[nickleahy23]

We have a 1991 g3500 bus here at school that we use as a shuttle. It has hydroboost brakes on it. Having an issue with them as of lately. When you come to a stop sign and you press the brake pedal, they are super weak and go almost to the floor. But if I quick pump the pedal once, then the pedal is solid and it stops great.

I know there is no booster for it, so what could be the problem? Like I said after a quick pump, its solid and stops great...

Thanks a bunch

 

[GCncsuHD]

Sounds like air in the brake lines or a bad seal in the MC. It shouldn't be an issue with the hydroboost system, any leaks, low fluid, etc in that would cause a very stiff pedal.

 

[nickleahy23]

Sounds like air in the brake lines or a bad seal in the MC. It shouldn't be an issue with the hydroboost system, any leaks, low fluid, etc in that would cause a very stiff pedal.

there havent been any leaks, no low fluid etc...one day they just went from working great to having to pump once to work normal...on the first push i can go all the way to the floor and it barely stops, but once i let off and push it again it stops instantly..

 

[nickleahy23]

bump