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Old 10-17-2008, 06:47 PM
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99 chevy hydroboost problems

Hey.. Got some problems w 99 suburban hydroboost? Was working perfectly till brake pad wore down on right side.. and caused steering booster to overcompensate for pull? Now have strange overboosting when turning sharply? Brake booster starts kicking in and almost brings truck to a stop? Must be something wrong w a valve controling pressure at the booster? Or maybe the main valve in the steering box has failed? REALLY pissed.. Maybe the hydroboost needs to be rebuilt? Any help would be greatly appre... thanx .. Would like to nail it w/out going on wild goose chase???.. DAN

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Old 11-20-2009, 06:59 PM
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Hi dhspyder— Is it possible that the pedal rod pressure to the hydroboost has been riding the brakes, which would not only cause the pad to wear but cause damage to the hydroboost!

The rod to the hydroboost must not apply any pressure to the hydroboost unit at all, except when actually pressing with your foot. Check to see if that's the case. If there isn't any free play, you may have a damaged hydroboost.

I'm aware of this scenario because the only thing keeping the rod from engaging the hydroboost on my '57 1-ton chevy truck is an old thick spring. On my rig, it's not like there's any "play" to quantify— it's either not touching the hydroboost or…

I've just installed this unit myself, so I don't have actual experience with the problem you have described.
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