Which flare styles are permitted for steel brake lines?

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Multiple Choice

Which flare styles are permitted for steel brake lines?

Brake-line flare styles must match the fittings so the seal can hold hydraulic pressure without leaking. For steel brake lines, the two standard, accepted flare profiles used in automotive practice are the SAE 45-degree flare and the ISO 45-degree flare. Both are designed to seat properly with their corresponding nuts and seating surfaces, delivering a reliable, leak-tight connection under brake-system pressure. Using either of these styles ensures compatibility with the vehicle’s brake fittings and hoses. Nonstandard flare styles or mixing styles can leave gaps or cause leaks. That’s why the permitted set includes both ISO and SAE.

Brake-line flare styles must match the fittings so the seal can hold hydraulic pressure without leaking. For steel brake lines, the two standard, accepted flare profiles used in automotive practice are the SAE 45-degree flare and the ISO 45-degree flare. Both are designed to seat properly with their corresponding nuts and seating surfaces, delivering a reliable, leak-tight connection under brake-system pressure. Using either of these styles ensures compatibility with the vehicle’s brake fittings and hoses. Nonstandard flare styles or mixing styles can leave gaps or cause leaks. That’s why the permitted set includes both ISO and SAE.

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