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Replace a Spare part Master Cylinder (Brake Master Cylinder) – a defective one or if the limit of use has been already reached. Find out useful information about Master Cylinder (Brake Master Cylinder)

Master brake cylinder is the central element of the braking system, which converts the force applied to the brake pedal into the hydraulic pressure throughout the system. In the cylinder mainly operates the property of brake fluid, which is not compressed by external forces. Today in modern cars there is set two-piece master brake cylinder. And each of the sections should serve its own hydraulic circuit. In cars that have front-wheel drive, one of the units combines the brakes of the front right wheel and left rear wheel, while the second combines the left front and right rear wheels. In cars with rear-wheel drive there is another situation: the first circuit services the brakes of the front wheels, while the second the brakes of the rear wheels.

Master brake cylinder is mounted on the cover of the vacuum brake booster. Two-piece tank with some margin of brake fluid is located above the cylinder. Tank is connected to the sections of the cylinder through equalizing and drain ports. This part is necessary to compensate the fluid loss in the brake system. Gage marks on the transparent walls of the tank allow you to see the brake fluid level. It is the tank where the brake fluid level sensor is set up. When the brake fluid level is lower then it is necessary, on the instrument panel light up warning lights.

The most common breakage of the master brake cylinder is leak - when the smooth covering on the inner surface of the cylinder is broken. The cylinder begins to bypass the fluid, and the pedal smoothly goes to the floor under a uniform load. In modern cars master brake cylinder is a very reliable component and it rarely fails. But if you want to buy a new cylinder, online stores will always help to find exactly those spare parts that you need, such as cylinder bolts, distributor or brake pads.

Master Cylinder (Brake Master Cylinder) for OPEL MANTA A (58_, 59_), SUZUKI SAMURAI (SJ), VOLVO S80 I (TS, XY)

Faults of brake master cylinder
  • seizing of the piston;
  • swelling of the seals;
  • damage to the tank cap vent valve;
  • swelling of the flexible hoses;
  • break of tightness between the inner seal and the piston;
  • blockage of the compensation ports;
  • damage to the seal at one of the circuits;
  • liquid leakage from the reservoir in the joints.
Symptoms of the master cylinder faults
  • impossibility of the brake pedal movement for the entire stroke;
  • skidding during braking;
  • too soft stroke of the brake pedal;
  • poor braking;
  • excessively rigid brake pedal;
  • rattle, whistle or squeal during braking;
  • increase of braking distance.
Causes of the master cylinder faults
  • use of low-quality brake fluid;
  • improper adjustment of the pedal;
  • insufficient tightness of the inner piston seal;
  • installation of substandard hoses;
  • mechanical damage;
  • low quality road surface.
Diagnostics

First of all pay attention to the readings of control indicators on the dashboard. The appropriate indicator will alert you about malfunction of the braking system. The first step is an examination of the master cylinder body. It is important to detect the brake fluid lekage places, which can be both on pipe connections and at circuit outlets. Do not forget to identify mechanical damages. The next step is pressure measurement in the circuits. For this purpose, use the gauge which has to be attached to the holes on these devices. Now you need to compare the figures with the values, provided by the manufacturer. Whereas, you can determine whether the brake master cylinder is sealed properly only on a special stand.

Repair and replacement of the brake master cylinder

Carrying out the replacement you will have to perform a few steps:

  • disable the voltage from the battery;
  • remove the engine compartment acoustic trim (unscrew bolts and unfasten clamps);
  • disconnect the plug with the wires from the sensor indicating the brake fluid level;
  • loosen the four screws that hold the brake pipes;
  • remove the master cylinder from the pins (do not forget to pour all the liquid into the new cylinder);
  • mount a new reservoir with bushes on the new element;
  • install the master cylinder.

Be sure to check the correctness of the brake pedal performance after the replacement. If the pedal stroke is too "soft", you must bleed the brake system.

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