Force air brakes
Right after I took possession, new, of my 2015 Force 37BH, I had a brake issue similar to yours. There is an equalization valve right under the brake pedal; it was malfunctioning. It’s purpose is to equalize pressure in the brake lines as brake pedal pressure is applied. The length of the air lines requires this valve to work so that equal air pressure arrives at all four wheels at the same time. Braking, until the valve was replaced, was somewhat compromised and uneven. This malfunctioning valve made a hissing/squeaking/squealing noise when stepping on the pedal. Not sure if this valve is your issue but agree that Freightliner should look at it right away.My 2015 stops right now if I have to...one can usually smell the hot brakes shortly thereafter but the stopping power of the rv is excellent.
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