix for you! My 16 RX had this same problem. I was getting the "Braking Power Low" message on the instrument cluster screen. Since no codes are stored, my local dealer went to the first fix that has been mentioned here a number of times, they replaced the Brake Booster. In fact, that didn't fix it so the SECOND time, they replaced the Brake Booster and Master Cylinder assembly, per a Field Lexus tech my local dealer called on the phone. That didn't fix the problem. Finally on the third attempt, I believe they have fixed it because, knock on wood, since September I am problem free. It was coincidental that on the date of my third service appointment, the Field Lexus Tech from Chicago (same person they called on my second fix attempt) was visiting my dealer for another case. He advised the following. I cut and pasted it verbatim from the service invoice.

FIELD TECHNICAL REP HERE FROM LEXUS CHICAGO ADVISED TO ADJUST BRAKE LIGHT SWITCH STILL IN FACTORY SPEC SETTINGS SO THE BRAKE PEDAL ENGAGES THE START BUTTON FASTER WITH LESS FORCE

This fixed it for me, hopefully it will do the same for you!
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Old 01-31-18, 02:04 PM
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Originally Posted by lexitaxi View Post
I think I may have the fix for you! My 16 RX had this same problem. I was getting the "Braking Power Low" message on the instrument cluster screen. Since no codes are stored, my local dealer went to the first fix that has been mentioned here a number of times, they replaced the Brake Booster. In fact, that didn't fix it so the SECOND time, they replaced the Brake Booster and Master Cylinder assembly, per a Field Lexus tech my local dealer called on the phone. That didn't fix the problem. Finally on the third attempt, I believe they have fixed it because, knock on wood, since September I am problem free. It was coincidental that on the date of my third service appointment, the Field Lexus Tech from Chicago (same person they called on my second fix attempt) was visiting my dealer for another case. He advised the following. I cut and pasted it verbatim from the service invoice.

FIELD TECHNICAL REP HERE FROM LEXUS CHICAGO ADVISED TO ADJUST BRAKE LIGHT SWITCH STILL IN FACTORY SPEC SETTINGS SO THE BRAKE PEDAL ENGAGES THE START BUTTON FASTER WITH LESS FORCE

This fixed it for me, hopefully it will do the same for you!
Ha! So after replacing all those part$, all it needed was a brake light switch adjustment!
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Old 01-31-18, 04:16 PM
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Yep! When they explained the fix, I was hesitant with their explanation. Actually, the service manager was somewhat skeptical too. He was just going by what the field tech told him. We couldn’t conceptualize how the brake switch could be related, but it somehow was.

Last edited by lexitaxi; 01-31-18 at 04:30 PM.
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Old 02-01-18, 07:19 AM
  #101  
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I think there are two issues. First, the brake booster loses vacuum too fast. So the brake becomes stiff in short amount of time. Second, the brake switch position is on the far side. With the stiff brake, some people may not apply enough force to make the brake reach the switch position.

I am the regular driver of my RX. I noticed the stiff brake but I never had problem to start the engine nor had the warning message. But when my wife had my RX last week, she saw the warning message, and even had problem to shift.
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