Red =Brakes or not used
Green/yellow right turn
Yellow/brown left turn
Black= hot
White= ground
The Bendix OEM knobs for those valves are yellow and red. Yellow is for the brake control valve, which releases the brakes on the power unit. The red is for the trailer supply valve, which provides air to the trailer, both to release the trailer brakes, to inflate the air ride suspension, and to actuate the brakes when the brake pedal is depressed.
Around the geysersthere is yellow stone.
If you're not pulling a trailer (or a trailer which doesn't have air brakes), you only push in the yellow brake control valve. If you push the red trailer supply valve in, all you'll do it dump air out the emergency line.
Most likely answer is that it has something to do with your brake chamber. Bad brake chamber, bad seal.. something to that effect. There may also possibly be blockage in the air line. When trailers are parked in the yard, at customers, etc., there's usually nothing done to cover the glad hands, and stuff can get into the air lines that way.ANSWERThe most logical answer is the trailer brakes are out of adjustment. A VERY common problem with HD air brakes. DOT will fine you and put you out of service if they catch your running with brakes out of adjustment. Call a road service and get them adjusted properly >before< you hit the road again. A driver is totally and 100% responsible for assuring brakes are properly adjusted and working correctly. If your are sure they are adjusted right make sure your air lines are connected right, red on red, blue on blue, make sure you push in both the red and yellow brake valves on the dash. (charging the trailer brake air supply) If you will hook your trailer, roll your gear up, and then tug against the trailer with both dash valves, or the one big yellow valve, pulled >out< (trailer brakes not charged) and the trailer rolls forward with the tractor your trailer brakes are Definitely out of adjustment. When trailer brakes are properly adjusted a trailer will not budge when the spring brakes are set!!! Brake shoe Adjustment does indeed affect the parking spring brakes ability to lock all wheel's when a trailer has no air charge. Dude! I can't believe you actually passed a CDL air brake test! No offense intended here but you seriously do need some refresher training!! Truckers are legally responsible to make sure their equipment operates properly and is safe on public roads at all times. You have GOT to learn air brake basic man!!
yellow stone is a volcano
Yellow Stones.
The yellow belly lizard
Yellowstone Park is in Wyoming,USA.
the yellow rock on the mts
Rwby - 2012 'Yellow' Trailer was released on: USA: 1 June 2013
Yellowstone park consists of 2,219,789 acres.
Yellowstone, yellowtail, yellowhammer, yellowjacket.