RIDEX Front Right Brake Caliper – MX-5 Mk3 NC 1.8 / 2.0 • 78B1239

RIDEX Front Right Brake Caliper – 78B1239

Brand-new replacement front right brake caliper for Mazda MX-5 Mk3 / NC, Mk3.5 / NC-FL and Mk3.75 / NC-FL2 1.8 and 2.0 MZR petrol models (2005–2015) fitted with the corresponding front braking system.

RIDEX 78B1239 is a single-piston floating brake caliper designed for the front right-hand side of the vehicle, corresponding to the driver's-side front wheel on UK right-hand-drive Mazda MX-5 models.

The brake caliper is an essential part of the hydraulic braking system. When the brake pedal is pressed, hydraulic pressure moves the caliper piston, bringing the brake pads into contact with the rotating brake disc to generate friction and slow the vehicle.

The front brakes perform a substantial proportion of the vehicle's braking work and must withstand repeated hydraulic loading, frictional forces and high temperatures during normal driving.

Over time, brake calipers can deteriorate through corrosion, damaged piston seals, worn protective dust boots and restricted movement of the caliper's sliding mechanism.

A sticking or seized front brake caliper can prevent the brake pads from releasing correctly, resulting in brake drag, excessive heat, uneven pad wear and accelerated brake disc deterioration.

Damaged hydraulic seals may also cause brake fluid leakage, reducing braking performance and requiring replacement of the affected components.

RIDEX 78B1239 provides a brand-new replacement caliper manufactured from cast iron and incorporating a 54mm hydraulic piston.

The caliper uses a floating design, allowing braking force to be applied through both pads against the front brake disc.

It is designed for the SUMITOMO-type front braking system fitted to compatible Mazda MX-5 NC models, using 289mm diameter ventilated front brake discs with a nominal thickness of 22mm.

The 127mm mounting bore spacing corresponds to the relevant front brake caliper mounting arrangement.

Replacing a worn or seized original caliper can help restore correct brake application and release, supporting consistent braking performance and even pad wear.

Unlike a remanufactured or reconditioned brake caliper, this RIDEX component is supplied brand new, providing a fresh replacement for front braking system repairs and refurbishment.

The product is suitable for Mazda MX-5 NC1, NC2 and NC3 models equipped with the corresponding standard front brakes, including compatible 1.8 and 2.0 petrol variants.

Key Features & Benefits

• Brand-new replacement front right brake caliper
• Suitable for Mazda MX-5 Mk3 / NC 1.8 and 2.0 petrol models
• Compatible with NC1, NC2 and NC3 generations
• Front right-hand installation – UK driver's side
• SUMITOMO-type braking system
• Single-piston floating caliper design
• 54mm hydraulic piston diameter
• Durable cast-iron construction
• Designed for 289mm ventilated front brake discs
• Compatible with 22mm nominal disc thickness
• 127mm mounting bore spacing
• Suitable for replacing seized, leaking or damaged original calipers
• Brand-new construction – not remanufactured or reconditioned
• Replacement for Mazda OE reference NFZ7-33-98Z

Product Specifications

• Product type: Front brake caliper
• Fitting position: Front axle, right-hand side
• UK vehicle position: Front driver's side
• Brake system: SUMITOMO
• Caliper design: Single-piston floating caliper
• Piston diameter: 54mm
• Material: Cast iron
• Compatible brake disc diameter: 289mm
• Compatible brake disc thickness: 22mm
• Mounting bore spacing: 127mm
• Vehicle compatibility: Mazda MX-5 Mk3 / NC, Mk3.5 / NC-FL and Mk3.75 / NC-FL2
• Engine compatibility: 1.8 and 2.0 MZR petrol
• Quantity supplied: 1 front right brake caliper
• Condition: Brand new
• Brand: RIDEX
• Manufacturer Part Number: 78B1239
• EAN: 4064138381772
• Genuine Mazda OE Reference: NFZ7-33-98Z

Fitment Advice: Suitable for the front right-hand side of Mazda MX-5 Mk3 / NC 1.8 and 2.0 petrol models equipped with the corresponding SUMITOMO-type front braking system using 289mm ventilated brake discs. The caliper is intended for the original brake mounting configuration rather than aftermarket big-brake conversions.

Important: This is a front right-hand brake caliper supplied individually. The matching front left-hand RIDEX brake caliper is part number 78B1033.

Signs of a Failing Brake Caliper: Brake drag, uneven brake pad wear, a sticking or seized piston, excessive heat from one front wheel, hydraulic fluid leakage, abnormal braking noise or the vehicle pulling to one side during braking.

Other Items to Consider: Front brake discs, front brake pads, brake caliper mounting hardware, slider pins, flexible brake hoses, brake fluid and suitable brake cleaning products.

Useful Tools / Consumables: Vehicle lifting equipment, axle stands, socket and spanner set, brake hose tools, calibrated torque wrench, brake bleeding equipment, brake fluid collection container and suitable brake cleaner.

Difficulty Guide: Moderate to Advanced. Installation requires removal of the original brake caliper, disconnection and reconnection of the hydraulic brake system and correct bleeding of the brakes. Professional installation is recommended.

Why RIDEX? RIDEX supplies aftermarket braking and vehicle maintenance components designed for the replacement of worn or damaged original parts. The 78B1239 front right brake caliper offers a brand-new replacement solution for compatible Mazda MX-5 NC braking systems.

What's in the Box: 1x RIDEX 78B1239 Front Right Brake Caliper.

Installation / Service Notes: Follow the applicable Mazda front brake caliper replacement procedure. Safely raise and support the vehicle before removing the front right wheel. Inspect the existing brake caliper, disc, pads, flexible brake hose, mounting components and associated braking hardware for wear or damage. Disconnect the hydraulic brake hose using suitable tools and collect any escaping brake fluid. Remove the original caliper and inspect the mounting components for corrosion, damage or excessive wear. Clean the mounting areas and install the replacement RIDEX caliper using the corresponding brake hardware and manufacturer-specified tightening torques. Reconnect the brake hose using the correct sealing arrangement, ensuring it is not twisted or placed under tension. Install compatible brake pads and ensure the caliper operates freely within its mounting arrangement. Fill and bleed the hydraulic braking system using brake fluid meeting Mazda's specified requirements. Inspect all hydraulic connections for leaks and confirm that the caliper applies and releases correctly. Restore normal brake pedal travel before moving the vehicle. Refit the wheel and tighten the wheel nuts to the prescribed torque. Carry out a controlled road test and final braking system inspection to ensure satisfactory operation.