HELP!! Air pressure gauge issues

Chico22mag · Jan 24, 2022

RubyEagle said: ↑

I wouldn't think so. It's not smart enough to have 25 computers like the latest PACCAR over complicated monstrosities. I did see separate sensors labeled primary and secondary air pressure. Also Parking Brake air psi etc. Just check Amazon or Fleetpride before the dealer. They wanted $341 for brake app. sensor. Fleetpride is getting it next day for $89. Also another member here sent me a link to Amazon for $18.97 so l ordered three of those for spares
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Very helpful,thank you, I will hit up the Kenworth dealer and see if I can get a part number or something then do some shopping around

bowhunter67 · Jan 31, 2022

The air pressure sensors are part #q21-1041 just tried to replace mine with some on line and all they did was go to 45psi and my brake gauge went to 45psi so off to allstate pete to get oem $239 each dont waste your money on china junk they don't work.

Pete357 · Jun 5, 2022

bowhunter67 said: ↑

The air pressure sensors are part #q21-1041 just tried to replace mine with some on line and all they did was go to 45psi and my brake gauge went to 45psi so off to allstate pete to get oem $239 each dont waste your money on china junk they don't work.
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Pete357 · Jun 5, 2022

Hello I have a question about Air pressure. I have a 97 Peterbilt 357 and my primary and secondary gauge needles read 105 psi. My air dryer goes off constantly. We put a direct reading pressure gauge at the air dryer and I was reading 120 psi when it went off. My air gauge has two wires on the back and an airline. If I adjust the governor up the air pressure gauge reads higher but the air dryer is constantly going off. I’ve had a mechanic look at it and he could not figure out what was going on. Any help would be greatly appreciated

Nick 1000 · Sep 6, 2023

Neil12503 said: ↑

Hello, new to posting. I've ran out of options and am completely stumped. I have a 2006.5 W900 (it has the new style gauges) My primary, secondary, and brake application gauges are all messed up. Long story short I was driving down the highway when all of a sudden both air gauges dropped to 50 pounds the dinger and the lights on both gauges came on. There was really nowhere to pull over so I down shifted to raise rpms and I soon heard the air dryer blow off. So I breathed a sigh of relief and kept driving. Got back to the shop and I've been trying to figure out what the problem is. I cleaned all the battery terminals both ground and positive, cleaned the ground on starter, motor, and firewall bypassed each gauge in the wiring sequence tried switching all the pressure sensors around and still nothing. The brake application gauge is at about 30 and both primary and secondary gauges are just above the red. sometimes when driving the light comes on and the dinger goes off and sometimes its just above the red. If I take the brake application wire out of its sensor and put it to the primary or secondary air pressure sensor it still reads 30psi. If I take the primary or secondary air gauge wire and put it to the brake application sensor it still reads the same. Even if its completely out of air it will always be at 50 psi. The only time they will go to zero is when you turn the key off. The cruise control doesnt work because the brake application gauge is at 30. If you unplug the sensor at the fire wall the cruise works. I've tried everything I can think of. My last resort is to buy a icu but i am hoping someone has some input before i drop 2k on a new one. Any ideas?!?! Thank you very much in advance!!
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Was this issue ever resolved?

Nick 1000 · Sep 6, 2023

Neil12503 said: ↑

Hello, new to posting. I've ran out of options and am completely stumped. I have a 2006.5 W900 (it has the new style gauges) My primary, secondary, and brake application gauges are all messed up. Long story short I was driving down the highway when all of a sudden both air gauges dropped to 50 pounds the dinger and the lights on both gauges came on. There was really nowhere to pull over so I down shifted to raise rpms and I soon heard the air dryer blow off. So I breathed a sigh of relief and kept driving. Got back to the shop and I've been trying to figure out what the problem is. I cleaned all the battery terminals both ground and positive, cleaned the ground on starter, motor, and firewall bypassed each gauge in the wiring sequence tried switching all the pressure sensors around and still nothing. The brake application gauge is at about 30 and both primary and secondary gauges are just above the red. sometimes when driving the light comes on and the dinger goes off and sometimes it’s just above the red. If I take the brake application wire out of its sensor and put it to the primary or secondary air pressure sensor it still reads 30psi. If I take the primary or secondary air gauge wire and put it to the brake application sensor it still reads the same. Even if its completely out of air it will always be at 50 psi. The only time they will go to zero is when you turn the key off. The cruise control doesnt work because the brake application gauge is at 30. If you unplug the sensor at the fire wall the cruise works. I've tried everything I can think of. My last resort is to buy a icu but i am hoping someone has some input before i drop 2k on a new one. Any ideas?!?! Thank you very much in advance!!
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Was this issue resolved ?

sweetwatertoo · Sep 26, 2023

Nick 1000 said: ↑

Was this issue resolved ?
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My 2007 T800 is doing the same thing and driving me nut
Did you ever find the problem

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