Brake Light and Check Brake System

[harpo]

I have no idea how they could justify 2 hours... When I did mine, it was literally 15 minutes and no tools required, although a small screwdriver or pick might be helpful for the quick disconnects in the locations circled below, and the disconnect on the bottom right in the picture could be a bit harder to reach then the other two that are obvious and in plain sight.

If you can rotate tires, there are many more steps and critical thinking required to do that than there are to change this hose.

Maybe the $400 is so they can include diagnosis time? There is a chance that something else in the relatively simple vacuum system is causing the problem;

7,8, and 9 in this diagram are the hoses involved, and the loss of assist is caused when the vacuum in the brake booster fed by hose #7 has no vacuum.

I believe the common cause for the problem is that one of the check valves circled fails and allows vacuum to leak back into the intake manifold through hose 8.

There was a TSB for contamination in hose 8 causing problems as well, and ford might be requiring the technician to check for that or even clean out that hose as well, and cleaning that hose out could be adding a bit of time.

But the contamination TSB was for a fairly narrow number of 2021 Broncos, so it's unlikely to be your issue, and would also behave differently I believe.

It was absurdly easy. I hit the timer on my phone, picked the part up off the basement floor, grabbed my coffee and walked out to the garage. Opened hood, looked at it again for about 20 seconds, went back to the basement for a screwdriver and plyers.

Popped off the connections on the front side, pulled out the cable restraining tab (the hardest part), plugged the new one in. Went to get a step ladder so I could reach the other end tab, popped it off, cut the restraining tab (new part didn't use this tab) popped the other end in, plugged the wire back in and turned off the timer at 13:57.06.

Started it up, everything seemed fine, went to home depot picked up 720 lbs of concrete for a yard project, on the way home floored it all the way up the hill (at least till I hit 90, figured i should slow back down), couldn't set off the brake warning so I think it worked.

THANKS! Seriously, you saved me a few hundred bucks, the part was $184 shipping $35 and tax brought it up to $215.

I am annoyed I had to do it at all though, occurred 2 months and 2000 miles past the the 3 yr 36k warranty.

I have to show off my level load area, high tech solution to slide in bags of concrete...

Sponsored

 

[Paughco]

As discussed here: https://www.bronco6g.com/forum/thre...light-on-22-obx-with-2-7-liter-engine.123707/ my Ford dealer fixed the intermittent brake warning light on my Bronco under warranty. No charge. The problem hasn't come back. I'm happy.

Seeya
ATB

 

[crenca]

I got this "Check Brake System" warning today - it only takes one or two miles of driving after resetting DTC codes in Forscan for it to come back for me. Most folks don't list DTC codes so here are mine for reference:

===PCM DTC P0555:00-6C===
Code: P0555 - Brake Booster Pressure Sensor Circuit

===ABS DTC P050F:00-6D===
Code: P050F - Brake Assist Vacuum Too Low

===GWM DTC U2402:00-49===
Code: U2402 - Ethernet Failure With Telematic Control Unit Module (TCU)

===APIM DTC U0198:00-0B===
Code: U0198 - Lost Communication With Telematic Control Module 'A'

===TCU DTC U1A01:09-49===
Code: U1A01 - Communication Link

===TCU DTC U3000:49-0B===
Code: U3000 - Control Module


I don't know if the last 4 have anything to do with the first two (brakes), but since my DTC codes are usually clean when I check with Forscan I list them in case they are related and not another problem.

@harpo , @VADER & @zuke , what website did you guys order part MB3Z-2420-L (assuming it has not been updated) from? I know some of these online Ford part sites are scam..ish...

 

[Jason519]

I got this "Check Brake System" warning today - it only takes one or two miles of driving after resetting DTC codes in Forscan for it to come back for me. Most folks don't list DTC codes so here are mine for reference:

===PCM DTC P0555:00-6C===
Code: P0555 - Brake Booster Pressure Sensor Circuit

===ABS DTC P050F:00-6D===
Code: P050F - Brake Assist Vacuum Too Low

===GWM DTC U2402:00-49===
Code: U2402 - Ethernet Failure With Telematic Control Unit Module (TCU)

===APIM DTC U0198:00-0B===
Code: U0198 - Lost Communication With Telematic Control Module 'A'

===TCU DTC U1A01:09-49===
Code: U1A01 - Communication Link

===TCU DTC U3000:49-0B===
Code: U3000 - Control Module


I don't know if the last 4 have anything to do with the first two (brakes), but since my DTC codes are usually clean when I check with Forscan I list them in case they are related and not another problem.

