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3 Terminal Brake Light Switch

This 3-pin hydraulic brake light switch is a direct replacement for many classic Volkswagen and Porsche models, used to activate the brake lights when hydraulic pressure builds in the braking system. It screws directly into the master cylinder and operates automatically when the brake pedal is pressed.

Unlike mechanical switches, this hydraulic switch responds to brake fluid pressure, ensuring reliable brake light activation even under light pedal input. The 3-pin design is commonly used on later systems to provide additional circuit functionality, such as brake warning lights or dual-circuit monitoring.

A faulty brake light switch can cause brake lights not working, staying on permanently, or intermittent operation, making replacement essential for both safety and MOT compliance.


Product Details

  • Operating Mode: Hydraulic
  • Thread Size: M10 x 1
  • Connections: 3-pin
  • Direct fit into master cylinder
  • Boot/gaiter available separately if required

Fitting & Installation Notes

  • Screws directly into the brake master cylinder
  • Some vehicles are fitted with two switches – replace like-for-like based on what is currently installed
  • Always check whether your vehicle uses a 2-pin or 3-pin switch before ordering
  • Brake fluid may be lost during installation – bleed system if required
  • Inspect wiring connectors for corrosion or poor contact
  • Recommended to replace:
    • Rubber protective boot (to prevent moisture ingress)
    • Brake fluid if contaminated
  • Do not overtighten – install to correct torque to avoid damaging threads

This switch is a critical safety component and should be replaced immediately if faulty.


Vehicle Fitment

Aircooled VW

  • VW Beetle / Cabriolet (1970–1979)
  • VW Baywindow Bus (1970–1979)
  • VW Karmann Ghia (1970–1974)
  • VW Type 3 (1970–1973)
  • VW Type 181 Trekker (1968–1983)
  • VW Buggy / Baja (1970–1979)

Watercooled VW

  • VW Type 25 / T3 (1979–1992) – petrol & diesel models
  • VW Golf Mk1 / Cabriolet (1975–1993)
  • VW Jetta Mk1 (1979–1983)
  • VW Scirocco Mk1 & Mk2 (1974–1992)
  • VW Passat B1 (1973–1981)

Porsche

  • Porsche 911 F-model – selected 2.0 models
  • Porsche 912
  • Porsche 924
  • Porsche 928
  • Porsche 930

This Part Fits: Beetle, Baywindow, Type 25, Karmann Ghia, Type 3, Trekker, Buggy, Mk1 Golf, Mk1 Golf Cabriolet, Splitscreen, Jetta, Scirocco, Porsche 911, Porsche 912, Porsche 924, Porsche 928, Porsche 930,

Availability: Stock Item

Item Name: Brake light switch, 3 pins

Description: Stop Light Switch

Product Group: Electric

Group: Signal System

Unit of Measure: Each

Manufacturer: JOPEX

Dimensions:

Width: 35mm

Height: 35mm

Depth: 60mm

Volume: 73500mm3

Weight: 0.07kg

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