Master cylinder Brake Volvo 1800 (2-Circuit) (B18)

A leak in the early single-circuit cylinder meant total pressure loss and brake failure – that is exactly the weakness this dual-circuit solution from Wagner addresses on the B18 cars. The circuit split lets a front or rear circuit retain braking action even if the other springs a leak, which is clearly noticeable when restoring an older 1800 still running with the original system.