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G4 Front Brake Disc (312mm Vented)

This replacement front brake disc is designed for vehicles fitted with the 312mm front brake setup, commonly found on higher-spec and performance-oriented models across the Mk4 platform. It is suitable for vehicles with PR code 1LJ (and related brake codes where specified), providing strong, consistent braking performance.

With a 312mm outer diameter and 25mm thickness, this is a vented brake disc, designed to manage heat effectively during repeated or heavy braking. The internal ventilation vanes draw cooling air through the disc as it rotates, helping to reduce brake fade and maintain stable braking performance—especially important on more powerful petrol models and heavier vehicles.

The disc is supplied with a protective anti-corrosion coating, helping to prevent rust during storage and after fitting, while allowing the braking surface to bed in correctly during normal use.

How it works

When the brake pedal is applied, the caliper clamps the pads against the rotating disc, converting the vehicle’s kinetic energy into heat through friction. The vented internal structure allows this heat to dissipate more efficiently than a solid disc, improving braking consistency and extending the life of both the disc and brake pads.

Fitting notes & recommended additional parts

  • Fitting position: Front axle (fits left and right)

  • Brake disc type: Vented

  • Specification: 312mm diameter × 25mm thickness

  • Fixing: 5-hole

  • Recommendation: Always replace front brake discs in pairs

  • Strongly recommended when fitting:

    • Front brake pads to suit 312mm discs

    • Pad fitting kit / anti-rattle springs

    • Brake cleaner for proper installation and bedding-in

New brake pads should always be fitted when replacing discs to ensure safe and effective braking.


Vehicle compatibility

  • VW Golf IV – PR codes 1LJ, 1ZR, E54, 1ZQ

  • VW Bora – PR code 1LJ

  • VW Jetta III

  • VW New Beetle – PR code 1LJ

  • VW Polo (9N) – selected 1.8 & 2.0 models

Important: Always confirm PR code and disc diameter before ordering, as multiple brake setups were used across these models.

This Part Fits: Mk4 Golf, Bora,

Availability: Stock Item

Item Name: Brake Disc

Description: Brake Disc

Product Group: Brakes

Group: Braking System

Unit of Measure: Each

Manufacturer: JP

Dimensions:

Width: 290mm

Height: 290mm

Depth: 95mm

Volume: 7989500mm3

Weight: 6.72kg

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