Air can enter through an opening in a rubber seal around a caliper piston, or a junction in a brake line.If no fluid is present, air will be drawn inside of the lines instead. When the brake pedal is pushed, the master cylinder creates a suction inside of the reservoir to keep the optimum amount of brake fluid inside the lines. Step 1 – Air is mixing with the brake fluidĪir compresses in place of the non-compressible brake fluid, creating a soft brake pedal.Īir can mix with the brake fluid for a number of reasons: The steps are listed from most likely to occur to least likely. When a caliper has a seal failure, it may apply against the brake pad unevenly, creating uneven wear and improper pedal feel. The master cylinder and brake caliper both contain rubber seals that keep the fluid compressed. Moving parts in use with the brake system wear as well. Not only does dirt inside the system create problems, but dirt can create rust and corrosion on the brake lines routed to each wheel. When air, dirt, as well as moisture mix with brake fluid, the fluid becomes compressible and creates a soft brake pedal. When the pads contact the rotors, which move with the wheels, your vehicle begins to slow down. Inside of the calipers is a piston that applies pressure to the brake pads. When the master cylinder compresses from the brake pedal rod movement, fluid runs through the brake lines to the brake calipers. On top of the master cylinder is a reservoir containing the brake fluid. The brake pedal is attached to a rod that connects to the master cylinder. When you press down on the brake pedal, normally your Mercedes comes to a complete stop in a smooth manner with relatively minimal effort on your part. This article applies to the Mercedes-Benz C-Class w204 (2007-2014).
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