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1978-1982 Corvette C3 Brake Line Proportioning Valve 1257208

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Item ID: 603-571
GM Part #: 1257208
Availability: In Stock - Ships today if ordered by 3 PM CT
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Fits Years:
  • 1978-1982
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  • Description

1978-1982 C3 Brake Line Proportioning Valve 1257208 - OEM Number(s) (1257208)

OE-Style Brake Line Proportioning Valve for Proper Front-to-Rear Brake Bias
Restore confident braking performance to your 1978–1982 Corvette with this direct-fit brake line proportioning valve. Designed to deliver the correct pressure balance between front and rear brakes, this replacement valve plays a critical role in ensuring consistent, safe stopping under all conditions.

Built to original equipment specifications, this valve regulates hydraulic pressure to help prevent rear wheel lock-up and maintain straight-line braking. Whether you're replacing a leaking unit or correcting inconsistent pedal feel, this part helps your C3 stop the way it was engineered to—smooth, safe, and predictable.

Features
• Fits 1978–1982 C3 Corvettes
• OE-style replacement—restores factory brake bias performance
• Controls brake line pressure from master cylinder to rear brakes
• Helps prevent rear brake lock-up and preserves braking control
• Direct fit—no modification required
• Cast body with correct port locations and fittings

Dimensions and Weight
• Application: 1978–1982 Corvette C3
• Function: Brake line pressure proportioning (front-to-rear bias)
• Part Number: 1257208
• OE Replacement

Because Details Matter
Proper brake line pressure distribution is essential to safe Corvette operation. This proportioning valve keeps your late C3’s brake system balanced and responsive—exactly as the factory intended.

Also known under these part numbers: (For reference only)

  • 036666621129
  • 1257208
  • 28981
  • 53329
  • LS233N