Rear Disc Brake Calipers Assembly for Subaru Impreza & WRX - Durable

In this review of the SCITOO rear disc brake calipers assembly, the bottom line is simple: this pair is aimed at Subaru owners who need a direct-fit, cost-effective replacement for rear left and right calipers. It is best for mechanics or DIYers who want a ready-to-install solution with OE-style mounting brackets and straightforward hardware. The most compelling reason to choose these calipers is their focus on fit and direct installation, which lets most users replace both rear calipers without modifying the vehicle or sourcing extra components.

Key Features

• Direct fit: The assembly includes rear driver and passenger calipers with mounting brackets to allow quick installation without modification.
• OE interchange: The calipers use OE numbers 19B3425 and 19B3424 so they match the original parts for compatible Subaru models.
• Durable piston: A single metal piston with a 38mm diameter is used to provide consistent braking force under normal conditions.
• Service ports: Both the inlet and bleeder ports use M10 x 1.0 threads, matching standard brake fittings for easier hose and bleed line work.
• Protective finish: A white zincification coating helps resist corrosion and contributes to longer life in road conditions.
• Complete pair: The package contains two rear calipers so both sides can be replaced at once for balanced braking performance.

Who It's For

This product is well suited to owners of Subaru Impreza 2.5L and WRX 2.0L/2.5L model years listed in the fitment who prefer to install parts themselves or have a shop perform a like-for-like replacement. Enthusiasts who want an economical way to restore rear braking function without custom work will appreciate the included brackets and OE-style ports.

It is not the best choice for drivers who require rebuilt units with different piston materials or who need performance upgrades beyond stock replacement. Also, if a vehicle shows caliper sticking issues due to seized guides or damaged pads, a full inspection and possible additional components may be required.

Pros & Cons

Pros

• Good fit and compatibility with the specified Subaru Impreza and WRX models, reducing installation guesswork.
• Includes brackets and standard M10 x 1.0 ports so the assemblies install like OE parts.
• Metal piston and zincified finish improve durability and resist corrosion in routine use.
• Cost-effective way to replace both rear calipers at once for consistent braking performance.

Cons

• Some users report occasional stickiness, so careful inspection and proper bedding in are recommended after installation.
• A few buyers noted uneven bolt quality, so double-check mounting hardware and torque values during fitting.

Specifications

Placement on Vehicle	Rear Left and Right (Driver and Passenger)
Brake Piston Count	1 piston
Piston Diameter	38mm (1.5 in)
Inlet Port Size	M10 x 1.0
Bleeder Port Size	M10 x 1.0
Bracket	With bracket included
Finish	White zincification

Our Verdict

The SCITOO rear caliper pair is a pragmatic choice for Subaru Impreza and WRX owners who need a reliable, direct-replacement set with OE-style fitment and included brackets. It delivers good value and straightforward installation for those restoring rear braking; buyers should inspect for stickiness and verify mounting hardware during install, but for most users this is an effective, economical option.

Frequently Asked Questions

Do these calipers include both driver and passenger sides?
Yes, the package contains two rear calipers covering the driver and passenger sides with brackets.

Will the inlet and bleeder ports match my brake lines?
Both inlet and bleeder ports are M10 x 1.0, which match standard fittings for the listed Subaru models.

Are these calipers ready to install without modification?
They are designed for direct installation with mounting hardware and OE-style fit numbers, but always inspect bolts and perform proper bleeding and break-in procedures.