You don't need to put any weight on the seat to find a leak. Just air it all the way up and hold the button for 3.79 seconds after its aired all the way up. There will be enough pressure in the bags to detect a leak.
This isn't some kind of fancy computer controlled seat is it?
My driver's seat keeps sinking down
Discussion in 'Freightliner Forum' started by expedite_it, Jan 29, 2022.
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Hammer166, God prefers Diesels, AModelCat and 1 other person Thank this.
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Dude’s got a leaky seat. Seat Air springs and switches go bad all the time. Seen some replaced under warranty. And yes a leaky seat can bring a parked air system down to nothing in no time. The whole air system is tied together. Put a shutoff valve on the supply line before the seat switch to keep the leak from bringing the rest of the system down in the future.
expedite_it Thanks this. -
While standing on ground with cab door open and engine off Hit seat switch and fill seat up with air. Let it go all the why up. Spray bubble leak finder or soapy water all over the air spring, switch, line, and connectors. Look for suds that grow or bubbles. If none there then it may be were the supply line comes from a distribution manifold somewhere or at air tank fitting for it. Or the passage fitting thru the cab floor if it is routed that way.
expedite_it and God prefers Diesels Thank this. -
When I rebuild air systems on the old stuff I work on the First thing I do is tap in a permanent shutoff valve into an air tank for shop air. For two reasons.
One I can have air to the whole system for checks and to run everything that uses air quietly for leak detection without having to fire the engine every time i need to recharge the system. 1000 times an hour.
Two instead of waiting 5 minutes for engine compressor to charge I can use shop air to charge the system and release brakes immediately to idle truck out of shop to let warm up outside and not fill shop with cold start smoke.Last Call and God prefers Diesels Thank this. -
Speedy356, IH Truck Guy and Siinman Thank this.
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Ok I want to play.
Proper soap to water ratio for making leak detection fluid per quart: 1 quart of distilled water, 3 tablespoons of dawn dish detergent or equivalent, add 2 teaspoons of liquid glycerin to make the bubbles last longer, which also makes them easier to detect. For mixing a pint, simply half amounts used.expedite_it Thanks this. -
expedite_it Thanks this.
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But i lost all my confidence in the mechanic. Remember that old adage: If you want something done right , do it yourself.Last edited: Feb 1, 2022
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Mechanics, as a rule, are not known for their patience with people. Machinery, yes. They'll work on something as long as they need to to fix it but they draw the line at baby sitting recalcitrant rookies.
If it comes down to a choice a company will replace a driver before it replaces a mechanic. Good mechanics are hard to find.
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