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What size are semi trailer air brake lines?

Semi-trailer air brake lines typically have a diameter of 1/2 inch (12.7 millimeters). This diameter provides a good balance between sufficient air flow capacity and ease of installation. Smaller diameter lines may restrict air flow and cause the brakes to be less effective, while larger diameter lines may be more difficult to install and take up more space.

The specific diameter of the air brake lines may also vary depending on the specific type of semi-trailer and the requirements of the air brake system. For example, some semi-trailers may use 3/8 inch (9.5 millimeters) diameter lines for the emergency brake circuit, while others may use 1/2 inch (12.7 millimeters) diameter lines for all circuits.

It is important to use the correct diameter air brake lines for your specific semi-trailer to ensure that the air brake system functions properly and safely. If you are unsure about the correct diameter of air brake lines for your semi-trailer, it is best to consult with a qualified mechanic or the manufacturer of the semi-trailer.

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