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If it this 2007 Columbia When there is a brake application…

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If it this 2007 Columbia When...
If it this 2007 Columbia
When there is a brake application
With the trailer
Sometimes the trailer brakes stays on
Without trailer too sometimes the brake light stays on
I checked the drake switch air line there is minor air in it which trigger the tractor protection valve and brake light
Changes all valves in system
Plz help
Something is not completely dumping air
Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 10 minutes by:
2/2/2016
Technician: Wayne, Journeyman replied 2 years ago
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,330
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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Hi I'm Wayne

I will help you with this

What valves did you replace

Let me know ,Please

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Customer reply replied 2 years ago
Tractor protection, dash valve, foot valve
Customer reply replied 2 years ago
When I apply brake and release it
Very minor like 5-10 psi air remain on trailer side airlines which trigger it
Technician: Wayne, Journeyman replied 2 years ago

Thank you for that

If this is doing it on the trailer, slow release it is 2 things

1st The QR valve for the trailer

or the mulit fuction valve on the trailer

I would replace the QR valve 1st $17.00

I hope this helped you

Hi if this helped you

Please rate my answer 3 or more stars

If you need more info, use request button

Not Poor/Bad service

Wayne

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Customer reply replied 2 years ago
Customer change trailers daily
It's cant be wrong in all trailers
Technician: Wayne, Journeyman replied 2 years ago

Hi Thank you for that

Sorry about the delay

You did not mention it was all different Trailers

You need to give all info that you have, as I am not there ,

seeing it,

if they are dragging , not releasing all the way, replace the QR valve on the tractor

It is located on the back of frame , 2 lines go to it

Hi if this helped you

Please rate my answer 3 or more stars

If you need more info, use request button

Not Poor/Bad service

Wayne

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Customer reply replied 2 years ago
ok here is the detailed
when bobtail- on brake application truck application fine but sometimes brake lights stays on but truck brakes are released
and as u know there are 4 lines on tractor prot. valve
1) from dash valve red one
2) 1/4 line for brake switch
3)brake control (primary) from foot valve
4) brake control (secondary) from foot valve
when lights stay on there is a very little pressure that stays in line (2) , (3) ,(4)
which trigger the lights
tractor brakes are ok.
when trailer hooked up same thing but this time trailer brakes remain applied, dragged but truck ok
same way if i un hook any one of 3 lines it releases
Technician: Wayne, Journeyman replied 2 years ago

Hi Thank you for that

You gave a good explanation, of Issue, Good Job,

Ok looking at what valve you replaced

I would like yo u to do something

break loose air line at the multi-function valve of tractor

that is the one that has brake/paring valve combo

let me know

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Customer reply replied 2 years ago
I didn't understand what u said
Technician: Wayne, Journeyman replied 2 years ago

HI

With the tractor not on trailer

back on the frame rail , you have vale/vales that go to the brake chamber,

loosen that line and see if air leaks out ,and release the brakes

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Customer reply replied 2 years ago
That Valve is ok
Checked it
Technician: Wayne, Journeyman replied 2 years ago

Thank you for that

now got to each Brake canister , and loosen line

on the service side,brakes set, then parking brake set

you should not see or hear any air

Ps , I go off for the night, will , continue in the morning

Wayne

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Customer reply replied 2 years ago
Truck is out on road now
Could there be problem with truck canister as I see no back pressure at tractor delivery side of foot valve
Technician: Wayne, Journeyman replied 2 years ago

Morning

Thank you for that

Yes the brake chamber , that is why i mentioned to

loosen the lines and se if you get air,

you have a brake canister internal leak

I hope this helped you

Hi if this helped you

Please rate my answer 3 or more stars

If you need more info, use request button

Not Poor/Bad service

Wayne

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Technician: Wayne, Journeyman replied 2 years ago

Hi

Just following up with you

did my answer help you

let me know ,Please

Wayne

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