Question about 1998 GMC Jimmy

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Brake problem 1999 GMC jimmy SLS i have a problem with my Brakes, the ABS light is on and i have checked all the oil side right to the calipers so all is good, but if i push on the brake pedal its slowly creeps and drops to the floor, the brakes work but i guess at 10% effective. Is the an electric pump to boost the master cylinder pressure up?

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  • subceng Apr 18, 2009

    Hey thanks. but i think i have a slightly bigger problem, without the engine running the pedal is hard and does not creep. as soon as the engine starts and i push on the brake pedal it creeps slowly and then goes to the floor quickly.
    My second problem is the brakes do not seem to have enough pressure to make the vehicle stop. I have to press as hard as possible to get it to slowly come to a stop.
    do you know if these jimmy have an electric pump to boost the brake pressure?


  • subceng Apr 22, 2009

    Here is what i have done so far.
    i have bleed all 4 wheels with the engine running and stopped. definitely no air in the lines,
    if i press the brake with the engine stopped, the pedal does not move.
    with the engine running the pedal starts to creep slowly, then after about 1 inch of travel, it drops to just near the floor.
    i have jacked the truck up and ran the engine and in gear, if i press the pedal till its tries to creep i have no brake on the left rear, (the right rear stops) when the pedal creeps, the wheel can be stopped, but not before a great deal of pressure on the pedal.
    the booster holds a vacuum and the engine pulls 17 inches of vacuum.


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Air in the lines,bleed them,check rear brakes

Posted on Apr 18, 2009

  • scott Apr 21, 2009

    no,i dont think so.Have you checked your rear brakes anyways?When a wheel cylnder blows it will leak only a little bit enough to prevent pressure.Your brake system depends on the rear.Try using vise grips to pinch off the rubber line in the rear (dont tighten too tight or you could damage the rubber hose,just enough to close the line)and then pump your brakes,If it is full of fluid and you still dont have brakes,then a front caliper on either side could have air in it or is leaking fluid.By the way,i have a 2003 chevy s10 Blazer myself.Good luck

  • scott Apr 22, 2009

    ok,first thing,ive experienced in the past that bleeding the brakes with the engine running is harder on the master cylnder.I usually gravity bleed the brakes,because i work on vehicles alone.So the wheel cylnder and brakes are ok on the left side?-BUT still doesnt work?Thats good actually,that means the proportion valve is good,the master cylnder is working,so all is left is to focus on that side.So what could it be?All thats there on that side is :wheel cylnder--Brake shoes and drum..Was the adjuster all the way extended?..I understand that you have bled all the brakes,are you positive all of the air is out?Remember that both rear brakes share 1 line,so if 1 side doesnt pump up then the other side will lose the pressure it needs to stop.Try gravity bleeding it,crack it loose and walk away for 5 minutes just to double check.Ive thought about it and shared all i know,i wish i could help more,of course its easier when its right in front of me...hope this helps

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