Brake pedal goes to floor but works if pumped

ANGELA RICHARDS- JOHNSON

MEMBER
2005 DODGE CARAVAN
3.8L
V6
2WD
AUTOMATIC
160,000 MILES

Hi, our van has been to multiple mechanics. We had good brakes but our ABS was not working. Our mechanic put in a new ABS module now the ABS is working, but the brakes are horrible unless I pump them. We have changed the calipers, master brake cylinder twice because we thought the first one might be faulty. All rotors and pads have been replaced, bled out the system by three different mechanics and the brake lines have all been tested for leaks by a certified mechanic and no leaks. We do not know what to do now, any suggestions?

Thanks,
Angela

3 Replies

AL514

MECHANIC
4,669 POSTS

The ABS module has to be bleed using a scan tool that can command the solenoids open. There is still air in the system, pumping up the pedal is just building pressure temporarily. Common issue when the ABS mod. Is replaced. They need to be bled correctly.

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Sunday, February 21st, 2021 AT 11:08 AM

ANGELA RICHARDS- JOHNSON

MEMBER
2 POSTS

The dealership said that they did that, they bled the ABS system and said they activated the ABS module and that it must be the master brake cylinder causing the problem. After replacing it again we had the same result.

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Sunday, February 21st, 2021 AT 11:08 AM

AL514

MECHANIC
4,669 POSTS

Then they diagnosed the problem wrong. After replacing the master you will have to re-bleed the ABS system again or you will still have air in the lines. They should have been able to repair this problem for you from the start. They are the most qualified techs for this vehicle. There should be no reason they are not directing you in the right direction. They are supposed to be the expert's.

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Sunday, February 21st, 2021 AT 11:08 AM