Who thought "right behind the front bumper" was a good place for critical braking components. Well done Paccar.

Having that same problem stuck at 55mph with air leak , I appreciate the video 🙏

@alexjumah2013

6 ай бұрын

Same here

Thanks . I have learnt this myself by changing that valve out and poof still leaking and then found the exact issue . But ! I had no idea about the ecm droping the power . Thanks for that .

I think i have this same problem. Cant wait to go find out!!

Nice job Dr Paccar 👍 They sure do keep making these trucks uglier year by year. Give me a W900L any day.

@vicpetrishak7705

8 ай бұрын

A Volvo look alike !

Great explanation 👌 you're a paccar guy you pass the test

Having same problems thank u sir well done perfect explanation. 👌

I think you just fixed my issue. Thanks

Great video, would you do a video on t680 adaptive cruise issues that keep popping up on the dashboard after being cleared thanks

Amazing..did that apply the brake to both steers?

Was having same problems, took to Michigan KW, they put new head on it for $13k and when I left , same problem. Limped it Albuquerque to Inland KW and told them how you fixed it and sure enough, problem solved!! I noticed it when I went to do a regen… dash said foot was on brake pedal 🤔

Great tip thank you man

Great job...thank you..

Theres also an abs module in the rear as well. I had mine go out on my 579 paccar. Kept dumping air it’s a time consuming removal process

@emmanuelgrumbach5742

Жыл бұрын

Mine is doing that..... currently on its 2nd abs valve.. What was your solution?

My 2016 is doing this. It is not leaking out of foot valve and brakes do not engage when the line is crimped. Could it still be the problem or should I move on? Thanks in advance

I have a question, does that Valve create an steering stiff and a fuel power loss?

I'm buying a 2020 or 2019 Paccar mx-13 peterbilt Looking at 3 range 300,000 -380,000 thousand miles what should I look out for and is it worth it?

Dumb question. Im assuming this is done with the brakes released?

Mite be the best video THANK you 😮😮

Did you or the driver get a low fuel pressure code?

Like a sort of choked off whistling g spund like air going through a thing metal pipe. When decelerating in city driving the piping sound will happen with each down of up shift. During g the piping it feels like Jake's are applied, even when not, and as soon as piping chokes off, the power and forward thrift is returned. What on earth is going on? I have a feeling this is z simple problem. Maybe some kind of check valve or relay thereof. Abs warning lights flash as well. This 2023 t680 has only 83k miles on it

‼Perfect 👍😉😀

Question dr, Paccar was the ABS warning signs light on ??

@Dakman

Жыл бұрын

No it was not. If you have a ABS light on it's a different issue. If you have a KW T680 with ABS sensor issues but the sensor doesn't fix the problem then there is a broken wire on the left side under the cab near the driver's door. KW did a horrible job of routing ABS wires in that area and they rub thru

Is that truck disc brakes in the front?

So if I’m driving down the road and the power goes away and I see my brake lights are on while under throttle, is that a sign of the same issue? As well as air coming from foot valve

@Dakman

10 ай бұрын

That's correct. Sounds like it's just starting but generally you can test it to verify by using the method covered in the video. You can change the valve yourself with general hand tools. It's right behind the front bumper . 4 bolts and the front bumper is off.

Omg!! Genius!! Better than mechanics!

How can I check for this issue in a 2021 389 with an mx13?

That valve Dr Paccar is talking about is a brake modulator valve, which is part of the abs, that valve has wiring going to it, which sends signals to the abs system controller, which includes sending a signal to the ECM, I know this because I am a diesel technician with over 30 years of experience. I am not saying that he is wrong, just stating that there is more involved than just the abs valve and ECM.

@letstruckit9802

Жыл бұрын

I'm 2016 Pete 579 is doing this now. It is not leaking from the foot valve and brakes do not engage when line is crimped. Could it still be the bendix valve or should I move on? Appreciate it

@vicpetrishak7705

8 ай бұрын

@@letstruckit9802Are the spring brakes chambers appear leaking and the service relay valve bleeding air . Is air traveling through the dash valves ? Check the anti- compound quick release valve , the backside internal rubber disc may have a hole in it .

I just fixed that problem but my truck keeps losing air and power, its not as bad as before but my mpg has dropped really bad. Even hauling light loads when I press the accelerator pedal sounds like a small whistle (it's not the turbo, turbo is working fine) sounds like air leaks from somewhere. You think it could be the intercooler?.

