The best semi parking brake valve depends on matching the replacement to the original part number, valve type, ports, and pressure specifications. The KN20021 push-pull valve is best for buyers seeking that specific replacement; the 276567 PP-1 valve lists broad cross-references; and the 276566 PP-1 is a better fit when its 20-psi release and 1/8-inch NPT ports match the existing valve. The list also includes a Sealco-style brake valve and replacement knobs, which serve different replacement needs.
| Product | Best For | Key Detail |
|---|---|---|
| KN20021 Push-Pull Valve | KN20021 replacement | Includes valve and knob part references |
| 276567 PP-1 Valve | Cross-reference matching | Lists multiple manufacturer part numbers |
| Torque 110170 Brake Valve | Sealco 110500 replacement | 3/8-inch supply and control ports |
| 276566 PP-1 Valve | Specified PP-1 replacement | 20-psi release; 1/8-inch NPT ports |
| Saihisday Brake Knobs | Knob-only replacement | Yellow and red knob set |
KN20021 Push-Pull Parking Brake Valve
This product is identified as a push-pull parking emergency brake valve. Its listed part number is KN20021, the knob is KN20903, and the listing describes it as a replacement for Bendix KN20021.
Best for: Buyers replacing a valve whose existing identification matches KN20021. It is selected because the listing names the valve type and replacement number directly, making it a straightforward candidate when those details agree.
Check before buying: The supplied details do not state port sizes or pressure specifications. Confirm the original valve’s configuration and the required knob before ordering.
276567 PP-1 Dash Control Valve
This PP-1 dash control valve lists compatibility with Bendix 276567 and several related numbers, as well as Haldex KN20021 and KN20021N. The listing also provides cross-references associated with brands and suppliers including Automann, Dayton Parts, Euclid, Mack, Meritor, Navistar-International, PAI, and Velvac.
Best for: Buyers who need to compare a wider group of catalog numbers against the number on their existing dash valve. Its long cross-reference list is the main reason to consider it.
Check before buying: A cross-reference alone does not confirm that every listed application uses identical specifications. The listing specifically advises checking the part number; also compare the original valve’s configuration.
Torque 110170 Brake Valve Two-Pack
This two-piece brake valve set is listed as a replacement for Sealco 110500, 110500N, and 110500X, among other cross-references. Its stated port sizes are 3/8 inch for both the supply and control ports. The product description says the valves are made with durable materials and tested for leak resistance.
Best for: Buyers whose required part number matches one of the listed Sealco, Euclid, Meritor, Bendix, Dayton, or Haldex references and who need the stated 3/8-inch port arrangement.
Check before buying: This item is identified as a brake valve, not specifically as a PP-1 dash parking valve. Do not assume it replaces a parking control valve unless the original part number and system application confirm the match.
276566 PP-1 Dash Control Valve
This hand-operated PP-1 valve lists a 20-psi automatic pressure release, a 1/8-inch NPT supply port, two 1/8-inch NPT delivery ports, a 1/8-inch NPT exhaust port, and a 3/8-inch shaft. Listed cross-references include Bendix 276566 and several related numbers, along with Haldex, Midwest, Automann, Newstar, Keene, Euclid, and BWP references.
Best for: Buyers whose original valve matches the 276566 reference and listed specifications. The detailed port and release information makes this option easier to compare against an existing PP-1 valve.
Check before buying: The listing asks buyers to confirm the original PP-1 specifications. Do not choose it based only on a similar appearance or a partially matching cross-reference.
Saihisday Parking And Air Brake Knobs
This set contains yellow and red air-brake knobs identified as 298818N and 298817N. The listing describes them as replacements for threaded push-pull valves and names references for Bendix, Euclid, and Meritor. The knobs are described as plastic and wear-resistant.
Best for: Buyers who need replacement knobs rather than a complete parking brake valve. It is included because a damaged or missing knob may be the part being replaced, while the valve body remains in place.
Check before buying: This is a knob set, not a complete valve. Match the knob’s part number and thread arrangement to the existing valve before ordering.
Buying Guide: How To Choose A Semi Parking Brake Valve
How do I match the replacement part?
Start with the part number printed on the existing valve or its identification label. Compare the full number, including suffixes such as N or X, with the replacement listing. Cross-reference lists can help narrow options, but they do not replace confirming the required part and specifications.
Which valve specifications should I compare?
Check the valve type, port sizes and thread type, number of delivery ports, release pressure when specified, and shaft or knob details. For example, the 276566 listing states a 20-psi automatic release and 1/8-inch NPT ports. The 110170 listing instead specifies 3/8-inch supply and control ports, so the two products should not be treated as interchangeable based on general brake-valve wording.
Do I need a valve or only a knob?
Choose a complete valve when the valve itself is the required replacement and the part number and configuration match. Choose a knob-only product when the existing valve is being retained and the knob reference and attachment match. The Saihisday listing is for knobs, while the KN20021 and PP-1 listings describe valves.
What should I verify before installation?
Confirm the replacement application and specifications with the original part information and applicable vehicle or service documentation. Because these products concern air-brake controls, do not rely on appearance alone. If the correct part or installation requirements are uncertain, consult a qualified commercial-vehicle technician.
Frequently Asked Questions
What does a semi-truck parking brake valve do?
A parking brake valve is a driver-operated air-brake control. The exact function and configuration depend on the valve and vehicle system, so match the replacement to the original part and application.
Can a 276566 valve replace a 276567 valve?
Do not assume they are interchangeable. The listings identify different part numbers and the 276566 listing specifies particular ports and release pressure. Verify the correct number and specifications for the existing valve.
Are parking brake knobs sold as complete valves?
No. The Saihisday product is described as a set of replacement knobs. It does not include a complete valve according to the supplied product information.
What does NPT mean in a valve listing?
NPT identifies a pipe-thread specification. Compare the listed thread type and port size with the original valve rather than assuming a port will fit because its diameter appears similar.