Is this normal? stock ’25 Gladiator Rubicon brief buzz when braking.

[gonemad]

6,200 miles.

The noise is a very uniform electronic buzz from outside the cabin. The buzz is a specific duration (1.5 seconds maybe) that doesn’t change. It is only noticeable when in a drive through with a wall that the sound reflects off of. Not loud, but very distinct with the window down and I’m creeping up in the line of vehicles, braking intermittently. It can sometimes happen right as I depress the brake pedal, but always the same, short length of buzz. Or sometimes when I release the brake. The buzz is always the same. It is not the pads or rotors. Sounds like some kind of eletronic actuator.

Any ideas?

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[DiehardTory]

25 Model, should be under warranty.. back to the dealership and recommend having the ser mgr road test w/you onboard to clearly demonstrate what is happening. If I were to guess possibly a metal brake line rubbing and when pressurized creates the noise OR some sensor or servo on the ABS system.

 

[gonemad]

I just did something I should have done before. I can crank the vehicle in the driveway, roll down the window, lean my head out, and depress the brake while still in park, and reproduce the buzz. Although if I release and depress the brake again it might not do it. But if I wait a few seconds, and depress the brake again it will reproduce the buzz.

I will get my wife to help me do that myself once the 35 degree wind isn’t blowing 40 mph in my driveway. Maybe with the hood up with her in the vehicle depressing the brake I can track down the location of the buzz. I'll report back here.

I’d rather have a better idea what’s going on before taking it to the dealer and have them tell me the vehicle is operating as normal.

 

[gonemad]

So, the buzz *appears* to be coming from under the alternator (edit). There several connections at that module one of which appears to be a vacuum line that runs from the module on top of the oil filter, over to the brake master cylinder.

Beyond that, I am way above my pay grade. At least I will be able to reproduce the buzzing noise, and its general proximity, and point it out to the service writer, and/or tech, whoever I talk to first at the dealership.

 

[Bandit’s Lair]

Do you have a Tazer on your Jeep? And do you get any lights on the dash when it happens? ABS light or anything.

 

[gonemad]

Do you have a Tazer on your Jeep? And do you get any lights on the dash when it happens? ABS light or anything.

No Tazer, no warning lights, and no codes when I plugged in the OBDII scanner. The Jeep is bone stock.

 

[gonemad]

I’ve identified where the buzz is coming from when applying the brakes. It’s the brake booster vacuum pump located directly beneath the top mounted alternator. Part # 04581991AB.

Now that I have ID’ed what’s causing the buzzing, a brief web search tells me that this is not an uncommon issue. I’m about 4000 miles from my next routine service and might wait. It’s about a $260 part, otherwise I’d just change it myself, but I’m under warranty.

Edit to add- Evidently they all buzz, but when they are new they buzz quietly, but sometimes they can get louder. I guess the question is, does that mean part failure is next. Unknown. My Glad only has 6200 miles on it.

Edit to the edit- The OE part is about $250 street price. Aftermarket is $60 on ebay.

The dealer does not keep it in stock, which means a forty mile round trip and an appointment for them to diagnose and approve the warranty repair, then they order the part, and I have to go back a week later and have them install it. So, 80 miles and two trips there for a warranty repair, or $60 aftermarket and install it myself.

 

[Janster]

I’ve identified where the buzz is coming from when applying the brakes. It’s the brake booster vacuum pump located directly beneath the top mounted alternator. Part # 04581991AB.

Now that I have ID’ed what’s causing the buzzing, a brief web search tells me that this is not an uncommon issue. I’m about 4000 miles from my next routine service and might wait. It’s about a $260 part, otherwise I’d just change it myself, but I’m under warranty.

Edit to add- Evidently they all buzz, but when they are new they buzz quietly, but sometimes they can get louder. I guess the question is, does that mean part failure is next. Unknown. My Glad only has 6200 miles on it.

Edit to the edit- The OE part is about $250 street price. Aftermarket is $60 on ebay.

The dealer does not keep it in stock, which means a forty mile round trip and an appointment for them to diagnose and approve the warranty repair, then they order the part, and I have to go back a week later and have them install it. So, 80 miles and two trips there for a warranty repair, or $60 aftermarket and install it myself.

I would highly recommend you take it to the dealer to have them deal with it.

If you install it yourself and it ends up being a ‘bigger’ problem (other braking issues that you’re not aware of)….. OR…. The problem comes back later… The dealership might not cover it (And especially if you use non-OEM parts).
Just sayin…..

 

[gonemad]

I think my plan is to roll with it as is till my next routine service. It works, and I don’t hear it unless I’m in a drive-thru. If they elect to replace it then I’ll make the extra trip back since they don’t stock the part.

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