The brake system is fundamental to the safety of any vehicle, and Skoda Fabia 2 This is no exception. This model's rear brake mechanism is often paired with drum brakes, where the cylinder plays a key role in transferring hydraulic pressure to the pads. When this unit fails, the deceleration efficiency decreases, which creates a direct threat to the lives of the driver and passengers.
Many owners Skoda Fabia the second generation faces the problem of wear of the rubber seals inside the mechanism. Moisture, dirt and constant temperature changes destroy the material, leading to leakage of brake fluid or jamming of the pistons. Ignoring these signs can lead to complete failure of the brakes on the rear axle, which is especially dangerous during an emergency maneuver.
In this article, we will look in detail at how to recognize a malfunction, which parts are best to choose for replacement, and how to carry out repairs yourself without contacting service. Understanding of operating principles brake cylinder will allow you to save money and guarantee the reliability of your car for a long time.
Signs of a bad rear brake cylinder
The first and most obvious sign of a problem is a change in the behavior of the brake pedal. If you feel that the pedal sinks lower than usual or becomes soft, there may be an air lock in the system due to fluid leaking through a damaged cylinder.
Drivers often notice brake fluid leaks on the inside of the rear wheel rims or on the drums. Brake fluid is highly hygroscopic, so even a small spot quickly grows, collecting dust and dirt, forming a black slurry. This is a sure sign that O-rings The pistons have lost their tightness.
It is also worth paying attention to uneven wear on the rear brake pads. If one pad is worn significantly more than the other, this may indicate that the cylinder piston is not returning to its original position when the pedal is released. As a result, the pad is constantly pressed against the drum, causing overheating and rapid wear of the friction material.
Another symptom is the car spontaneously pulling to the side when braking. This happens because the pressure in one of the cylinders does not correspond to the other, or one of the mechanisms does not work at all. In that case Skoda Fabia 2 will pull towards the working brake, which requires immediate diagnosis.
Design features and selection of spare parts
On most versions Skoda Fabia 2 With rear drum brakes, a single-piston or double-piston cylinder is used, depending on the configuration and year of manufacture. The design includes anthers that protect the internal cavity from water and abrasive particles. It is these boots that most often tear, opening the way for corrosion to the cylinder bore.
When choosing a new part, it is important to understand the difference between original spare parts and high-quality analogues. Original cylinder from Skoda (VAG) guarantees a perfect match of all tolerances and materials, but costs significantly more. However, there are partner brands that produce components of the same specification, but under their own name.
- ๐ฉ๐ช TRW and ATE - German brands that often supply components to the assembly line, high quality and reliability.
- ๐ฎ๐น ATE and Textar - excellent alternatives with a good balance of price and quality for everyday use.
- ๐จ๐ณ Meyle is a time-tested brand that offers reinforced versions of parts for severe conditions.
Saving on the brake system is unacceptable. Cheap Chinese copies often have defects in the casting of the case or use low-quality rubber, which quickly hardens in the cold. Installing such a product can lead to repeated failure after just a few thousand kilometers, and the risk of brake failure increases many times over.
โ ๏ธ Attention! Be sure to check the part number before purchasing. On Skoda Fabia 2 Various cylinder modifications can be installed depending on the type of brake drum and piston diameter.
Pay special attention to the condition of the seat on the brake beam. If the old cylinder body is heavily oxidized, the new element may not fit tightly, which will lead to leakage even with a good gasket. In some cases, the landing area may need to be cleaned and treated prior to installation.
- Drums
- Disk
- I don't know
- They're not there
Step-by-step instructions for replacing the cylinder
Replacing a rear brake cylinder is a moderately difficult task that can be done in a garage with a basic set of tools. You will need spanners, a jack, wheel chocks, and a container to drain the old brake fluid. It is better to carry out work on a flat surface, eliminating the risk of the car falling.
The first step is to remove the wheel and remove the brake drum. If the drum is stuck, gently tap it with a hammer through a piece of wood or use special pullers. Do not use excessive force to avoid damaging the wheel bearing or the drum itself. After removal you will see the mechanism brake cylinder, secured with two bolts to the beam.
Disconnect the brake hose from the cylinder, placing a container to drain the remaining fluid. Immediately plug the hole in the hose with a clean plug or bolt to prevent fluid from escaping and air from entering the system. Unscrew the cylinder mounting bolts and carefully remove it from its seat.
Install the new cylinder, first applying a thin layer of brake lubricant to the gasket. Tighten the mounting bolts to the recommended torque to avoid stripping the threads in the aluminum beam. Connect the brake hose, making sure there are no distortions. It is important to carry out all actions quickly to minimize the time the open system is in contact with air.
โ๏ธ Replacement Tools
What to do if the cylinder is jammed?
:If the piston does not come out or return, do not try to knock it out with a hammer. Use special spreading tools or gently heat the jammed area, but do not overheat the rubber.
After installing the new unit, it is necessary to bleed the brake system. This is a critical step because air in the hydraulics makes the brakes ineffective. Start bleeding from the wheel furthest from the master cylinder, that is, the rear right, then the rear left, the front right and finally the front left.
