Master cylinder Brake Volvo 1800 (2-Circuit) (B20)

A pedal that slowly sinks toward the floor at a standstill, or uneven braking, usually points to leaking seals in the master brake cylinder. On the 1800 with B20, the two-circuit system arrived from model year 1969 (chassis #28300), meaning that a failure in one circuit still leaves braking on the other – an important difference from the earlier single-circuit cars.