2002 F150 4WD 5.4 Auto

[lil_dq]

ATTN ALL MODS, SUPERS, AND ADMINS, THIS IS IN THE CERTIFIED TECH FORUM!!!

Ok techs, I replaced the DF Caliper this afternoon, along with front pads and had the rotors turned.

I bled all the brakes until I had brand new fluid coming through the line at all four corners, starting at the PR, then DR, then PF, then DF bleeders.

Problem is I have still got a spongy brake pedal. The reason for the change was a sticking bottom caliper piston on the DF caliper.

Is there anything special I need to do to the 4WABS that I don't know about, or should I have it pressure tested at a local shop?



Thanks in advance all.

 

[blacksnapon]

ATTN ALL MODS, SUPERS, AND ADMINS, THIS IS IN THE CERTIFIED TECH FORUM!!!

Ok techs, I replaced the DF Caliper this afternoon, along with front pads and had the rotors turned.

I bled all the brakes until I had brand new fluid coming through the line at all four corners, starting at the PR, then DR, then PF, then DF bleeders.

Problem is I have still got a spongy brake pedal. The reason for the change was a sticking bottom caliper piston on the DF caliper.

Is there anything special I need to do to the 4WABS that I don't know about, or should I have it pressure tested at a local shop?



Thanks in advance all.

First thought is master cyl. Then front wheel bearings. Watch rubber brake lines for "ballooning" when pushing the brake.

 

[lil_dq]

Talked to the local dealer here, and they said I should try driving down a gravel road and make the ABS work by stomping on the brakes. Do that about 10 times and it MIGHT work out the bubble they think I have in the ABS system, otherwise I would have to bring it in for a service bleed where they manually open the ABS valves via the computer and bleed the brakes.

Everything worked fine before the caliper change.

 

[lil_dq]

Vince you were on the right path as usual. I had the service bleed done, they did pull a few bubbles out, but told me to replace the Master Cylinder soon as it was going out. So tomorrow I am going to replace it.