The correct brake bleeding sequence ensures that there are no air locks and that your vehicle's braking system performs at peak performance.
The nuances of bleeding the brake system
Bleeding the rear brakes Skoda Fabia 2 requires attention, since air often accumulates in drum mechanisms in hard-to-reach places. Use the "pumping" method, where one person presses the pedal and another person opens and closes the fitting. Do this until clear, bubble-free liquid comes out of the hose.
If you have access to a vacuum pump or electronic scanner, the process can be simplified. Some modern diagnostic tools allow you to activate modules ABS for forced bleeding if the system is equipped with an anti-lock braking system. However, for standard versions, mechanical bleeding remains the most reliable method.
Don't forget to check the brake fluid level in the expansion tank under the hood. If the level drops below the minimum during operation, new air will be drawn into the system and the process will have to start over. Use only fresh fluid that meets the standard DOT 4, and never mix different types of liquids.
- ๐ ๏ธ Use a clear hose to visually check for air bubbles in the escaping fluid.
- ๐งค Wear gloves, as brake fluid is extremely aggressive to the skin and paint of the car body.
- ๐ซ Do not pour liquid into the reservoir so that it does not get on the paintwork.
Typical repair mistakes and prevention
One common mistake is installing a new cylinder without replacing the brake pads. If the old pads have uneven wear or oil stains, the new mechanism will quickly fail. Always check the condition of the friction linings and, if necessary, replace them as a set.
Another common mistake is ignoring the condition of the guides and springs. The springs that hold the pads in place stretch and lose elasticity over time, which can cause the pads to not fit properly on the drum. Replace the entire set of return springs and retainers to ensure proper operation of the unit.
โ ๏ธ Attention! Never use compressed air to blow out the brake system. This may cause the rubber hoses to rupture and injure others.
Prevention of malfunctions includes regular checking of the condition of the boots and lubrication of mechanisms during scheduled maintenance. Clean the drums from dust and dirt, inspect them for cracks. Timely replacement of brake fluid every two years also significantly extends the life of all hydraulic components.
| Parameter | Meaning | Note |
|---|---|---|
| Liquid type | DOT 4 | Specification for VAG passenger cars |
| Piston diameter | 25.4 mm / 30 mm | Depends on cylinder modification |
| Tightening torque | 10-12 Nm | Attaching the cylinder to the beam |
| Service life | 60-100 thousand km | Provided the anthers are in good condition |
| Recommended Replacement | Once every 2 years | For brake fluid |
When replacing a cylinder, be sure to check the length of the springs. If they are too long or short, the pads will not press properly against the drum, reducing braking performance.
Relationship with ABS and electronics
On vehicles equipped with the system ABS, replacing the rear brake cylinder requires additional steps. After installing a new unit and bleeding the system, the ABS error indicator may light up. This is due to the fact that the pressure in the system has changed, or the speed sensor has detected a discrepancy.
In most cases, it is enough to drive a short distance at speeds above 15 km/h for the system to self-calibrate. However, if the error persists, computer diagnostics will be required to reset the errors and adapt the sensors. Ignoring ABS signals can cause the system to lock the wheels when braking, as if they were not working.
It is also worth considering that a faulty cylinder can cause false alarms of the stabilization system. If one of the wheel sensors receives incorrect data due to a jammed mechanism, the electronics can interpret this as a skid and begin to brake individual wheels for no reason. This creates discomfort and can be dangerous in certain situations.
How to check the operation of ABS after repair?
:Test drive on a safe road. Press the brake pedal firmly to activate the system. You should feel the pedal beating and hear the characteristic noise of the modulator.
For owners Skoda Fabia 2 A problem in one cylinder inevitably affects the operation of the entire system as a whole. Regular monitoring of the condition of components and timely replacement of worn parts is the key to your safety on the road.
What is the service life of the rear brake cylinder on Fabia 2?
Under normal operating conditions and no damage to the anthers, the service life of the cylinder ranges from 60 to 100 thousand kilometers. However, in conditions of harsh winters and reagents, this period can be reduced to 40-50 thousand kilometers.
Is it possible to replace just the cylinder cuffs instead of the whole assembly?
In theory, repair kits exist, but in practice, replacing the entire cylinder is more economical and reliable. Repairs require perfect cleanliness and precision, and old casings often have micro-scratches that will prevent new seals from providing a tight seal.
Why are the brakes still soft after replacement?
Most likely there is air left in the system. Try repeating the bleeding procedure, paying special attention to the rear wheels. Also check for fluid leaks at the hose connections or master cylinder.
Do I need to replace both rear cylinders at once?
It is strongly recommended to replace the cylinders in pairs. If one fails, the second is in a similar state of wear and tear and may fail soon. This will ensure uniform braking and safety.
How often should brake fluid be changed?
The manufacturer recommends changing the brake fluid every 2 years or every 40-50 thousand kilometers. The fluid absorbs moisture from the air, which lowers the boiling point and can lead to the system boiling during heavy braking.