Question about 1998 Chevrolet S-10 Pickup

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I have a 1998 chevy s10 it has a good brake pedal with the engine off but with it running the pedal go'es to the floor and you can hear air at brake booster

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  • Chevrolet Master
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Will have a hard petal with veh off because no vacuum going to brake booster check line going to booster for cracks or damage if no damage check master area for leaks the air noise is booster trying to make vacuum diaphragm in booster may bad

Posted on Sep 29, 2009

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  • Master
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Check for fluid leaks and your brakes. If you see no leaks and your brakes are in good shape replace the brake master cylinder and bleed the system. The air you hear is because the pedal went to the floor. If the booster goes bad the pedal will get so hard you can hardly push it at all. I think you will find if this happened suddenly either you have a major leak or the master cylinder went bad.

Posted on Sep 29, 2009

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1 Answer

Soft brake pedal


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If you hear air, it is probably a failed diaphram in your booster. When you say you had good pedal, that was with engine off, right. Then, with engine on it goes to the floor. Does it still go to the floor with engine off? If no, it is the booster. Let me know if this isn't it or you have more questions.

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Ok the BRAKE BOOSTER is ONLY there to give you pwer assisted, otherwise NO POWER BRAKES. ( not anything to do with the low brake pedal ) Hopefully the junkyard master cylinder was in better shape than your original. AS far a bleedinda system, heres what I do. First with a1998 vehicle, I would go to ALL 4 wheels , OPEN & CLOSE slightly each bleeder to insure none of them are FROZEN, and they do freeze shut ENSUE THE MASTER CYLINDER IS FULL and CLOSED Now with an assistant sitting in the drivers seat, ready to pump the brakes, and ABLE TO HEAR YOU. Go to the furthest wheel from the master which would be the R/R. DONT touch anything yet. Tell the asst too slowly pump the brake pedal till it gets hard, and then HOLD THE PEDAL DOWN ( and dont let up on it until the pedal drops. If the ast lets up before the bleeder is closed you **** in air.Repeat at each wheel til the pedal stays hard. Hope this helps

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