Power brake booster/ cylinder
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From: Oregon
Power brake booster/ cylinder
To anyone with the 450h, is it normal for the power brake booster or brake cylinder sub assy to buzz every 10 seconds? It's pretty loud inside and only does It engine is off and in park but even when the car is completely shut off I still hear it for a bit. I feel like it used to be every here and there and now it's literally every 10 seconds. If it’s a problem what’s the remedy?
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To anyone with the 450h, is it normal for the power brake booster or brake cylinder sub assy to buzz every 10 seconds? It's pretty loud inside and only does It engine is off and in park but even when the car is completely shut off I still hear it for a bit. I feel like it used to be every here and there and now it's literally every 10 seconds. If it’s a problem what’s the remedy?
Last edited by bclexus; Mar 15, 2025 at 06:54 AM. Reason: orthography
Lexus Champion
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From: Texas
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Driver School Candidate
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From: Oregon
Every 10 seconds when the car is on in park no foot on brake. Even after I shut off the car it still does it but shorter intervals so it’ll buzz for say 3 seconds, then not buzz for another 15-20 seconds then do a long 5 second buzz and then stop for another minute. But I’m mostly worried about it doing it every 10 seconds when I’m just in park not doing anything.
Lexus Champion
Joined: Nov 2014
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From: Texas
Every 10 seconds when the car is on in park no foot on brake. Even after I shut off the car it still does it but shorter intervals so it’ll buzz for say 3 seconds, then not buzz for another 15-20 seconds then do a long 5 second buzz and then stop for another minute. But I’m mostly worried about it doing it every 10 seconds when I’m just in park not doing anything.
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The brake accumulator is tied in with the hybrid's regenerative braking system and communication system, linked to the car's vast Controller Area Network (CAN).
It doesn't surprise me that opening the driver's door triggers the accumulator to prepare for operating duty...
Last edited by bclexus; Mar 15, 2025 at 06:30 PM.
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How long 'after' you open the driver's door is the noise heard?
Do you hear it immediately 'upon' opening the driver's door - in other words, does opening the driver's door actually trigger it 'instantaneously' to make the noise?
If so, that's perfect! It's preparing the accumulator for imminent work duty!
Do you hear it immediately 'upon' opening the driver's door - in other words, does opening the driver's door actually trigger it 'instantaneously' to make the noise?
If so, that's perfect! It's preparing the accumulator for imminent work duty!
Last edited by bclexus; Mar 16, 2025 at 08:10 AM. Reason: orthography
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