2002 Toyota Tacoma 2.4L manual tansmission

Hi, I recently installed a new brake booster into my truck due to having excess travel in the brakes and when hitting the brakes the truck would begin to have a rough idle. This is before and after replacing the new booster. I checked for vacuum leaks and brakes leaks and yet there is none what so ever. Any advice?

 

I think you can rule out the booster by disconnecting the vacuum line to the booster and plugging it. Start up your truck, hit the brakes, and see if it still idles rough. If it still idles rough id suspect a vacuum leak. Or just run through this test to make sure the booster isn't allowing air to bypass the seal