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Old 04-23-2014, 03:03 PM #1
MtnLlama MtnLlama is offline
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Brake Booster?

Hi guys. So i've been having issues with the brakes on my 99 limited 4runner and I think I have determined that the brake booster is bad, however i'm not fully convinced yet. I have the rock hard pedal issue, which I though was related to the cold weather up here in Duluth, however after i replaced the check valve/grommet I'm still getting the same issue. It isn't as prevalent when braking on flat ground, however as I'm braking down some of the steep hills around the city the pedal will progressively get harder to the point where it's rock solid and the brakes are not fully functioning.

Also, i can slightly hear air escaping right when I start it and depress the brake pedal. This seems to go away as it warms up, however. The strange thing is that when i pump the brake pedal with the key off it builds pressure and gets hard and then when i start it it slightly depresses...isn't this a sign of a properly working booster? I'm just trying to do some research before I throw money at it. Also, is the 99 booster and different from previous years? The local salvage yard has a few older booster in stock.

Thanks for the input.
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Old 04-24-2014, 11:33 AM #2
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Mine went bad and sounds very similar. It would even work intermittently until it was all gone. It is a very simple procedure, however please buy OME or you will need to replace it again in a couple years, which I had to do. I also, have a 99 and changed it in the parking lot of an ACE hardware 200 miles from a actual town. (Hence having to buy a Napa type knock off)
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Old 04-24-2014, 01:59 PM #3
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Oh man Duluth... I actually got trapped there for 2 months once, hate that place, even with most of my family still living there. But if you can make a living and don't mind the temps, power to you!
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Old 04-24-2014, 02:03 PM #4
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Originally Posted by thor999 View Post
Oh man Duluth... I actually got trapped there for 2 months once, hate that place, even with most of my family still living there. But if you can make a living and don't mind the temps, power to you!
Ha! You must have been trapped in the winter. The summers are gorgeous and as long as you live an active lifestyle it's not all that bad! I'd much rather be in CO though....

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Originally Posted by ajonesnv View Post
Mine went bad and sounds very similar. It would even work intermittently until it was all gone. It is a very simple procedure, however please buy OME or you will need to replace it again in a couple years, which I had to do. I also, have a 99 and changed it in the parking lot of an ACE hardware 200 miles from a actual town. (Hence having to buy a Napa type knock off)
Good to know it's an easy procedure. Do you know if any 3rd gen booster is compatible with a 99? I'll probably go the salvage yard route due to the price of a new OEM one
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Old 04-24-2014, 02:10 PM #5
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96-2000 are the years you want to look for.

Car-Part.com--Used Auto Parts Market for a yard close by.
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Old 04-24-2014, 02:30 PM #6
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96-2000 are the years you want to look for.

Car-Part.com--Used Auto Parts Market for a yard close by.
Sweet! Thanks for the quick reply
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Old 05-08-2014, 05:02 PM #7
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I have a 1999 with 231,000 and I have the same problem. I took it to the dealership and they confirmed it. In the past I have had a 1997 and a 1998 4Runner and the brake boosters all appear to be the same, if that helps.
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Old 05-08-2014, 07:13 PM #8
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Quote:
Originally Posted by SgtAbn View Post
I have a 1999 with 231,000 and I have the same problem. I took it to the dealership and they confirmed it. In the past I have had a 1997 and a 1998 4Runner and the brake boosters all appear to be the same, if that helps.
Good to know. I just picked one up from the junkyard today, so hopefully it'll solve the issue!
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Old 07-18-2014, 03:09 AM #9
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Did it solve your issue?
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Old 10-16-2014, 09:12 PM #10
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Did it solve your issue?
Would also like to know if it solved the issue. Facing the same problem, unfortunately.
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Old 10-16-2014, 09:59 PM #11
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Yep bad booster. Pretty common issue. I just fixed it on my runner. Brakes got rock hard the more you pressured on them and would not stop the truck very well. Dead give away is hold the brakes down and turn off the truck the pedal will go up some.
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