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Brake pedal goes to the floor, I replaced all new shoes

Tiny
ANDREW WILSON
  • MEMBER
  • 2004 CHRYSLER PT CRUISER
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 163,000 MILES
I replaced all new shoes, drums and hardware in rear drum brakes. Also replaced calipers and rotors and pads on the front. I adjusted the rear drums. Bled the brakes and the pedal goes almost to the floor before it begins to brake and the master cylinder is full of fluid.
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Friday, August 28th, 2020 AT 6:47 PM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
When you replaced these components, did you replace the wheel cylinders or calipers or just the brake components you stated? If you didn't, did you open the brake lines in other ways when doing these repairs? 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.

We also need to know how you were bleeding the brakes. If this was not an issue before hand and you did not break the lines open then the only time air could have gotten into the lines is during the bleeding. the other possible cause is a failed master cylinder but again, if this was not an issue prior then we are back to how air got into the lines. Let me know and we can go from there. Thanks
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Friday, August 28th, 2020 AT 7:26 PM
Tiny
ANDREW WILSON
  • MEMBER
  • 2 POSTS
I replaced wheel cylinders in the rear shoes and drums both side. On the front I replaced rotors caliper and pads I bled the brakes with a buddy pumping and holding brake pedal down while I opened up the zerk on the caliper. Before all the replacements my brake pedal was fine. It still stops the car but goes almost to the floor. Now I have noticed that when I was bleeding them the front right side only dropped fluid out when all the rest the fluid shot out.
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Saturday, August 29th, 2020 AT 10:04 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. That is great info. I was going to suggest that you most likely still have air in one of the legs of the system. Normally when you can stop the vehicle but the pedal drops is an indication of this. So if you didn't get much fluid out of the right front, I would keep bleeding that one until you get the same amount of fluid. It should be coming out with a steady stream with some good force. Sounds like the others are correct but this one needs more work.

Let me know if you have other questions about this. Thanks.
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Saturday, August 29th, 2020 AT 5:06 PM

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Brake Pedal Goes to the Floor
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