@harpo , @VADER & @zuke , what website did you guys order part MB3Z-2420-L (assuming it has not been updated) from? I know some of these online Ford part sites are scam..ish...

Just got fixed Friday while I still have warranty if your warranty has ran out buy the line and do it yourself I think it’s around 110 bucks

 

[zuke]

@harpo , @VADER & @zuke , what website did you guys order part MB3Z-2420-L (assuming it has not been updated) from? I know some of these online Ford part sites are scam..ish...

Honestly not sure where I ordered it from, The site was actually a dealer in New Jersey, and had that scam-ish feeling to it ...

I've since kinda switched to using TASCA parts for most of my orders, as they are more established in the OEM parts business;

https://www.tascaparts.com/search?search_str=MB3Z-2420-L

Looks like the cost has jumped up on the part too

 

[crenca]

Thanks @zuke , I stopped by my local dealer this morning (who have more of a "we don't really know what we are doing" vibe then "scam-ish" ) and they were willing to price match the TASCA price and said it should arrive tomorrow.

It was funny, I sat there for 10 minutes waiting for the parts counter to open listening to service advisor "Tiffany" talk to folks dropping off their Ford's for service. "Tiffany" (if that is even her real name ) one could tell does not know the difference between a wheel and a tire, but those folks just kept on talking "You see, it makes a vroom vroom noise and then it jerks a little....", to which "Tiffany" would say "We will call you after the inspection. Would you like your cabin air filter replaced?"

The vanity of it all

 

[harpo]

Thanks @zuke , I stopped by my local dealer this morning (who have more of a "we don't really know what we are doing" vibe then "scam-ish" ) and they were willing to price match the TASCA price and said it should arrive tomorrow.

It was funny, I sat there for 10 minutes waiting for the parts counter to open listening to service advisor "Tiffany" talk to folks dropping off their Ford's for service. "Tiffany" (if that is even her real name ) one could tell does not know the difference between a wheel and a tire, but those folks just kept on talking "You see, it makes a vroom vroom noise and then it jerks a little....", to which "Tiffany" would say "We will call you after the inspection. Would you like your cabin air filter replaced?"

The vanity of it all

My order was pretty similar to zukes. Seemed goofy, so I went to the official ford parts site and tried to order through them which sent me to a dealer in Michigan who wouldn't ship to Utah. Then did a Utah dealer parts department check and they wanted over $300 so I just went back to the first site.

Mine was shipped by "broadway trucks".

Nice that you got your local dealer to match the tasca price, the tasca price in zukes link is what I paid but the shipping cost was pretty high.

 

[CalvinT]

I've shopped different online dealers including Tasca. I've saved on shipping on larger items such as a door bag when using an online dealer that's closer to Phoenix. I also saved on sales tax because they didn't sell a lot to Arizona.

There are several online dealers that are good. They don't all have the same prices nor shipping rates.

 

[BroncoAdventure]

Came in today to my local ford dealership for an oil change and tire rotation. Now my dash brake light stays illuminated and the app is showing an abs fault. Never had this issue prior. The tech screwed something up. These buffoons been trying to figure out for the past 4 hours. Wtf man. Battery test came back ok, they drove it and mechanically everything works. Idk

 

[zuke]

I'd bet they knocked the connection off on one of your wheel speed sensors... (Or pinched the wire, and they need to put a new one in now)

 

[crenca]

All right, this part came in today and got it installed. Brake vacuum assist is back to normal. I took about 45 minutes including finding tools, etc. I also broke the little tab on the electrical connector - me and stiff plastic tabs 1/2 the size of the end of my finger just don't get along - but I have it secured with electrical tape like God intended. That lower clip is a bitch, left foot on bumper and right foot on step ladder which is scooting away...forces you to work fast before your in a splint that even your younger self would have found painful

Relevant DTC codes are cleared, but I'm still getting those ethernet/telamatic control/communication codes, so I am assuming unrelated to this issue. I turned off updates on the central screen a few months ago, and yesterday I noticed by Ford Pass app has not successfully communicated with the Bronco in about as much time. Need to track this down. EDIT: no, I had turned software updates back on at some point

NOTE: if you have a manual easy way to tell if this is your issue is to get into boost (accelerating, uor p a hill, etc.) a bit and with the left foot hit the brakes lightly: the peddle will be real stiff because of no assist

Thanks @zuke, @harpo , and everyone else who posted the fix.

