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Home Mercedes-Benz Master Cylinder And Parts

Mercedes-Benz Master Cylinder And Parts

No matter which type of braking system is at work in your Mercedes-Benz vehicle, it depends on the master brake cylinder. What it does is simple.

How a Mercedes-Benz Master Brake Cylinder Works

First, you depress the brake pedal. That pedal pushes a piston through the master brake cylinder, which in turn forces brake fluid through brake lines and hoses to cylinders -- called slave cylinders, unfortunately -- at each wheel. Those cylinders drive pistons to force the friction material against the wheel hubs, which causes the wheels to stop rotating.

That friction material differs by braking system, though.

Disc Brakes

In this set-up, the brake calipers press brake pads against the brake rotors.

Drum Brakes

This type fastens the brake shoes to the brake drums to create the resistance needed to slow the wheels.

How to Spot A Faulty Master Cylinder

While your master cylinder is designed to last your car's full lifespan, it can go bad. If you don't keep the brake fluid reservoir filled, that's a sure way to experience issues. There are other ways it can fail, though, from fluid leaks to decayed seals and more. Signs of master brake cylinder trouble include:

  • Mushy-feeling brake pedal: If your brake pedal feels unusually soft underfoot, that's a sign that your master brake cylinder is having difficulty producing the hydraulic pressure needed for braking. The pedal sinking completely to the floor is a worst-case scenario.
  • Dirty-looking brake fluid: If your brake fluid looks exceptionally dark or dirty, the rubber seals on the master cylinder may have failed. That allows corrosion to set in, affecting the master cylinder, lines, and other components.
  • The "Check Engine" light comes on: While this is a generic warning that requires connecting a code reader to properly diagnose, it may come as a surprise that a faulty master cylinder can trigger this alert. That's because newer models come with sensors in the master cylinder. If they detect a problem, they can cause both the brake warning light and your engine lights to engage.

    • Buy Genuine Mercedes-Benz Master Cylinder Parts Online for Guaranteed Compatibility

    Your manufacturer makes the only master cylinders and parts that are designed specifically for your model. Find them in our online parts catalog, complete your order, and you'll have your issue resolved in no time. Too big a project for you to tackle? Take your Mercedes-Benz vehicle to your local dealership and let the expert mechanics there take care of it!

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    123420672864 - : Line for Mercedes-Benz: 190C, 190DC, 200, 200D, 220b, 220Sb, 250S, 250SE, 260E, 280E, 300CE, 300D, 300E, 300SL, 300TD, 300TE, 400E, 400SE, 400SEL, 450SEL, 500E, 500SEC, 500SEL, 500SL, 560SEC, 600, 600SEL, 600SL, CLS500, CLS55 AMG, CLS550, CLS63 AMG, S420 Image

    Line
    $62.00
    Mercedes-Benz of Stevens Creek
    Part Number: 123-420-67-28-64
    Mercedes-Benz Mercedes-Benz
    Positions: Left Rear
    Replaces: 123-420-67-28
    Description: From hydraulic unit to left front wheel. From master cylinder to coupling. Hydraulic unit conn. "fr" to right front wheel. Red 1175 mm....
    Notes: To be adapted during assemblyfor use without acceleration skid control (a s r). To be adapted during assemblynot for use with...
    Fits:
    • Mercedes-Benz:
      • 190C,
      • 190DC,
      • 200,
      • 200D,
      • 220b,
      • 220Sb,
      • 250S,
      • 250SE,
      • 260E,
      • 280E,
      • 300CE,
      • 300D,
      • 300E,
      • 300SL,
      • 300TD,
      • 300TE,
      • 400E,
      • 400SE,
      • 400SEL,
      • 450SEL,
      • 500E,
      • 500SEC,
      • 500SEL,
      • 500SL,
      • 560SEC,
      • 600,
      • 600SEL,
      • 600SL,
      • CLS500,
      • CLS55 AMG,
      • CLS550,
      • CLS63 AMG,
      • S420
    123420752864 - : Line for Mercedes-Benz: 180C, 200D, 220D, 230, 240D, 280, 280CE, 280E, 300SD, 300SL, 300TE, 400SE, 400SEL, 500SEC, 500SEL, 600SEL, C230, C240, C280, C32 AMG, C320, C350, C55 AMG, CLK320, CLK350, CLK500, CLK55 AMG, E430, S420 Image

