I keep pressure on the pedal it will slowly go down to the carpet

Tiny
COLIN HADWIN
  • MEMBER
  • 2004 JEEP CHEROKEE
  • 2.5L
  • 4 CYL
  • TURBO
  • 4WD
  • MANUAL
  • 65,000 MILES
Hello I've just fitted new rear brakes to my jeep, bled the brakes but I have a spongy pedal, if I keep pressure on the pedal it will slowly go down to the carpet new parts include calipers disks pads can anybody help me?
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Wednesday, June 11th, 2014 AT 12:06 PM

24 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I would suspect there is air in the lines. These guides can help you fix it.

https://youtu.be/w7gUsj2us0U

and

https://youtu.be/WDxvEQrMkBg

and

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down these guides and report back.
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Wednesday, June 11th, 2014 AT 12:20 PM
Tiny
ELSUPREMO
  • MEMBER
  • 1 POST
  • 2000 JEEP CHEROKEE
We are unable to bleed the brakes after front caliper and brake shoes replacement. After bleeding all wheels engine off with seemingly improving pedal, when engine started there is no brake pedal at all. Master cylinder may have run dry during procedure. Is master cylinder bleedable? System seems to be drawing in air, can't see where or how. We've even tried to bleed the brakes with the engine running thinking the vacuum assist is the problem. Having bled brakes a number of times over the years I'm really stumped as what i'm doing wrong. 2000 Jeep Cherokee. P.S. Brake pedal travel doesn't feel right during procedure feels a small hitch during full travel about half way.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 POSTS
When replacing the front pads, did you force the fluid from the caliper piston back into the master cylender or did you bleed it out at the caliper's bleeder valve? Also, are the rear brakes properly adjusted? Finally, the glitch you feel is most likely the brake light switch.

As far as bleeding the master cylender, fill it, loosten the brake lines where they attach to it, and then allow the pedal to hit the floor. Tighten the hoses then release the brake pedal until all air is out.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
MYDOGDRIVES
  • MEMBER
  • 1 POST
  • 2000 JEEP CHEROKEE
  • 4.0L
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
Problem is pedal at top after starting pedal goes to the floor.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a guide for you of the possibilities of what the failure could be.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

It sounds like air in the system or a master cylinder that has failed.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Any recent work done?

Roy
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
RODGER CARTER
  • MEMBER
  • 1 POST
  • 2000 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 66,000 MILES
Replaced front brake pads and calibers and bled, but now it won't get a pedal.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Why did you replace the calipers?

Did you pressure bleed the system or use someone to press the pedal? A lot of times, pushing the pedal to the floor damages the seals inside the master cylinder and there will be no pressure build-up.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Roy
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
NSNEDEGAR
  • MEMBER
  • 1 POST
  • 1998 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
I was driving home earlier today and when I press down on the brake peddle I heard a loud pop and my brake peddle lost all pressure and went all the way down to the floor. I would have caused this and what can I do to fix this?
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 POSTS
If you didn't find any leaks to the brake lines, calipers, or wheel cylinders, chances are the master cylinder is bad. NOTE: Check the brake fluid in the master cylinder. If you have a leak, it will be low.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
RENEEBEEVER
  • MEMBER
  • 2 POSTS
  • 1995 JEEP CHEROKEE
  • 141,000 MILES
We changed the front brakes, rotors, calipers also master cylinder. We also, bled all 4 tires. Our brakes still goto floor. What could it be?
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
STEPHENS749
  • MECHANIC
  • 12 POSTS
Did you bench bleed the master cylinder before you installed it.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
RENEEBEEVER
  • MEMBER
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Yes my brother in law did but having same issues..
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
STEPHENS749
  • MECHANIC
  • 12 POSTS
Are you getting any air from the brakes when you bleed them? If you are you will need to bleed the system at the master cylinder. Loosen the brake line at the master and have someone to press the brake pedal down and hold it. It you have air at this point you will need to keep bleeding.
If you are not getting air anywhere in your lines and the pedal is going down you are losing pressure somewhere. Look for brake line leaks and check your rear brakes and see if the rear wheel cylinders are leaking. If they are they will need to be repalced. If you check all of this and you are still have no pedal you may have a faulty master cylinder.
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
KAPAHI_1
  • MEMBER
  • 1 POST
  • 1991 JEEP CHEROKEE
1991 Cherokee Brake peddle goes to the floor when engine is started?
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,553 POSTS
When you replaced the master did you bench bleed it? If not this is your problem. Here are two guides to help you with the problem:

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

and

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down these guides and report back.

Cheers, Ken
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Thursday, May 20th, 2021 AT 10:13 AM (Merged)
Tiny
STVHUTCH
  • MEMBER
  • 4 POSTS
The master was bench bled, and I did this sequence when bleeding the lines; right back, left back, right front and left front, getting absolutely no air from the lines. Cannot find any fluid nor vacuum leaks. Frustrating!
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Thursday, May 20th, 2021 AT 10:14 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,553 POSTS
No problem lets isolate the master from the wheels, gently use three vise grips with cardboard to protect the rubber brake hoses and close them off (gently). Next check the brake pedal if it goes to the floor you know it the master if you have good pedal the problem is at the wheels. Truck have ABS?
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Thursday, May 20th, 2021 AT 10:14 AM (Merged)
Tiny
STVHUTCH
  • MEMBER
  • 4 POSTS
Yes, it has the ABS with the ADA pump (I think that's what it is called).
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Thursday, May 20th, 2021 AT 10:14 AM (Merged)
Tiny
STVHUTCH
  • MEMBER
  • 4 POSTS
I clamped the lines off and the pedal was solid as a rock, I released the back lines first and the pedal dropped a small amount, right front a little more and left front back to the floor. Evidently either as much as I have bled them it still is not enough or I have got new bad calipers! I will post which way it ends. Thank you for the help!
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Thursday, May 20th, 2021 AT 10:14 AM (Merged)
Tiny
CODYRA
  • MEMBER
  • 1 POST
  • 1991 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 281,000 MILES
New driver side caliper and brake hose. New rear brake hose. New driver and passenger rear wheel cylinders. New master cylinder and new brake booster. New pads and shoes. While engine is off brake pedal will pump up like it should. With the engine running the pedal has no resistance and will go all the way to the floor. Putting the vehicle in gear and driving you can barely touch the brake pedal and get brakes, but even pushed all the way to the floor does not stop the vehicle like it should. Have bled the brakes with some one helping pump the pedal as I opened the bleeder valves. Bled the brakes with pressure bleeder. Even let the brake system gravity bleed for four hours, consistently checking the reservoir and filling back up as necessary. I had some brake pedal resistance after the gravity bleed. But after driving through about three tanks of gas I have no resistance again on the brake pedal. Absolutely lost. Any assistance would be greatly appreciated.
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Thursday, May 20th, 2021 AT 10:14 AM (Merged)

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