AC Industries Master Cylinder | VW Beetle, Ghia & Thing 1949–77 | 20.6mm Dual-Circuit (113611020BAD)

AC Industries Dual-Circuit Master Cylinder — 20.6mm Big Bore, 4-Wheel Disc (113611020BAD)

AC Industries ambidextrous dual-circuit master cylinder for four-wheel disc brake conversions. The 20.6mm big bore moves the extra fluid volume a full disc system needs, and the ambidextrous design works on both left- and right-hand-drive cars — outlet ports on both sides let you mount it on either side of the chassis.

Vehicle Fitment

For four-wheel disc brake setups. Does not fit Super Beetle — for ’71–’79 Super Beetle four-wheel disc, use #113611020BHD instead.

• VW Beetle: 1949–1977
• VW Karmann Ghia: 1949–1977
• VW Type 181 (Thing): 1949–1977

Key Features & Benefits

• Dual-circuit, 20.6mm big bore: moves the fluid volume a four-wheel disc system needs.
• Ambidextrous: works for both left- and right-hand drive.
• Dual-side outlet ports: mount on either side of the chassis.
• Includes four threaded plugs: to seal the unused ports.

Technical Specifications

• Part Number: 113611020BAD
• Bore: 20.6mm big bore
• Circuit Type: Dual circuit
• Steering: Ambidextrous (LHD & RHD)
• Application: Four-wheel disc brakes
• Included: Four threaded plugs for unused ports

Frequently Asked Questions

• Does it fit a Super Beetle? No — for ’71–’79 Super Beetle four-wheel disc, use #113611020BHD instead.
• Does it work on right-hand-drive cars? Yes — the ambidextrous design and dual-side outlet ports support both LHD and RHD.
• Is a reservoir included? No — it pairs with top-mount dual-circuit brake fluid reservoir #251611301V (sold separately), or buy the combo #113698020K.

Explore Related Categories

Brakes · VW Beetle · VW Karmann Ghia