    Line
    $79.00
    Mercedes-Benz of Stevens Creek
    Part Number: 123-420-75-28-64
    Mercedes-Benz Mercedes-Benz
    Positions: Right Rear
    Other Names: Supersession Dummy
    Replaces: 123-420-75-28, 124-420-35-28, 129-420-25-28, 140-420-12-28, 203-420-48-26
    Description: From hydraulic unit to right front wheel. From master cylinder to rear hydraulic unit.
    Notes: To be adapted during assemblyonly for australia code 625for use without acceleration skid control (a s r).
    Fits:
    • Mercedes-Benz:
      • 180C,
      • 200D,
      • 220D,
      • 230,
      • 240D,
      • 280,
      • 280CE,
      • 280E,
      • 300SD,
      • 300SL,
      • 300TE,
      • 400SE,
      • 400SEL,
      • 500SEC,
      • 500SEL,
      • 600SEL,
      • C230,
      • C240,
      • C280,
      • C32 AMG,
      • C320,
      • C350,
      • C55 AMG,
      • CLK320,
      • CLK350,
      • CLK500,
      • CLK55 AMG,
      • E430,
      • S420
    123420782864 - : Line for Mercedes-Benz: C220, C230, C280, C43 AMG, G55 AMG, G550, G63 AMG, G65 AMG Image

    Line
    $80.00
    Mercedes-Benz of Stevens Creek
    Part Number: 123-420-78-28-64
    Mercedes-Benz Mercedes-Benz
    Positions: Left Rear
    Other Names: Supersession Dummy
    Replaces: 107-420-95-28, 107-420-95-28-64, 123-420-78-28, 202-420-67-28
    Description: Between coupling piece and bracket, frame. 4.75x0.7x2740 mm. From master cylinder,connection "v",to hydraulic unit,connection: "v"....
    Notes: To be adapted during assemblyonly for 202.
    Fits:
    • Mercedes-Benz:
      • C220,
      • C230,
      • C280,
      • C43 AMG,
      • G55 AMG,
      • G550,
      • G63 AMG,
      • G65 AMG
    123420852864 - : Line for Mercedes-Benz: 190C, 190DC, 220b, 220Sb, 250S, 250SE, 380SEC, 450SE Image

    Line
    $115.00
    Mercedes-Benz of Stevens Creek
    Part Number: 123-420-85-28-64
    Mercedes-Benz Mercedes-Benz
    Replaces: 123-420-85-28
    Description: From master cylinder to brake pressure regulator. 4.75x0.7x3450 mm. From rear master cylinder to distributor. 4.75x0.7x3450 mm. From...
    Notes: To be adapted during assemblynot for use with mercedes-benz hydraulic-automatic clutch. To be adapted during assembly000,001,010 from...
    Fits:
    • Mercedes-Benz:
      • 190C,
      • 190DC,
      • 220b,
      • 220Sb,
      • 250S,
      • 250SE,
      • 380SEC,
      • 450SE
    123420862864 - : Line for Mercedes-Benz: 280S, 280SE, 300E, 300SE, 300TE, 380SE, 450SE, 450SEL, 500SEC, C220, C280, C43 AMG, S430, S55 AMG Image

    Line
    $66.00
    Mercedes-Benz of Stevens Creek
    Part Number: 123-420-86-28-64
    Mercedes-Benz Mercedes-Benz
    Positions: Right Rear, Left Rear, Rear
    Other Names: Supersession Dummy
    Replaces: 123-420-86-28, 124-420-49-28, 124-420-50-28
    Description: From adapter fitting to brake hose, rear right. From adapter fitting to brake hose, rear left bosch. From adapter fitting to distributor.
    Notes: To be adapted during assemblyup to ident no. To be adapted during assemblywith single-piece brake line,the line from the hydraulic unit...
    Fits:
    • Mercedes-Benz:
      • 280S,
      • 280SE,
      • 300E,
      • 300SE,
      • 300TE,
      • 380SE,
      • 450SE,
      • 450SEL,
      • 500SEC,
      • C220,
      • C280,
      • C43 AMG,
      • S430,
      • S55 AMG
    123420882864 - : Line for Mercedes-Benz: 190E, 250S, 250SE, 260E, 280E, 300SD, 300SL, 400SE, 400SEL, 450SEL, 500SEC, 500SEL, 500SL, 600SEL, 600SL, CLS500, CLS55 AMG, CLS550, CLS63 AMG, E420, E430, S420, SL320 Image

    Line
    $95.00
    Mercedes-Benz of Stevens Creek
    Part Number: 123-420-88-28-64
    Mercedes-Benz Mercedes-Benz
    Positions: Right Rear, Left Rear
    Replaces: 123-420-88-28, 211-420-65-26
    Description: From adapter fitting to brake pressure regulator. 4.75 x 0.7 x 3865 mm. From front master cylinder to distributor. 4.75 x 0.7 x 3865 mm....
    Notes: To be adapted during assemblyup to ident no. To be adapted during assembly012 up to chassis 006389. 014 up to chassis 003997. 015 up to...
    Fits:
    • Mercedes-Benz:
      • 190E,
      • 250S,
      • 250SE,
      • 260E,
      • 280E,
      • 300SD,
      • 300SL,
      • 400SE,
      • 400SEL,
      • 450SEL,
      • 500SEC,
      • 500SEL,
      • 500SL,
      • 600SEL,
      • 600SL,
      • CLS500,
      • CLS55 AMG,
      • CLS550,
      • CLS63 AMG,
      • E420,
      • E430,
      • S420,
      • SL320
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