1999 F150 5.4 L Triton Extended cab

I have replaced the rotors, calibers, master cylinder, flushed brake fluid and replaced. I still get a pulsating pedal travel when applying the brakes. The pedal does't move much but just enough to go past normal stopping point when applying the brakes as traveling forward. When I go reverse and apply the brakes, the pedal stops normally or where is should with no further travel!

Comments!!!

 

Inspect soft lines? Worn rubber brake lines can contribute to these symptoms..

 

My mechanic found no leaks but I am not sure that the soft lines were thoroughly inspected. The mechanic did mention that the ABS sensors are likely building and releasing air. Quite honestly I have very little idea what I am talking about. The wheelbearings were mentioned as well?

 

Rubber lines can collapse internally. Sounds more like you need a new mechanic.

 

ABS sensors don't "build and release air". They electronically moniter the gaps in the exciter ring on the hub and send that info to the abs module via two wires. If your brake mechanic doesn't know that you should get a new mechanic.

 

check the flex lines again/ bleed the air yourself

 

99 huh?? rear drums or discs??? if its rear drums they could be out of adjustment.

 

Larry227 is correct, your mechanic is just that, a mechanic. My question to you is, does your vehicle have ABS? And if so, what is a mechanic doing working on them. With the ABS unit a rotunda is needed to bleed the system or you will get the exact symptoms your talking about. There is also another issue, with my f-350, i usually take it to ford for the brake fluid flush every other year because of contamination. If your mechanic did your brake job before he flushed it, they may have pushed debris into the abs unit causing your symptoms and likely a very costly repair.
Maybe I'm wrong here but I sure don't know of a way to put ABS in bypass mode other than to let ford use the scanner, $65 to blead, that's cheap compared to a $1500.00 ABS unit!!!

 

Thank you folks for your responses. I lack machenical skills and for certian the terminology. I will not talk about the ABS sensor stuff again as I did previously because I am not confident that I stated it correctly.

At any rate, yes I do have ABS.

To keep it simple as I can, it is simply this. When I apply the brakes, the brakes seem normal. As I begin to come to a complete stop the pedal all a sudden begins traveling a little further and you can hear a grinding sound (Or this is a wild example but it would be a noise as if you had rubber flip flops on and they were wet and your feet slid on the flip flop makeing a grinding noise on wet rubber). I know it is a weird example it is the best I can do.

I hear you OKI maybe I need ford to look at it. I just know that the labor they charge is salty.

 

Okiboy,

Just one more thing. The pedal noise/travel existing long before I took it to a mechanic. He did mention that he notices contamination in the fluid before he did any work on it.

 

Sleepycreek, Brake fluid it a major contributor to ABS failure. Trying to convince people that it should stay clean is like trying to get your kids to brush their teeth at night without you having to tell them! Dont worry about the inability to understand terms, just ask, its that simple.

 

This is the latest: the ABS system causing unwanted pedal travel activity is due to both hubs going bad. A next question: advise to apply aftermarket hubs or ford factory hubs?