G4 Rear Brake Caliper (For 232mm Brake Discs) - Left (LUCUS)

This rear left brake caliper is a LUCAS single-piston floating caliper designed for Volkswagen vehicles fitted with 232mm solid rear brake discs. It is most commonly fitted to the VW Golf Mk4 (Golf IV) range and provides reliable, balanced rear braking performance when used as a direct replacement on vehicles with the correct PR codes.

Featuring a 38mm piston, this caliper delivers smooth and consistent pad application, supporting stable braking and effective handbrake operation when correctly installed and adjusted.

Primary Fitment – VW Golf Mk4 (1997–2014)

This caliper is primarily intended for the VW Golf Mk4, covering a wide range of petrol and diesel models that were factory-equipped with rear disc brakes using 232mm solid discs.

Fits VW Golf Mk4 with PR Codes 1KK or 1KS:

• 1.4 Petrol

• 1.6 Petrol

• 1.8 Petrol

• 2.0 Petrol

• 2.3 V5

• 1.9 Diesel (SDI / TDI)

PR codes are listed on the vehicle data sticker (service book or boot floor). Always confirm PR code and rear disc diameter before ordering, as Mk4 Golfs were also available with alternative rear brake setups.

Why This Caliper Is Used on the Mk4 Golf

On the Mk4 platform, rear disc brakes improve braking stability, reduce fade compared to drum systems, and offer better performance in wet conditions. The 232mm solid disc combined with this 38mm LUCAS caliper provides dependable stopping power for everyday driving without excessive complexity.

Other Compatible Volkswagen Models

This rear left brake caliper is also fitted to several other Volkswagen models sharing the same rear brake configuration:

VW New Beetle (1998–2010)

• Engines: 1.4, 1.6, 1.8, 2.0, 2.5 petrol and 1.9 diesel

• PR Codes: 1KS or 1KV

VW Polo 9N (2001–on)

• Engines: 1.4, 1.6 petrol and 1.9 diesel

• PR Codes: 1KK or 1KT

VW Polo 6R (2009–2022)

• Engines: 1.0, 1.2, 1.4, 1.6 petrol and diesel variants

• PR Codes: 1KK, 1KT or 2EJ

Brake specifications can vary by engine, year, and market—always verify PR codes before purchase.

How the Rear Brake Caliper Works

The rear brake caliper converts hydraulic brake pressure into mechanical force. When the brake pedal is pressed, fluid pressure pushes the 38mm piston outward, clamping the brake pads against the solid rear disc. This friction slows the rear wheels, helping stabilise the vehicle under braking and supporting overall braking balance.

As part of the rear braking system, this caliper also integrates with the vehicle’s handbrake mechanism, making correct installation and adjustment essential.

RHD Fitment Notes

• Fitting position: Rear axle left

• On right-hand-drive vehicles, this is the passenger side

Recommended Additional Parts

For best results and long-term reliability, we recommend fitting or checking:

• Rear brake pads

• 232mm solid rear brake discs

• Brake pad wear sensor (if fitted)

• New caliper carrier bolts (where specified)

Rear brake calipers should always be replaced in axle pairs to ensure even braking performance.

Key Specifications

• Fitting position: Rear axle left (RHD passenger side)

• Disc type: Solid

• Disc diameter: 232mm

• Disc thickness: 9mm

• Caliper type: Single-piston floating caliper

• Piston diameter: 38mm

• Manufacturer type: LUCAS