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After replacing the brakes the brake pedal goes to the floor

Tiny
BIGED2021
  • MEMBER
  • 2005 DODGE DAKOTA
  • 3.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 129,527 MILES
New master cylinder
New brake booster
New brake calipers
New brake lines (copper lines)

It was brought to us with the lines and calipers already changed.
We changed the booster and the master cylinder.

Bled all the brakes bleed the master cylinder and when we start the truck and push the brake it goes to the floor.

What do we need to do?
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Friday, July 9th, 2021 AT 11:23 PM

14 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Did you do the automated ABS brake bleeding procedure? This has to be done. You may have air trapped in the ABS unit.

I posted the procedure below for you to try.

https://youtu.be/nQRnKyVyMuQ

Try this procedure and let me know if it helps. If not then we have to look somewhere else for the reason.

Roy

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Saturday, July 10th, 2021 AT 2:01 AM
Tiny
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I cannot hook a scan tool to this truck.

2 reasons why.

1) I don't have the scan tool.

2) The trucks wires that go to the hook up spot for a scan tool has been cut. It wont work. I cant hook a scan tool to it even if I had one.
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Saturday, July 10th, 2021 AT 5:27 AM
Tiny
ASEMASTER6371
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There is no other way to bleed the ABS at all.

You may want to consider removing the ABS unit completely in order to get the pedal back.

Roy
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Saturday, July 10th, 2021 AT 5:32 AM
Tiny
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How do I completely remove it?
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Saturday, July 10th, 2021 AT 7:27 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, I attached the procedure for removing it.

You will have to connect the lines from the master to the lines to the wheels. One portion of the master goes to the left front and right rear. The other line goes to the right front and left rear.

I would seriously look at having the harness repaired for the ALDL connector and having someone with a scan tool do the bleeding for you. I attached the diagram of the connector with the wire colors for you to repair.

Roy
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Saturday, July 10th, 2021 AT 7:56 AM
Tiny
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Did all that and still goes to the floor.
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Monday, July 12th, 2021 AT 6:30 AM
Tiny
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Did all what? Please explain what you did in detail for me.

Roy
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Monday, July 12th, 2021 AT 6:31 AM
Tiny
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I did exactly what you said except, it only had 2 lines one coming out of the master cylinder to the ABS and the other was from the ABS to the back brakes.
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Monday, July 12th, 2021 AT 11:48 AM
Tiny
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These lines one comes down to a block from a master cylinder to the front wheels.
The other line comes down to a block and then goes to the back wheels.
It's got drum brakes on the back.
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Monday, July 12th, 2021 AT 11:52 AM
Tiny
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You would need to put them together. Then you need to bleed the system of all air.

Did you try this?

Roy
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Monday, July 12th, 2021 AT 1:05 PM
Tiny
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Yes.
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Monday, July 12th, 2021 AT 1:12 PM
Tiny
ASEMASTER6371
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Okay, use vice grips and clamp off the brake hoses on all the wheels and see if you have a pedal.

If you do, it is something at the wheels. Release one pair of vice grips at a time until you lose the pedal.

If it does not, it is the master cylinder.
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Monday, July 12th, 2021 AT 1:20 PM
Tiny
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Just wanted to let you know that helped me solve the problem. So thank you very much for taking the time to help me out.
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Tuesday, July 13th, 2021 AT 11:57 AM
Tiny
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You are welcome.

Always glad to help.

Roy
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Tuesday, July 13th, 2021 AT 2:01 PM

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