Dealer told me the reason why I get the brake issue when turning to the right is my ABS is activating due to my bigger tires. If this is even true is it possible to calibrate it for my bigger tires?

What doesn't make sense to me is why does the braking feel like I'm loosing braking power when the "ABS" is turning on?

 

your abs should NOT be active by making turns, your dealer is a retard

second yes, you can tire size in the pcm by figuring out the rev's per mile on the bigger tires.

 

I agree it shouldn't... It doesn't make any sense to me but ever since I installed the 2" AS spacer when I am going down a hill that turns right while braking it sometimes gives out and makes a grinding/vibrating noise and my brake pedal feels like it goes limp and to the floor. I am forced to steer straight in order to brake 100%.

What is the PCM? is this something only the dealer can do? Also, is there a calculator that I can figure out my rev's per mile?

Thanks!

 

i have seen a programmer by (i think) bully dog maybe HYPERTCH. it plugs into the computer reader and you punch in the new tire size. then ta-da. all better. my 09 hasnt had any problems so far w/ 35" tires. It will also correct speedo inaccuracy as well.

 

I'm selling a brand new hypertech...pm me if interested.

 

Make sure the tire is balanced correctly. Try moving the tire to the other side adns ee if the problem moves with the tlre. IE the problems is now on left turns. Bigger tires can be difficult for some places to balance correctly.

 

its not ABS thats the issue turning, its your traction control that is similar to how ABS operates by reading wheel speed sensors

 

I haven't tried it on an '09, but on older trucks, there was a narrow range of tire sizes you can adjust for. Getting a programmer would probably be the best bet.

 

The tires are balanced correctly I had them done twice and had the alignment done twice. It doesn't happen all the time just once in a while on that perfect turn/downhill slope while braking. I have only had it happen twice so far but that is twice too many lol.

Could it be a break line getting pinched and the brakes not getting fluid?

 

Let's see...

Going downhill
Turning
Braking
Wide tires

Sounds to me that the braking/ABS system is doing it's job -

In a situation like that, with the front end lifted, and wide tires, it is entirely possible that your right front tire is in fact skidding and the ABS is being activated.

 

If you know a Ford tech, They can use ther IDS to program tire size.

You might also check your front wheel bearings, could be loose or worn out, causing erattic speed sensor readings.

 

Could this be possible? The truck is a 2009 with only 7k miles?

 

With only 7K, i don't think the wheels bearing should be bad. But you might have them checked....

 

Well when you take a turn your outside tire travels further than your inside tire. (the reason for open diffs). The traction control is aware of this and allows minor speed differentials between tires. Adding larger tires magnifies the computer's perception of speed difference, and hence engages the brakes. Am I missing something here? Seems like a simple concept, eh?Just about everyone that has installed larger tires has complained of this.

 

That doesn't make sense.

Larger diameter tires would make the computer think you were going slower than actual speed but the speed difference between the inside and outside tires would be the same in terms of percentage so I don't see how this would make intervention more likely.