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Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 9532
Experience:  worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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Need to figure out why this freightliner Columbia locks the

Customer Question

Need to figure out why this freightliner Columbia locks the brakes under a slight apply. Seems to be better when trailer is loaded. Replace tractor protection valve and treadle valve.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Wayne replied 1 year ago.

Hi I'm Wayne

I will help you with this

is it all 4 wheels on tractor ??

when was last brake Job

let me know Please

Customer: replied 1 year ago.
Sorry for the vague post, but it's only on the trailer... locks all four under slight pressure.
Customer: replied 1 year ago.
Not sure when the last brake job was doneness but the equipment has been neglected.
Expert:  Wayne replied 1 year ago.

Thank you for that

Morning , so it is on the trailer only

2 things to do this

wrong crack pressure on the QR valve

or worn S-Cam bushings

I hope this help you

Hi if this helped you

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