Funny little noise and vibration down by the brake peddle at start up

It's like a little "brrrrrrrp" noise I hear and feel at start up, doesn't happen again driving. Only happens at star up. I have to admit I'm proud of myself for not wigging out over it like I usualy do, obsessive compulsive ( boy do I wish I wasn't. As always thank you in advance guys.

 

do you press the brake pedal when you start it up? probably the brake booster pressurizing

 

No I don't that I know of, I'll be more attentive next time. Nice AR

 

thanks.

on the newer tacomas (2012-2015 i believe) the brake booster isnt a vacuum booster like older vehicles. its an electronic brake booster i believe. they act a little differently than a vacuum booster does

 

Well that's sounds like what it is Dan, as it is a 2015. I can't express enough gratitude for you taking the time to reply, I just want to enjoy my new truck and not worry about problems. I have a Whindham I bought 3 years ago and made it tactical cool

 

The ABS modulator is priming. This is normal.

/thread

 

Victory, as with Dan, THANK YOU. that brrrrp or vrrrp noise just had me concerned. Thank you

 

no worries man. if somebody else believes its something else, please chime in.

i sold my DPMS about 2 years ago for my windham. best decision ive made in a while. its an absolute dream to shoot and the aimpoint i have on it is just amazing. i didnt go all "tacticool" on mine though lol. everything thats on it is there for a reason. the spikes dynacomp compensator i have is great at keeping the gun pretty much recoil-less

 

Dan when I decided to buy one, for once or maybe twice in my life I slowed down and did my research. First thing I liked and honestly the biggest reason I went with Whindham was the whole CEOS hiring back all the old employees, if only a majority of bosses gave that much concern about their employees. Then I put on some A.R.M.S flip up sights ( made in Mass) and a hand gaurs ( made in Mass) and a Magpul grip and trigger guard),

 

if you have an 09+ TRD OR 4x4 you have the electric boosted master cylinder / abs / traction control unit all in one. The sound you hear is the electric pump building pressure in the accumulator.

ONLY the 09+ TRD OR 4x4's have this.... ALL other 2nd gens regardless of year have the vacuum boosted master with separate abs / traction control unit.

 

Regarding Detective_Dans comments. See the following:

http://www.toyota-global.com/innova..._technology/technology_file/active/brake.html

There's been discussion of this on the 4 Runner forum -> t4r.org.