Question about 1985 GMC K1500

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Brake pedal on my 1995 gmc sierra goes soft to the floor after already bleeding brakes

Bleed brakes the pedal is hard then after I start it the brake pedal goes soft

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Tech Jenkins
  • 359 Answers

SOURCE: 1999 GMC Sierra brake problem

When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.

Gravity bleeding is when you just open the valve and let gravity pull the fluid down.

Keep in mind you must "prime" the master cylinder first before installing it, did you do that?

Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.

After this procedure you gravity bleed the brakes, then go on to the pedal technique.

Posted on Sep 04, 2008

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  • 12 Answers

SOURCE: 2003 GMC Sierra Brake PROBLEMS!

Try vacum bleeding with a vacum pump from any parts store. You definitely have air somewhere and vacum bleeding usually works and you can do it by yourself.

Posted on Jul 07, 2009

  • 420 Answers

SOURCE: excessive brake pedal travel

Do you need new pads? Did you try to bleed the master cylinder? Are you sure you bled the system correctly? Excessive travel is almost always air in the lines of not enough brake fluid.

Posted on Aug 10, 2009

litoshop
  • 298 Answers

SOURCE: brake pedal goes down to far abs brakes

Hi I'm litoshop if you bled the system and get no results then your brake pump needs to be replaced now before replacing make sure your pads are installed correctly because if there not this to can cause this problem good luck. if this information has been useful please let us know thank you.

Posted on Aug 11, 2009

  • 1201 Answers

SOURCE: Brake pedal still goes to floor 2000 GMC Jimmy

It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Posted on Sep 15, 2009

Testimonial: "Hadn't thought about the O-rings on the rod thanks for the idea. Great Idea Thanks!"

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2 Answers

Soft brake pedal on 94 gmc sierra


in late model GM and Ford cars with quick take-up master cylinders, the quick take-up valve takes about 15 seconds to reseat after the brake pedal has been depressed, so you should wait at least 20 seconds before you press the pedal while bleeding. If the pedal is pumped too quickly while manually bleeding the system, you may never get the pedal to firm up. On a side note, did you check the level in the master cylinder after every 2 or 3 bleedin procedures? you could have been pumping air right back in the lines if the reservoir runs dry during the bleeding process.

Dec 16, 2013 | Cars & Trucks

1 Answer

When i press the brakes the pedal goes to the floor and i get like a air sound coming from the pedal area


it appears that the brake booster is faulty and that is the air noise . Replace the booster. The brakes going to the floor indicates air in the system bleed the brakes starting at the longest line first finishing at the shortest line.

Nov 11, 2013 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

Soft brake pedal on 1990 GMC Sierra. Replaced master cylinder, rear shoes are almost new, front pads are good.


if master replaced sounds like air still in lines rebleed the brake lines start with passenger rear than driver rear -pass front -than driver front last..before bleeding check rear brake shoes are adjusted correctly

Aug 10, 2011 | 1990 GMC Sierra

1 Answer

I am having a problem bleading my 2000 grand pris brakes. check all the brake line no leaks but when i bleed the brabe pedal coes to the floor. i have also bleeb frunt to rear and rear to frunt.


This is a two person job. You have one push the brake pedal to the floor and hold it there. Then the other opens the bleed valve until brake fluid comes out. Close the bleed valve and have the other person release the brake pedal. Repeat. Continue doing this on each brake bleed valve until there is no more air coming out of the lines at each bleed valve just a solid stream of fluid. Fill master reservoir back up with brake fluid as needed through the process. You bleed from farthest to closest meaning from rear to front.

Aug 04, 2010 | 2000 GMC Sierra

1 Answer

Brake problem spongy brake pedal pedal goes down replaced front pads and master cylinder and wheel cylinder and bleed lines


try bleeding them more,start with the right rear,then left rear,then right front ,then left front, always bleed the brake that is furthest from the master cylinder, sometimes you have to bleed them several times until you get a steady stream of brake fluid.

Jul 29, 2010 | 1995 GMC Suburban

1 Answer

How to bleed front brakes?


hello, your going to need a buddy in the truck pumping the brakes while you bleed them. With that first you need to verify that the master cylinder is full, if it is you can get started, there are two ways you can do this, the first is called a non-pressure bleed, this is when you break the bleeder loose and have your assistant push down on the brake pedal and when it is all the way to the floor you tighten the bleeder up before they release the break pedal. The second method is the pressure bleed. this one is a little bit more messy, you will have your assistant pump the brake pedal several times and hold firmly while you break the bleeder loose, the pressure will force the fluid and air out quickly. you will have to bleed both wheels untill there are no more bubbles in the fluid coming out. be sure to keep checking the master cylinder to verify that the brake fluid is full.

May 18, 2010 | 1995 GMC Sierra C1500

1 Answer

1997 GMC Sierra 5.7 changed master cylinder calipers and brake pads. I have a hard pedal until I turn the truck on and the pedal goes to the floor? Is there something I am missing? I have bled the brakes...


check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now

Dec 06, 2009 | 2003 GMC Sierra 1500

1 Answer

Hard to push brake pedal down to stop.


1. Check brake fluid level and look for leaks in the brake lines and at the calipers.
2. Bleed the brake fluid completely and replace with fresh fluid (google search: how to bleed brakes). Then bleed air by having someone press the brake pedal 4-5 times, then press and hold while you open the bleed valve and close when fluid streams out. start with the rear wheel (if 4wheel disc brakes) then move to the front.
3. Replace Master Cylinder (sorry, but if 1 or 2 didn't fix it, this is the last option) This is usually over $150, and will involve step 2 again when completed.

Good luck, hope this helps.

Sep 29, 2009 | 1996 GMC Sierra

2 Answers

Brake pedal still goes to floor 2000 GMC Jimmy


It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Sep 15, 2009 | 2000 GMC Jimmy

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