Rear Disc Brake Caliper Assembly Kit for Lexus IS250 2006-2013 19-B3221 19-B3220 4785053051 4783053051 New Brake Set

This MXR aftermarket rear disc brake caliper kit includes one left and one right caliper for the Lexus IS250 applications listed below. Match both side-specific part references and your vehicle's brake configuration before ordering.

Supplier-Listed Fitment

• Lexus IS250, 2006–2009: supplier lists all models; confirm your vehicle's original caliper references and brake configuration.
• Lexus IS250 Base, 2010–2013: without Sport Suspension only.

Do not treat this as universal 2006–2013 IS250 fitment. Compatibility with 2010–2013 Sport Suspension models or other trims is not established. Verify by VIN, original part number, and suspension specification before purchase.

Package Contents

• 1 rear left brake caliper
• 1 rear right brake caliper
• Brackets and installation hardware: included according to the supplier; confirm the exact hardware supplied.

Installation instructions are not included. Brake pads, rotors, and brake hoses are not specified in the package list and should not be assumed included.

Side-Specific Part References

• Rear left: 19-B3221, 19B3221, 19-P3221, 19P3221, 4785053050, 4785053051
• Rear right: 19-B3220, 19B3220, 19-P3220, 19P3220, 4783053050, 4783053051

These are supplier-provided comparison references, not a claim of genuine Lexus manufacture or guaranteed interchangeability.

Supplier Specifications

• Brand: MXR
• Condition: Listed as new
• Installation position: Rear left and rear right
• Piston count: One piston per caliper
• Piston diameter: 1.69 in / 42.93 mm
• Piston material: Steel
• Caliper body: Cast iron, according to the specification section
• Bleeder port: M7 × 1.0
• Inlet port: Listed as 0.39, with no unit or thread specification supplied; confirm before ordering.
• Listed weight: 6,450 g
• Country of origin: China

The supplier's promotional text also mentions stainless steel, which conflicts with its cast-iron body specification. Confirm construction with the supplier if material requirements are important to your application.

Installation & Safety

Brake components are safety-critical. Professional installation is strongly recommended. Follow the vehicle manufacturer's service procedures for mounting, fastener torque, brake-fluid selection, bleeding, and leak checks. Verify correct operation before returning the vehicle to service.

No improved stopping distance, overheating prevention, or OEM-equivalent quality claim is made. The supplier advertises a two-year warranty, but eligibility and coverage terms must be confirmed before purchase. For fitment and warranty questions, contact support@samuraiautoparts.com.