Brakes go to floor

RETY2K

MEMBER
2003 CHEVROLET SILVERADO
5.3L
V8
4WD
AUTOMATIC
146,000 MILES

I put new calipers and lining on rear bleed lines but pedal went to floor
I see no leaks fluid full but no pedal. It stops truck but seems soft pedal.

Friday, June 3rd, 2022 AT 5:23 PM

7 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

Did you use the ABS brake bleeding when you performed the bleeding?
These ABS systems require different procedures in order to bleed properly and have the proper brake pedal pressure.

Here is a helpful video on ABS brake bleeding:

https://youtu.be/nQRnKyVyMuQ

I have attached the procedure below.

Let me know of any questions.

Thank you.

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Friday, June 3rd, 2022 AT 7:43 PM

RETY2K

MEMBER
4 POSTS

Had the ABS bled, but the pedal went to the floor. No leaks. What the next move?

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Monday, June 6th, 2022 AT 10:17 AM

SQM

MECHANIC
6,383 POSTS

If you bled the ABS system with the scan tool but still getting soft pedal, then master cylinder or the ABS module could be the culprit.
Did you have soft pedal before replacing the caliper and lines?

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Monday, June 6th, 2022 AT 11:49 PM

RETY2K

MEMBER
4 POSTS

No, discovered caliper bad when changing rear brake pads. Put new calipers rear brake pads
Blead all 4 wheels pedal went to floor. I put a new master cylinder on today but still pedal goes to floor after bleeding all 4 wheels. I am thinking of replacing the brake booster tomorrow.
Any ideas what’s wrong?

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Tuesday, June 7th, 2022 AT 6:25 PM

SQM

MECHANIC
6,383 POSTS

The only other component that is left would be the Hydraulic module. But it does not explain why this would happen after the replacement of the components. You are not losing any fluid are you?