Brake pedal vibrates

So I have a 17 Off Road and not sure how many people noticed, but when you start the truck it pushes the brake pedal up some. Well does anyone know what does that and how important it is? My brake pedal has been acting up, it vibrates when you start up the truck instead of pushing the pedal up. Also vibrates during some hard brake pressure. I'm 1400 miles from home and it seems to be fine besides the vibration.

 

Mine has done the same for 15k miles now. Dealer said no issue. I think it happens too often, but time will tell. I have an extended warranty.

It's the ABS pump I believe doing some sort of self test. If you leave your ignition turned on and listen under the hood for 10-15 minutes, it'll do it on it's own at least once or twice.

 

Mine also does the same thing both at start up and when I first hit the pedal any time I'm coming to a stop. Had it at the dealer last week for some ABS and vehicle stability warning lights (with only 2800 miles on it) and brought it up as something to check out and they "couldn't replicate" the vibration. Pretty easy to replicate it in my opinion as it happens all the time but with all of the recalls it probably never really got looked at.

 

Normal, 4runners have been doing it for a decades, it's a characteristic of the ABS system the OR has.

Definitely mention it to them during the next service so it's checked out and documented.

 

Good to know, now I can focus on bothering my dealer about my howling diff

 

Edited:

I had vibrations in my brake pedal that were tied to a warped rear DRUM... just my experience but worth a look.

 

How did you end up with a Rear Brake Rotor?

 

edited

 

When I first read it i thought maybe you did some sort of Rear Disc Conversion.

 

If it's vibrating like a cell phone that's normal for the Tacoma. I eventually stopped noticing it, but it never stopped happening.

 

There's nothing to check or document, it's perfectly normal. You're just feeling the electric brake booster pump up pressure in the system.