Quote:
Originally Posted by lefty556
So, the problem has become constant, which is super annoying.
I pulled the check valve yesterday. When I removed it, there was a vacuum inside the booster - that's after it sat in front of the office all day, so the booster is holding a vacuum, and the check valve appears to be working. Right?
What else should I look into?
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I'm running into this with my 1st gen as well. I do believe that it's still the booster that's failed regardless of it holding a vacuum. If the diaphragm has failed the vacuum will pull on the entire booster, not just the "front" side of the booster.
If you get in your 4Runner, don't turn it on yet, pump the brake a few times and hold the brake down (you don't have to kill it). While still holding the brake down, start the car: if the booster is working appropriately the brake pedal should sink down a little bit as the vacuum is drawn. If that doesn't happen, you're brake booster is not doing it's job.