I think we all might have a leaking(minor to major) hydo boost.
I just found out mine has been leaking a little for awhile now
I am going to replace as soon as I can

 

Doing a 2001 excursion ... aftermarket shows only one master cylinder.. motor craft shows two 1 with hyraboost BRMC26 and one with vacuum booster BRMC27. this is stroked differently .. try the correct master cylinder.

just found out the hard way

 

Not trying to bust anyone's *****. But I'm researching soft breaks and thinking it's a master cylinder. I see no fix reported

 

I was told by a member on here a while ago Ford had an issue with our master cylinders where the internal piston would over travel and force fluid past the cruise control cutoff sensor. Ford blamed the sensor for the fluid leak (and fires) but the real culprit was the MC. I have noticed on my truck the hotter the outside temps get the weaker the brakes and I get a progressively louder squeak/squish noise when the pedal is pressed. Hydroboost is also leaking a small amount.

So if the hydroboost only provides power brakes like a vacuum booster then the pressure and efficiency lies in the MC. If it is overtraveling causing leaks then maybe the pressures are off internally (+/-) causing poor performance. As soon as I have some money I am going to replace both units on my truck this summer.

 

Ok i'm guessing no one has heard anything about this. I'll chime in because i am about to put my 3RD set of rear brake calipers on my truck in the past year. Not sure why i keep going through them but i have the same symptoms and then eventually one of them will start dragging followed by the other. Just wondering if maybe this problem is related to what you guys are having going on?

 

Have you replaced the hoses? Not the lines, the hoses.

I'm happy to say mine was as simple as replacing the MC. I read through a few threads here on the brake issues and the one issue that couldn't get me past the MC is that with the truck not running, I could push the pedal slowly and it kept sinking.

 

Yeah i just replaced the right rear hose on Saturday in the rain brakes felt good for 50 miles and now there back to being inconsistent

 

Any update?

 

Well reading this, i believe that's what i just lost.. was turning and heard a pop, lost steering and brake assist. Having just lost and replaced my serpentine i knew that wasn't it. I looked through the driver wheel well and saw something. Reached in and pulled out a blue cylinder that said compressed gas. I'm assuming this was part of my hydroboost . Now i gotta look on how to replace that.

 

That blue cylinder is the accumulator. Hydroboosts can be rebuilt but you will need access to nitrogen to recharge the accumulator. I highly recommend evacuating the accumulator before recharging it so you don't have any residual moisture.

 

Great time to just replace with a new oem unit
https://smile.amazon.com/gp/aw/d/B00...?ie=UTF8&psc=1

 

If not a hard job. Enjoy.

 

Just go for the whole package!

 

Convert to electric brake booster. 😱

 

I didn't think you could recharge the accumulator? Has any buddy done this? Be nice if you could just change it out also. I loss my idler pulley once and use mine up also. Real shame to have to change out the whole hydraboost.