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Posted on Jan 18, 2018
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I have a 1990 GMC Suburban 2500 that has a soft brake pedal which just started happening yesterday. It will stop; however brake pedal goes all the way to the floor. Have added brake fluid with no change. Have not seen any exterior problems like broken lines, etc. Any help would be appreciated. Thanks

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jmills187

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  • Posted on Jan 19, 2018
jmills187
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You may have a huge air pocket in the lines and hydraulics don't press well

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  • Chevrolet Master 3,944 Answers
  • Posted on Jan 18, 2018
Simon Atkinson
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Because it is the brakes AND it came on suddenly. GET THE WHOLE SYSTEM CHECKED NOW! Have you checked the condition of the brake pads? Heavily worn pads can affect how far the pedal travels before the brakes bite. Is the pedal spongy? There may also be an air bubble in the system so get a good mechanic to check and bleed the brake lines. If these are OK your looking at getting master cylinders and brake servos checked or replaced.

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5 Related Answers

Anonymous

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SOURCE: 1994 GMC Suburban front hub / bearing removal

Knock the wheel studs through the assy.

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Rob Bridges

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  • Posted on Feb 13, 2009

SOURCE: 96 gmc suburban 2500 blowing white smoke, bad gas mileage

white smoke indicates a blown head gasket check for milky looking oil on the dipstick

dennymulford

Dennis Mulford

  • 1055 Answers
  • Posted on Mar 15, 2009

SOURCE: brake pedal goes soft when engin is running on 1998 chevy 1500

pull your rear drums and inspect the shoes,you may have too addjust them out by hand too get the peddle you want

Curt Downs

  • 1779 Answers
  • Posted on Apr 12, 2009

SOURCE: 1998 chevy s10- brake pedal goes to the floor-

Did you put fresh fluid in the master cylinder? I really think you still have air in the lines. To bleed manually, start with the bleeder the greatest distance from the master cylinder, car running, helper pushing down about half way on brake pedal and releasing 3 times, on 3rd time, holding pedal down to half way depressed point while you open the bleeder valve. Repeat until you are sure all air has been flushed out. Check master cyl reservoir level often, because if it gets low and you **** air into the system, you have to start all over again. Go to wheel next greatest distance from master cyl, repeat above, working your way to wheel closest to master cyl last.

Anonymous

  • 490 Answers
  • Posted on Apr 22, 2009

SOURCE: need to know how to adjust rear brakes on 1990 gmc pickup

what year is the truck and does is have drum brakes or disk brakes in the rear if it is drum you can go thru the backing plate with a brake adjustment tool and adjust them until you feel drag against the drum when you spin the tire by hand

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