Soft brakes

Tiny
BURBAGREAT
  • MEMBER
  • 2006 MERCURY MONTEREY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 230,000 MILES
My car has ABS. Replaced brake booster and master cylinder. Brake is very soft. Tried to adjust brake booster push rod but is not adjustable. Bled brakes twice and has plenty of brake fluid (no leaks detected). Brand new booster, brand new master cylinder. Also has 'squeaking' sound when depressing brake pedal. Did not have soft pedal issues before replacing booster and master cylinder. Any help is appreciated. Plenty of fluid, no leak detected.
Thursday, May 23rd, 2019 AT 8:14 PM

3 Replies

Tiny
MOTOR MASTER
  • MECHANIC
  • 279 POSTS
Hello my name is Dave.

My first question is if you "bench bled" the master cylinder? Here is a link to our tutorial on installing a master cylinder: https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
I believe the tutorial will help you get the pedal back to normal.
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Friday, May 24th, 2019 AT 4:28 AM
Tiny
BURBAGREAT
  • MEMBER
  • 2 POSTS
Our mechanic (friend of the family) told me that he did bench bleed the master cylinder.
He did all the work as I was in another state at the time.
Could there be another cause for the soft pedal? Is the push rod non-adjustable because of having ABS? I'm relocating about 960 miles away and need to drive this vehicle. Just want to make sure this vehicle is safe for the journey. Thanks so much
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Friday, May 24th, 2019 AT 9:28 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,480 POSTS
On these you must use a scan tool to open the ABS valve when bleeding to get the air out. I shop will charge about $130.00. Please let us know what happens.
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Sunday, May 26th, 2019 AT 2:24 PM

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