RIDEX Rear Left Brake Caliper – MX-5 Mk1 NA / Mk2 NB Standard Brakes • 78B0937

RIDEX Rear Left Brake Caliper – 78B0937

Brand-new replacement rear left brake caliper for Mazda MX-5 Mk1 / NA 1.6 and 1.8, Mk2 / NB 1.6 and 1.8, and Mk2.5 / NB-FL 1.6 and 1.8 petrol models (1990–2005) fitted with the corresponding standard rear braking system.

RIDEX 78B0937 is a cast-iron rear brake caliper designed for installation on the left-hand side of the rear axle, corresponding to the passenger-side rear wheel on UK right-hand-drive Mazda MX-5 models.

The brake caliper is an essential part of the vehicle's braking system, converting hydraulic pressure into the mechanical force required to press the brake pads against the brake disc.

When the brake pedal is pressed, hydraulic pressure moves the caliper piston, applying the brake pads to the rotating disc and generating friction to slow the vehicle.

The rear brake caliper also incorporates an integrated mechanical parking brake mechanism, allowing the rear braking system to hold the vehicle securely when the handbrake is applied.

During everyday driving, rear brake calipers are subjected to repeated braking forces, changing temperatures, road moisture, dirt and corrosion. Over time, these conditions can affect the caliper piston, hydraulic seals, sliding mechanism and parking brake operation.

A sticking or seized rear caliper can cause brake drag, excessive heat, uneven pad wear and accelerated deterioration of the rear brake disc.

Worn piston seals or damaged hydraulic components may also allow brake fluid to escape, reducing the braking system's effectiveness and requiring replacement of the affected components.

RIDEX 78B0937 provides a brand-new replacement caliper incorporating a 32mm hydraulic piston within a durable cast-iron housing.

The caliper features an integrated mechanical handbrake mechanism and is designed for the corresponding standard rear braking system using 9mm-thick solid brake discs.

With 124mm mounting bore spacing, the caliper is designed to fit the relevant Mazda rear brake mounting arrangement using the compatible original caliper carrier.

Unlike a remanufactured or reconditioned unit, this RIDEX brake caliper is supplied brand new, making it a practical replacement when repairing or refurbishing an ageing braking system.

The caliper is suitable for selected Mazda MX-5 Mk1 / NA, Mk2 / NB and Mk2.5 / NB-FL models with standard rear brakes. Vehicles equipped with the larger Mk2.5 Sport rear braking system use different calipers.

Key Features & Benefits

• Brand-new replacement rear left brake caliper
• Suitable for compatible Mazda MX-5 Mk1 / NA and Mk2 / NB models
• Rear left installation – UK passenger side
• Single-piston hydraulic brake caliper
• 32mm brake caliper piston diameter
• Integrated mechanical parking brake mechanism
• Durable cast-iron construction
• Designed for standard rear brakes with 9mm-thick solid discs
• 124mm caliper mounting bore spacing
• Suitable for replacing seized, leaking or damaged original rear calipers
• Brand-new construction – not remanufactured or reconditioned
• Direct replacement for corresponding Mazda rear left caliper applications

Product Specifications

• Product type: Rear brake caliper
• Fitting position: Rear axle, left-hand side
• UK vehicle position: Rear passenger side
• Caliper design: Single-piston caliper with integrated parking brake
• Piston diameter: 32mm
• Material: Cast iron
• Compatible brake disc thickness: 9mm
• Mounting bore spacing: 124mm
• Mounting carrier: Not included
• Vehicle compatibility: Mazda MX-5 Mk1 / NA, Mk2 / NB and Mk2.5 / NB-FL with corresponding standard rear brakes
• Quantity supplied: 1 rear left brake caliper
• Condition: Brand new
• Brand: RIDEX
• Manufacturer Part Number: 78B0937
• EAN: 4059191904310

Fitment Advice: Designed for the rear left-hand side of Mazda MX-5 Mk1 / NA and Mk2 / NB models using the corresponding standard rear brake caliper arrangement. This includes original 1.6 and 1.8 applications with compatible 9mm-thick rear brake discs. The larger 276mm Mk2.5 Sport rear braking system uses a different caliper.

Important: This product is supplied as one rear left brake caliper without its mounting carrier. The matching RIDEX rear right brake caliper is part number 78B1063.

Signs of a Failing Rear Brake Caliper: A sticking or seized caliper piston, brake fluid leakage, excessive brake drag, uneven rear brake pad wear, unusual heat from one rear wheel, reduced braking performance or poor handbrake operation.

Other Items to Consider: Rear brake discs, rear brake pads, brake caliper carriers, slider pins, rear flexible brake hoses, brake fluid, handbrake cable components and associated mounting hardware.

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 cleaning products.

Difficulty Guide: Moderate to Advanced. Installation involves removing the original caliper, disconnecting and reconnecting the hydraulic brake system, connecting the handbrake mechanism and bleeding and adjusting the rear 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 78B0937 offers a brand-new rear brake caliper with an integrated parking brake mechanism, providing a practical alternative to rebuilding an ageing original caliper.

What's in the Box: 1x RIDEX 78B0937 Rear Left Brake Caliper with integrated parking brake mechanism. Supplied without the caliper mounting carrier.

Installation / Service Notes: Follow the applicable Mazda rear brake caliper replacement procedure. Safely raise and support the vehicle before removing the rear left wheel. Release the parking brake and inspect the existing brake caliper, disc, pads, flexible brake hose, mounting carrier and handbrake cable for wear or damage. Disconnect the parking brake cable from the caliper as required and carefully disconnect the hydraulic brake hose, collecting any escaping brake fluid. Remove the original caliper and inspect the reusable mounting carrier, slider components and mounting hardware. Clean the mounting surfaces and install the replacement caliper using the appropriate hardware and manufacturer-specified tightening torques. Reconnect the flexible brake hose using the correct sealing arrangement and refit the parking brake cable. Install compatible brake pads and confirm that the caliper operates freely. Refill and bleed the braking system using the brake fluid specified by Mazda. Set the rear brake piston and parking brake adjustment using the appropriate workshop procedure. Inspect all hydraulic connections for leaks and ensure the brakes apply and release 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 followed by a final brake system inspection.