Brake pedal is spongy (all the way down when engine is running)?

ELIESER PEñA REYES

MEMBER
2008 MERCURY MARINER
2.3L
4 CYL
2WD
AUTOMATIC
160,000 MILES

I replaced the calipers and bled the brakes, the car brakes well when I press the pedal two times. But if I wait a few seconds, the pedal goes all the way down. With the car running.
The ABS pump was working fine before replacing the calipers.

5 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

This vehicle does require a scan tool to properly bleed the ABS.
The scanner allows you to open the ABS valves and have a proper bleeding process.

Here is a helpful guide:

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

I have attached the procedure below for your reference.

Let me know if you have any questions.
Thank you.

Images (Click to make bigger)

SPONSORED LINKS

Was this

answer

helpful?

Yes

Sunday, October 30th, 2022 AT 9:20 PM

ELIESER PEñA REYES

MEMBER
3 POSTS

We already use the scanner to run an OBDII controlled bleeding process. I've already did it two times, and it's still not working properly.
Is it possible that the HCU is damaged? Somehow the pressure releasing valve went all the way always open?

Was this

answer

helpful?

Yes

Sunday, October 30th, 2022 AT 9:38 PM

SQM

MECHANIC
6,383 POSTS

Are you getting any ABS error codes? Typically is the module is bad it will throw code.

Was this

answer

helpful?

Yes

Tuesday, November 1st, 2022 AT 10:25 PM

ELIESER PEñA REYES

MEMBER
3 POSTS

No error codes. Looks like the HCU. Replaced the ABS HCU and is working fine now.

Was this

answer

helpful?

Yes

Wednesday, November 2nd, 2022 AT 4:30 AM

SQM

MECHANIC
6,383 POSTS

So, you were able to fix it. That is great news.
Thank you for updating us.

Brake pedal is spongy (all the way down when engine is running)?

5 Replies

Please login or register to post a reply.

Sponsored links