Master Cylinder / Brake Master Cylinder for auto

Brakes auto parts: Master Cylinder / Brake Master Cylinder

Master brake cylinder is one of the components of the hydraulic brake system. It serves to create the necessary pressure. Usually the master brake cylinder is two-space and has two separate chambers. Therefore, in the vehicle there are two independent brake gear circuits. This is very important for safety. When you press the brake pedal, the piston drives. When you release the pedal, the piston and the spring reset.

In the two-space cylinder there are used two pistons: primary and secondary. If one of two pistons fails, the brakes efficiency will decrease, but it will be enough to stop the car. A sudden decrease of braking efficiency indicates a problem with the master brake cylinder. Since the brakes are very important for safety, you should immediately visit the service centre. It is possible that the cylinder leaks and needs replacement.

In any case it is necessary to go to the service centre to repair or to replace the cylinder. Master brake cylinder directly affects the safety. To avoid serious consequences it is better that non-specialists not do replace the part by themselves. After replacement check the functionality of the brake system. To replace the old brake cylinder, use only new master brake cylinder from a safe car parts maker. To avoid unnecessary risks, old brake cylinders are not used for replacement. Do you search stabilizer, pulley, protective pipes, fuel level sender, door handle, guide rollers, water pump, heat exchanger or any other spare parts for your car? Visit our internet shop of car parts and you will be surprised at our low prices.

Malfunctions of main Brake Master Cylinder

  • seizure of piston;
  • seals have swollen;
  • tank cap vent valve is broken;
  • flexible hoses are swollen;
  • violation of tightness between the piston and the inner seal;
  • compensation port is blocked up;
  • seal in one of the circuits is damaged;
  • brake liquid is leaking in places of expansion tank connection.

Signs of main brake cylinder malfunctions

  • it is impossible to push brake pedal all the way down;
  • vehicle is skidding at braking;
  • brake pedal movement became too soft;
  • braking path has increased because of poor brake work;
  • brake pedal became too stiff;
  • brakes produce strange scraping noise, whistle and squeal.

Causes of main Brake Master Cylinder malfunctions

  • low-quality brake liquid is used;
  • pedal position is adjusted incorrectly;
  • inner piston seal is partly depressurized;
  • low-quality hoses are installed;
  • component was damaged as a result of mechanical impact;
  • car is used for driving on low-quality roads.

Diagnostics

When braking system is damaged, certain lights illuminate on the dashboard. In this case it is required to accomplish diagnostics of system elements. To begin with, have a visual inspection of main cylinder body. Check if braking liquid is leaking. Pay special attention to connection places of pipes and circuit outlets. Also, you need to make sure that the part was not damaged as a result of mechanical impact. Then, measure pressure in circuits. Manometer gage can help you with that. Connect it to pressure gage ports on circuit. After that, compare the received value with control value, which is specified in technical documents. For checking air tightness of main braking cylinder a specialized stand will be needed.  

Repair and replacement of main braking cylinder

For the part replacement, do the following actions:

  • disconnect the car electric system from the accumulator battery;
  • take off soundproof lining of the engine compartment, for this unscrew holding bolts and unfasten clamps;
  • disconnect the connector with cables from braking liquid level sensor;
  • loosen the 4 nuts, fixing braking pipes;
  • take off the broken cylinder from splint pins;
  • pour braking liquid into a new part;
  • place a reservoir with bushes on the new cylinder;
  • install the component.

After replacing the main cylinder, check if the brake pedal works correctly. In case of too soft pedal stroke, bleed air from the braking system.

Popular Master Cylinder / Brake Master Cylinder manufacturers
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  • Material: Cast Iron
  • Bore Ø [mm]: 19,05
  • Brake System: Bendix
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  • for article number: 6768
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  • Diameter 1/ Diameter 2 [mm]: 20,6
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  • Material: Aluminium
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  • Diameter [mm]: 22.2
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  • Diameter 1/ Diameter 2 [mm]: 17,5
  • Material: Grey Cast Iron
  • Brake System: ATE
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  • Diameter 1/ Diameter 2 [mm]: 23,8
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  • Material: Cast Iron
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  • Diameter [mm]: 19,05
In stock Details
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