Anyone having F150 brake issues (particularly 2012)-UPDATED

Sport45 wrote:

coolbreeze01 wrote:
Do the wipers quit when you accelerate?

Now that's going back a ways. I've read about wipers quitting on long uphill pulls due to loss of vacuum, but all my vehicles have had electric wipers. What year model did you have with vacuum powered wipers?

Sport45 wrote:

What year model did you have with vacuum powered wipers?

coolbreeze01 wrote:
Do the wipers quit when you accelerate?

wwest wrote:

Crowe wrote:
Crowe...go to the Ford Truck Enthusiast site, I'm certain the advice there will be more than what you can get here

Wasn't looking for advice per se but just wondering if anyone had experienced any issues.

www.f150forum.com is the biggest F150 site on the web. NEVER have I seen any common brake issues on there. If there was, believe me, it would be all over just like all the problems with the Ecoboost motor (condensation, plug gaps, carbon build up, turbo failures from modifications, etc.) .

Sounds like the brakes were previously worked on and the air never got bled out of the lines completely.

No issue with the Ecoboost at all. I believe the early ones did have problems but later production resolved most of them. Brakes SHOULDN'T have been worked on-the truck's only been in for routine maintenance. My thought was also air in the lines but dealer says it's just a bad vacuum pump. When you manufacture enough of something sooner or later one will fail. We're just going to pass it off as "one of those things" at least for now.

The news is that Ford's latest CAC condensation, "limp mode" fix (4th or 5th?), only for 2014 models, is not working in all situations.

Apparently the CAC design flaw exists in EVERY F-150 EcoBUST ever built, only happens with conducive climatic conditions coupled with driving style unique to those conditions.

L o n g drive consistently only in cruise mode, NEVER on boost, and low Rh.

Or short "cruise only" drive with high, ~80+, Rh.

Good luck.

wwest wrote:

goducks10 wrote:

TrevorL wrote:
no brake problems with my 2011 F-150.... i do have the transmission thud when i stop and take off... dealer says its not an issue but it drives me nuts..not loud but you can feel it...i need to buy a tuner to tweak the trans settings..

Oh the infamous 'bump'. Had that on my 2010 F150. Drove me nuts. Took it in to the dealer and they flashed the tyranny. Said drive it for a week or so. NO change. Took it in a second time. This time one of the tech guys rode with me. He said don't worry about it you have a warranty. In other words they don't have a fix and to just drive it till it breaks then they'll know what to fix.

There are 2 (relatively) new aspects to automatic transmission designs.

1.) FULL fuel cutoff during coastdown periods in order to improve FE. Fuel flow is cut off completely and the tranny is sequentially downshifted to keep the engine turning over above stall speed. Once roadspeed is low enough that this cannot be sustained 2 things happen simultaneously, fuel flow is restored and the tranny is upshifted.

"Bumped from behind, or "slingshot" effect" results, you feel as if the brakes were just slightly released....They were...engine compression braking was suddenly, without any action on your part, lowered.

NOW...the tranny is downshifted into first ONLY after coming to a FULL STOP...BUMP!

2. WEAK torque converter... Since the lock-up clutch is always engaged whenever the A/F oxygen sensor is in control, cruise mode, EXCEPT for clutch functionality at low speeds or stopped, the new torque converters are less "robust".

So you now need/have "hill-hold" in order to stay motionless when stopped on an incline. Some designs only engage this mode if the driver applies "extra" brake pressure once stopped, others use the ABS sensors to detect "roll".

In any case "hill-hold" will automatically apply the brakes and then DBW will be used to delay the onset of engine torque when the driver says "go", in order to have the few milliseconds to release those brakes.

Acceleration "JERK"...

Crowe wrote:
Hubby just picked up the truck. It appears to him the brakes were bad from the get-go and finally got to the point where it was noticeable enough to cause us to bring the truck in. All fixed and brakes are good. Pump was probably bad from the factory and just took it's sweet time to fail.

jus2shy wrote:
Actually, this is a problem with turbocharged gas motors. When I owned a Saturn Sky Redline, there was a TSB for the 2008 car which removed the electric vacuum pump from the system (GM figured that it was unnecessary). There were situations where shortly after first start-up, there may not be enough vacuum. So when you're backing out and hitting the brakes, you find yourself having to REALLY push down since you have no power assist. They ended up adding the part back in 2009 and adding it back to 2008 cars that customers experienced the issue in. Typically the brake system is boosted by engine vacuum. With a turbocharged motor, you have times where the manifold goes positive pressure or doesn't produce enough vacuum because of mild boosting from the turbo. So many turbo cars get an assist from an electric or mechanical vacuum pump. Seems like the assisting vacuum pump failed on your ride and you were relying purely on the engine's vacuum which isn't consistent, so it's in those short inconsistencies where the assisting vacuum pump helps shore-up vacuum assist (along with a vacuum reservoir I believe). I'm surprised I haven't heard of this so much.