The best air brake yellow knob depends on the valve it must fit: choose the World American WA248433 for a 3/8-inch PP-1-style valve stem, or consider a yellow-and-red replacement set for a threaded push-pull dash valve. The products below cover single-knob repairs, MV-3-style applications, and paired parking-brake and air-supply controls. Confirm the existing knob’s part number, stem or thread style, and valve application before ordering.
| Product | Best For | Configuration |
|---|---|---|
| World American WA248433 | PP-1-style stem replacement | Yellow knob and pin |
| Torque TR298817 + TR298818 | MV-3 valve knob replacement | Yellow and red pair |
| AUPARTIK | Threaded push-pull valves | Yellow and red pair |
| Saihisday | Replacing 298818N/298817N knobs | Yellow and red pair |
| Biyouparts | MV-3 truck applications | Yellow and red pair |
World American WA248433 Yellow Knob
This World American replacement is a PP-1-style yellow dash valve knob with an integrated pin. Its listed stem size is 3/8 inch, and the product description identifies it for heavy-duty truck air brake control panels and common dash valve applications. ABS construction is described as resistant to cracking, fading, and wear.
Best for: Buyers replacing a single yellow knob on a compatible 3/8-inch valve stem. It is selected because its stem dimension and PP-1-style design are specified, making it easier to compare with an existing part.
Check before ordering: This is a knob-and-pin assembly, not a yellow-and-red pair. Confirm the valve style and stem size; the 3/8-inch specification may not match threaded push-pull knobs.
Torque MV-3 Yellow And Red Knob Set
This Torque set includes a yellow parking brake knob and a red trailer air-supply knob. The listed replacement references are Bendix 298818 for the yellow knob and Bendix 298817 for the red knob. The product description specifies installation on a threaded MV-3-type dash valve.
Best for: Buyers replacing both color-coded controls on a compatible threaded MV-3 valve. It is a useful comparison choice when the yellow parking knob and red supply knob need replacement together.
Check before ordering: The listed application is specific to threaded MV-3-type dash valves. Do not assume it fits a 3/8-inch stem-style PP-1 knob assembly.
AUPARTIK Threaded Push-Pull Knob Pair
AUPARTIK supplies one yellow parking brake knob and one red trailer air-supply knob. The description identifies them for threaded-type push-pull valves and lists applications for Peterbilt, Kenworth, Volvo, and Western Star trucks. Listed yellow-knob references include 298818, 298818N, and TR298818; red-knob references include 298817, 298817N, and TR298817.
Best for: Buyers who need a paired replacement and can match the listed part numbers and threaded valve style. The truck makes and part references help narrow down whether this set is worth checking against the existing controls.
Check before ordering: The listed vehicle makes do not establish fitment for every model or valve configuration. Verify the exact part number and valve type for the truck.
Saihisday 298818N And 298817N Set
This Saihisday set includes yellow and red air brake knobs identified with part numbers 298818N and 298817N. The description says the knobs fit threaded push-pull valves and lists replacement references including Bendix 298818N, Euclid EBN298818N, and Meritor R955298818N. The product is described as plastic with a wear-resistant construction.
Best for: Buyers matching a threaded push-pull valve and one of the listed part-number references. It is selected as a paired option for replacing both parking-brake and air-supply controls.
Check before ordering: The description’s fitment is based on valve type and replacement references. Confirm both controls’ part numbers rather than relying on color alone.
Biyouparts MV-3 Knob Replacement Pair
Biyouparts includes a yellow parking brake knob and red trailer air-supply knob. The product description specifies 5/8-inch threaded MV-3 dash valve control and lists references such as 298818, 298818N, TR298818, 298817, and 298817N. It also names Peterbilt, Kenworth, Volvo, and Western Star applications.
Best for: Buyers seeking a paired set for a truck with a compatible 5/8-inch threaded MV-3 valve. Its stated thread size offers a specific detail to compare with the existing assembly.
Check before ordering: The 5/8-inch thread and MV-3 application are important limitations. Avoid choosing it if the existing valve uses a different mounting style.
Buying Guide: How To Choose An Air Brake Yellow Knob
Does the valve use a stem or threaded push-pull fitting?
Start with the mounting style. The World American WA248433 is listed for a 3/8-inch stem and PP-1-style application. The other featured options are paired yellow-and-red controls described for threaded push-pull or MV-3-style valves. These designs are not interchangeable based on color alone.
Do you need one knob or a complete pair?
Choose a single yellow replacement when only the parking or dash knob needs changing and its design matches the existing valve. Choose a pair when both the yellow parking-brake control and red air-supply control need replacement. Check package contents and part references before ordering.
Which part numbers should you compare?
Compare the number on the current knob or valve with the replacement references in the product description. Common references among these paired products include 298818 or 298818N for yellow and 298817 or 298817N for red. Confirm the exact valve and vehicle application when part numbers differ.
What should you verify before installation?
- Match the valve’s stem or thread style and size.
- Confirm the yellow knob’s intended function and corresponding part number.
- Check whether you need a yellow knob only or a yellow-and-red set.
- Use the vehicle or valve manufacturer’s service information if fitment is uncertain.
Frequently Asked Questions
What does a yellow air brake knob typically identify?
In the products listed here, yellow identifies the parking brake knob. Confirm the control labels and vehicle configuration before replacing a knob.
Are all yellow air brake knobs interchangeable?
No. Knobs can differ by stem size, thread style, valve type, and part number. Match those details to the existing component.
Can a 3/8-inch stem knob replace a threaded knob?
Not necessarily. A stem-mounted PP-1-style knob and a threaded push-pull knob use different mounting descriptions. Verify the valve design first.
Should I replace the red knob at the same time?
Only if the red air-supply knob also needs replacement or you want a paired set. Check that both replacement knobs match the valve and listed part numbers.