Brake pressure

MICHAEL MCCALL

MEMBER
2000 FORD F-150
5.4L
V8
4WD
AUTOMATIC
167,000 MILES

I get brake pressure when the truck is off as soon as I turn it on it goes straight to the floor. I already changed the master cylinder.

Tuesday, July 26th, 2016 AT 7:46 PM

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,836 POSTS

You need a scanner that can work the ABS valves open when the system is being bled. Can I ask if you had any kind of work done or did this just happen?

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Wednesday, March 10th, 2021 AT 11:13 AM

CHRISTOPHER NULL

MEMBER
11 POSTS

I blew a brake line on a test drive. I replaced the bad line and that is where I am at now.

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Wednesday, March 10th, 2021 AT 11:13 AM

CHRISTOPHER NULL

MEMBER
11 POSTS

I also heard of the auto bleed sequence from the scan tool also.

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Wednesday, March 10th, 2021 AT 11:13 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

If you have a scan tool, go to the ABS portion of the menu and then look for bleeding procedure. This procedure will not run if you have any active codes. Make sure the ABS light is not on. If it is, clear the code and then perform the procedure. You may have to do it several times to get all the air out of the unit.

Roy

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Wednesday, March 10th, 2021 AT 11:13 AM

CHRISTOPHER NULL

MEMBER
11 POSTS

My best friend just dropped his off tonight. So tomorrow, as soon as I get home, I will be trying it out. I have heard if you can get the wheels to slide it will do the same thing. Is that hard on the unit? Neither my brake light or ABS light is on in the cluster.