SCITOO 18B4921 Rear Left Disc Brake Caliper Assembly - Direct Fit

In this review of the SCITOO 18B4921 rear left disc brake caliper assembly, the bottom line is simple: it is a direct-fit replacement for 2005-2007 Ford F-250 and F-350 Super Duty trucks that aims to restore rear braking function with minimal fuss. Designed as a rear driver side caliper with an included bracket and mounting hardware, this unit focuses on fit and straightforward installation. The reviewer found it most useful for owners who need a like-for-like OE interchange part and value a coated finish and phenolic pistons for corrosion resistance and durability.

Key Features

• Direct fit: Comes with a bracket and mounting hardware so it installs without modification on compatible 2005-2007 Ford Super Duty rear left positions.
• OE interchange: Matches OE number 18B4921 so it replaces the factory caliper and preserves factory alignment and braking geometry.
• Piston design: Two 48mm phenolic pistons reduce heat transfer and resist corrosion, which helps maintain consistent braking performance.
• Durable finish: Zincification coating and multiple tests improve corrosion resistance for longer service life in harsh conditions.
• Brake port sizing: Standard 3/8 x 24 inlet and bleeder ports make hose and bleed fitting connections straightforward for mechanics.

Who It's For

This caliper is best for owners of 2005-2007 Ford F-250 and F-350 Super Duty trucks who need a rear left driver side replacement that maintains factory specifications. It suits DIY mechanics and professional shops that prefer a caliper supplied with a bracket and hardware to reduce installation time.

Those driving other model years or vehicles outside the listed fitment should look elsewhere, as compatibility is specific to the 2005-2007 Super Duty range. If you require a caliper with integrated pads or a different piston material, pick a unit that lists those features explicitly.

Pros & Cons

Pros

• Direct-install bracket and hardware make replacement quick and reduce the chance of fitment issues.
• Piston material and zincified finish contribute to corrosion resistance and reliable performance in varied conditions.
• OE interchange number 18B4921 helps ensure correct fit for specified Ford Super Duty models.

Cons

• Some users report stickiness over time, which may require attention during installation or bedding in.
• A few customers noted concerns about mounting bolt quality, so double-check torque and hardware during fitment.

Specifications

Our Verdict

The SCITOO 18B4921 rear left caliper is a practical, value-oriented replacement for 2005-2007 Ford F-250 and F-350 Super Duty trucks that need a like-for-like OE swap. With phenolic pistons, a protective zincified finish, and included mounting hardware, it offers dependable performance for owners who want an economical, straightforward repair. Verify mounting bolt condition and follow proper installation torque to avoid the few reported issues.

Frequently Asked Questions

Will this caliper fit my 2006 Ford F-350?
Yes, this part is listed as compatible with 2005-2007 Ford F-350 Super Duty models for the rear left driver side position.

Does it come with a bracket and hardware?
Yes, the caliper is supplied with a bracket and mounting hardware to support direct installation.

What maintenance issues have been reported?
Some users noted stickiness developing and one reported mounting bolt concerns, so inspect hardware and perform proper bedding in after installation.