@Dakman

9 ай бұрын

Yes you could have a boost leak but don't forget boost air also goes through the EGR system as well. I seen the corrugated connection pipe on the EGR valve crack and loose boost there. It connects to the exhaust manifold.

@LEGEND04131

9 ай бұрын

@Dakman Thank you very much for the reply. I'll check that. Also when I had the ABS valve problem, sometimes the Cruise control would not work, my mechanic told me that I should not have any more issues with it but yesterday the cruise control would not work again while I had a slightly loss of power, I'm wondering if something else is making the valve go bad or not work properly?.

@wendyking9759

9 ай бұрын

Mine is doing that too. The whistle like air going through a pipe. Transmission warnings and abs warning shift restriction notification. Yet there are no active warnings or fault codes. With both parking brakes set. The sir pressure STAYS at about 112 psi. No increase or decrease in pressure, and no reaction to throttling or increased rpm

Do you happen to know if the T680 with a Cummins engine has the same brake modulator valve setup?

@Dakman

Ай бұрын

The T680 have the same ABS valve no matter which engine it has. However I'm not sure if the Cummins would have the same type of safety program in the ECM

Hey I'm having similar problem I got no throttle but my truck is equipped with a roll back every time you're on a hill that comes on but now is always on n I got no throttle

I don’t have a air leak but mine is surging with the cruise on gets worse the faster you set it

2019 peterbuilt doing the same thing ,25 percent throttle after hitting the brakes

I have similar problems but I also have a low fuel pressure code and high lambda. Ever came across this problem. Thanks

DR PACCAR, I have the mist strange symptoms, where there are no active warming or fault codes shoeing on 2023 T680 screen. Yet transmission warnings are going off with SHIFT RESTRICTIONS warning showing, TRANSMISSION FAULT WARNING SEEK SERVICE warning showing. A high pitched tutbolike sound thar gets cooked of with each gear while taking off from a trafiick light . But runs great on highways. Most of the time with both parking brakes set, and truck in neutral, and raising throttle and rom, there's no reaction on air pressure. If it's at 112, it'll stay there, not go up or down.

👍

Also why does mine come and go while driving down the road? I’ll have power than it’ll go away but it comes back but when issue arrives the brake lights are on

@Dakman

10 ай бұрын

The Paccar MX13 is programed to reduce power once it sees the brake light switch is on and activated. This is a safety feature so you don't have a brake fire. Generally it's the front ABS valve that fails and bleads air backwards into the system. One indicator is air loss at the foot valve under the hood. The other way to test I cover in the video

I have a peterbilt 386 with the same issue I lose power wile driving If step on the gas it kind of feels like is a misfire I can't hear any air leaks the valve is different as well ill try changing that part and see if that helps thank you for making this video.

@user-sb8ip2ef3t

Жыл бұрын

Did you get your power back or did it make a difference please let me know. Thanks

Having this issue. But when I pinched the line nothing happens. What line do we pinch. Orange or green? If none of the lines activate the brakes it’s the foot valve?

@Dakman

8 ай бұрын

The green hose and then watch the slack adjusters on the steer axle only to see if they move and apply. Make sure to use needle nose vise grips

@18wostrucker92

8 ай бұрын

@@Dakman I just disconnected it and plugged it and it activated the front brakes. Thanks for your informative cideo

@tomas6434

7 ай бұрын

Hi, mine has 2 split green lines, do I pinch both?

I did have that same issue I end paying the dealer 2700 dollars for a part that only cost 365 dollars and You can install yourself

How to bypass to get home

Is a paccar mx13 a good engine?

@Dakman

11 ай бұрын

Oh heck NO. Nothing but problems, Our 2018 to 2020 cam issues, counter bores going bad and need cutting, BPV valve failures, DPF need replacing because they fail the flow test after the first cleaning. Just a boat load of headaches and problems. Even Peterbilt and Kenworth know they are problems. They only offered $18,000 for our 2019 Kenworth T680 and $20,000 for our 2020 T680 with the MX13. Those trucks only have 500,000 miles.

Wey better than other ppl getting paid and not good 😊

Wow

So.. in theory, if the orange line is pinched off, the rear brakes apply (in a rear ABS system on the Fritz senario)???

@Dakman

4 ай бұрын

I have not tried that theory because I have not run into that issue as of today