Question about 1999 GMC Jimmy

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My 1999 GMC Jimmy's ABS light comes on and off and then the car makes a humming sound. When I press the brakes the car begins to stop, but then the pedal drops to the floor and the car keeps going. I recently changed my front brakes and a rear brakeline that was leaking; However, when I check the brake oil level on the car it seems to be fine. Can the caliper or master cylinder be going out?

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  • GMC Master
  • 1,254 Answers

Make sure your your wheel speed sensors have good connections at the wheel since you just did work there. You may need to bleed the brakes again for the other problem.

Posted on Aug 10, 2017

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6 Suggested Answers

6ya6ya

6ya staff

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Posted on Jan 02, 2017

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Anonymous

  • 335 Answers

SOURCE: the brake light on the

There is a level switch in the master cylinder if the fluid level is low it will turn on the light and If you pressure or vacuum bleed the brakes you will center the proporting valve switch that warns of low brake pressure in either Front or rear.
Vacuum bleeding I have found to work the best.
Make sure the Park brake lever is all the way released. If you find this informationn helpful please leave me a favorable rating and by all means contact me if I can be of any further help.
www.aceautomotive1.com

Posted on Aug 10, 2008

Anonymous

  • 2 Answers

SOURCE: Anti-lock brakes come on just before I stop.

It might be a ALB sensor. Did you check to see if the sensor is operational? Its the cheapest place to check.

Posted on Mar 17, 2009

scott

  • 532 Answers

SOURCE: Brake problem

air in the lines,bleed them,check rear brakes

Posted on Apr 18, 2009

mikesagenius

Mike GeniuS

  • 24 Answers

SOURCE: no brake pressure

There IS one place it can still leak. behind the brake master cyl - into (inside) the power brake vaccum booster, although that doesn't seem the problem. You first need to make sure your master cyl is bench bled. with a hose bleeder kit, you can bench bleed in-car. you should be able to bleed sys through abs sys with no problem. Sounds like the master cyl needs to be re-bled.

Posted on Jun 03, 2009

co7196

Ned C Cook

  • 3433 Answers

SOURCE: bad brakes on gmc suburban,

Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

Posted on Jun 15, 2009

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no, it sounds like you need brake pads or maybe even a caliper bolt feel out.

Aug 20, 2009 | 1999 GMC Jimmy

1 Answer

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sounds like your abs isnt working right. The pulling to the right could be the alignment out, brake pads more worn out on one side then the other or a rotor grabbing better than the other. If I was you I would get the alignment checked along with replacing brake pads and rotors and maybe disconnecting the abs, thats what I did to mine and have no problems anymore.

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