 

[Gambitl7]

SSM 51201 2021-2022 Bronco - 2.3L - Intermittent Illuminated Brake Warning Lamp With DTC P050F In The ABS Module
Some 2021-2022 Bronco vehicles equipped with the 2.3L engine may exhibit a red brake warning lamp and brake system warning message in the instrument panel cluster (IPC) with a diagnostic trouble code (DTC) P050F in the anti-lock brake system (ABS) module. This may be accompanied by an intermittent firm brake pedal after driving for long periods at highway speeds. This may be due to improper sealing of an internal diaphragm within a brake booster vacuum line. To correct this condition, replace the vehicle's vacuum line with the latest version service part number MB3Z-2420-H or later. Refer to Workshop Manual (WSM), Section 206-09 for installation instructions. For claiming, use casual part 2420.

Why is this not covered under the warranty? Just had the dealer replace the vacuum hose because of the warning light and while traveling at highway speeds it would become hard to press the brake.

 

[crenca]

Why is this not covered under the warranty? Just had the dealer replace the vacuum hose because of the warning light and while traveling at highway speeds it would become hard to press the brake.

You could replace it yourself - just plastic clips off then on. If working under the hood is not your thing in the least, have a local mechanic (or even just Jiffy lube experienced person) do it for you.

unfortunately it does seem to be a consumable (like shocks, brake pads, etc.), lasting about 30k miles.

As for your question, the answer is 'because warranties are not worth the paper they are written on'...

 

[Dirtrider]

This known issue just happened to my 2023 Bronco Badlands and now I’m having to drop almost $600 to fix it. Ridiculous on a two and half year vehicle that was $60k


QUOTE="Ford Motor Company, post: 1712575, member: 21911"]
SSM 51201 2021-2022 Bronco - 2.3L - Intermittent Illuminated Brake Warning Lamp With DTC P050F In The ABS Module
Some 2021-2022 Bronco vehicles equipped with the 2.3L engine may exhibit a red brake warning lamp and brake system warning message in the instrument panel cluster (IPC) with a diagnostic trouble code (DTC) P050F in the anti-lock brake system (ABS) module. This may be accompanied by an intermittent firm brake pedal after driving for long periods at highway speeds. This may be due to improper sealing of an internal diaphragm within a brake booster vacuum line. To correct this condition, replace the vehicle's vacuum line with the latest version service part number MB3Z-2420-H or later. Refer to Workshop Manual (WSM), Section 206-09 for installation instructions. For claiming, use casual part 2420.

I have had the 'check brake' light/warble twice in the last two months, last time going to the dealer for an oil change and alignment. I couldn't see any difference in brake performance but I'm getting ready for a trip so I had mine replaced at the Dealer. I didn't know the cause so most of the labor cost was diagnostics. The part from the dealer was $326 (does have a 2 year parts/labor guarantee). Mine had been replaced just over two years ago under warranty per a TSB but it was outside the 2 year warranty on parts so it was all on me. One of my concerns is that I flat tow my Bronco with a motorhome and the required auxiliary braking system pulls a vacuum on the booster through the vacuum sensor port at the bottom of the brake vacuum booster. I suspected that a check valve might be the problem but I can't say that I fully understand the vacuum booster plumbing with a turbo. I'm wondering if I should install a 'backup' check valve in the hose between the vacuum booster and the vacuum line/assembly. My original auxiliary braking system vacuum line was plumbed in that way but teeing into the vacuum sensor on the booster is a cleaner setup. Replacing the MB3Z-2420-H assembly would be an easy swap had I known what the issue is. Code says ABS issue, not vacuum issue so not clear at the time. But now thanks to this forum I know. I kept the removed MB3Z-2420-H assembly so maybe I'll get a chance to do some failure analysis.

 

[HotdogThud]

It's just not something that's covered unfortunately.
It has a TSB, but that doesn't extend the warranty. It's only covered under 3/36
Your best option is to contact Ford and ask them, maybe they'll give you some assistance in getting it covered. Nobody on here is going to be able to do that though.

Man, the logic on this is mind blowing. Mine is currently in for this *for the second time*, on the updated part, no less. They replaced this at 48k, under warranty as well, but are now claiming that that repair was a good faith repair that they did. Cue today and they want north of $650 to fix this. (What actually happened is that they replaced the brake booster when I told them it was more than likely the vacuum line, and had a bit of egg on their faces when I brought it back a day later with the same issue. "Oh, huh, looks like you were right....").

Even under the premiumcare warranty, it fits the criteria and would 100% be covered:

and from the ESP website:

IMO, a TSB is 100000% admission of a defective part and/or (sub)system

This is telling too:

Mine had been replaced just over two years ago under warranty per a TSB but it was outside the 2 year warranty on parts so it was all on me.

Mine was replaced exactly 25 months ago.

Sponsored