'11 Eco Bad Vacuum pump behind headlight???
07-03-2014, 10:20 AM
#31
Just had my pump put in, works fine now. Full braking is restored. The new pump and model number is the same as the original OEM pump. It might be an internal revision, or the pump manufacturer might have made a internal modification but sadly, otherwise it appears to be the exact same unit (bl3z-2a451-a) that has been failing since 2011.
09-17-2014, 01:20 PM
#32
one oil change after my pump was replaced I was told I need a brake job........
So I drove my truck for a month with this problem as there were no parts available, and now my front brakes are shot. rear brakes are over 80 percent left, coincidence? I bet there is a brake bias issue when vacuum is not correct and it destroyed my front pads / rotors. Thanks Ford.
So I drove my truck for a month with this problem as there were no parts available, and now my front brakes are shot. rear brakes are over 80 percent left, coincidence? I bet there is a brake bias issue when vacuum is not correct and it destroyed my front pads / rotors. Thanks Ford.
09-18-2014, 09:48 AM
#35
my truck has 56k and 50k of it is light highway duty, probably 3 k were with the pump in-op. how would my front brakes deteriorate like that so quickly? I have neber had a vehicle with such clear bias issues. It still stops wonky. So in a effort to understand what is going on I ask, are you an engineer / mechanic? I ask seriously and not to be snotty but depending on how the master cylinder and booster are designed I need to understand. Otherwise the truck is going back in.
09-18-2014, 10:01 AM
#36
I found rotors in front with cracks causing high speed braking vibrations, 2011 F150, 63,000 miles, Deer stops, replaced with drilled and slotted type. Perfect !
Last edited by papa tiger; 09-18-2014 at 10:03 AM.
09-19-2014, 08:54 AM
#37
Insult to injury after my Oil change / brake service this week I drove on the highway (to get home) for the first time and the shield underneath the truck came loose, bent under the truck, melted to the exhaust, and drug on the ground.
09-19-2014, 09:10 AM
#38
Senior Member
my truck has 56k and 50k of it is light highway duty, probably 3 k were with the pump in-op. how would my front brakes deteriorate like that so quickly? I have neber had a vehicle with such clear bias issues. It still stops wonky. So in a effort to understand what is going on I ask, are you an engineer / mechanic? I ask seriously and not to be snotty but depending on how the master cylinder and booster are designed I need to understand. Otherwise the truck is going back in.
There is a non-adjustable proportioning valve somewhere by the drivers feet that determines the front-rear brake bias. The vacuum booster that's mounted to the rear of the master cylinder. The booster only provides assistance to reduce the pedal pressure. It does not have any effect upon the remote proportioning valve. If you feel the valve is defective, you can buy adjustable ones and then turn a **** to increase the rear braking bias.
fyi- I got about 80,000 miles out of my front brakes. Because of weight transfer the fronts do the majority of the braking. This is born out by the front brakes generally being bigger/better. Because the front brakes do the majority of the braking it's not uncommon for them to experience the majority of wear. Typically I get two-three front brakes to a set of rears.
Many have thrown the belly pan plate away. It's purpose is to give the truck an .00001% boost in gas mileage.
09-26-2014, 04:40 PM
#40
Ford Customer Service
Crystal