Master cylinder Brake Volvo Amazon 1-Circuit (B18)

A sinking pedal, a falling fluid level or a soft brake after winter storage often points to a worn master brake cylinder. On the 122 with B18 and a single-circuit system it is extra important to keep an eye on the seals – with only one hydraulic circuit an internal or external leak means the entire braking action can be lost at once, not just front or rear.