MCP Dual Piston Brake Caliper

When it comes to quarter midget braking, the MCP 650QB is one of the most widely used calipers in the sport. Lightweight, reliable, and built specifically for the demands of youth racing, this black anodized billet aluminum dual piston caliper delivers consistent, confidence-inspiring stopping power race after race.

The 650QB is the black anodized version of the popular MCP 650Q — same proven internals and performance, with a sleek black finish. It fits the majority of quarter midget chassis on the market today, making it a go-to choice for builders, crew chiefs, and parents setting up new cars or replacing worn components.

Dual pistons provide even, balanced clamping force across the rotor, which translates to straight, predictable braking without pull or fade. The included AN-3 straight fitting makes for a secure, leak-resistant brake line connection, and the 5/16" mounting holes align with standard QM brake mount configurations.

Important: This caliper is designed for use with DOT 5 silicone brake fluid only. Do not substitute DOT 3 or DOT 4 fluid.

Chassis Compatibility Note: Fits most quarter midget chassis. Not compatible with ARC Quarter Midget Race Cars.

Specs at a Glance:

• SKU: 650QB
• Configuration: Dual piston
• Construction: Billet aluminum, black anodized
• Fitting: AN-3 straight
• Mounting: 5/16" holes
• Brake Fluid: DOT 5 silicone only
• Rotor Thickness Range: 0.125" – 0.250"
• Fits: Most quarter midget chassis (excluding ARC)
• Equivalent to: MCP 650Q (natural finish version)

MCP Racing has been the dominant name in quarter midget and kart braking for decades. Their calipers are found on cars at every level of competition — from first-year rookies to national championship contenders.