1998 Ford F-150 4x4 Noticed today my brakes lock my rear tires up only when I need to stop quikely or when I push a little hard I'm good on brake fluid. Looked around on brake lines a little didn't see any leaks and checked after driving all day after topping the brake fluid off (it was a tab low) and still at same as when I topped it off.I just got truck two days ago and has done it just noticed when I use brake it feels hard then goes soft but doesn't go all the way to the floor. Did the owner I got it from possible not bleed the brakes and maybe need redone by starting with the front to the back(bleeding)? No rubbing or grinding as if bad pads or rotors and seems to be no pulling as if there's a caliper locking up and not releasing. Feels like my mothers car after changing her brakes and didn't get them bleed it's just not as bad and doesn't go to floor.........so try to bleed them???? Thanks in advance!!!!

 

I would venture to say bleed everything again and go from there..

 

when bleeding.. start at the caliper farest away from the brake fluid resovoir and work your way to the drivers side front.

 

A 98 with 4x4 will have 4wabs. You can bleed the brakes until you turn blue and you still wont get the air out of the abs module. After normal bleeding an electronic service bleed must be performed to purge trapped air in the hcu, then re-bleed again the normal way.

Sometimes the bleed cycle must be repeated a few times before the pedal feels right again.

The e service bleed requires the use of special computer interface, either a New Generation Star tester or WDS/IDS.

There may be other electronic tools that will work however those three are the only ones I'm familiar with.

Good luck.