The braking system is the basis of the safety of any car, and the rear brake cylinder on the Škoda Fabia It plays a critical role in it. Over time, this unit is subjected to wear due to aggressive environment, moisture and high temperatures, which can lead to brake failure on the move. Ignoring the first signs of malfunction often ends up with expensive repairs to the entire braking system or, in the worst case, an emergency.
Owners Škoda Fabia Different generations (II, III and later) often face problems in the rear wheel cylinders, especially if the car is operated in conditions of slush or frequent off-road trips. Understanding the principles of work, the ability to recognize breakdown and knowledge of the nuances of the selection of spare parts allow you to avoid unnecessary costs and maintain a high level of safety.
Principle of operation and vulnerabilities of the rear cylinder
Rear brake cylinder in construction Škoda Fabia performs the function of converting hydraulic pressure into mechanical force, which pushes the brake pads and presses them against the drum (or disc, depending on the modification). Inside the cylinder body are pistons, compacted with rubber cuffs, which eventually lose their properties.
The main problem is that the rear wheels experience less load than the front wheels, so the brakes there work in the mode of "downtime" and "pollution". Dust, road chemistry and moisture penetrate through protective anthers, causing corrosion of the pistons' landing places. This leads to the fact that piston jamms Or the brake fluid starts leaking.
It is important to understand that even a slight leakage of fluid through worn seals can cause a drop in pressure in the circuit. Nana Škoda Fabia This is often manifested as a decrease in braking efficiency from the rear axle or uneven wear of the pads, when one of them is erased faster than the other due to the fact that the cylinder does not return to its original position.
⚠️ Warning: If you notice traces of brake fluid on the inside of the rear wheel or on the drum, the vehicle should be stopped immediately. This is a sign of critical wear of cylinder seals.
Symptoms of malfunction and diagnostic methods
To determine the problems with the rear brake cylinder can be a number of characteristic features that are often ignored by drivers before the appearance of a serious breakdown. The most obvious signal is spontaneous braking or “braking” on the move, when after releasing the pedal, the car continues to slow down.
Often owners Škoda Fabia complain of the smell of burning from under the wheels, which does not disappear even after a long parking. This indicates that the cylinder piston does not move away from the pads, and they are constantly rubbing against the drum. Also, the characteristic feature is brake-pedal Or, conversely, its failure, if the liquid goes into the crankcase.
When visually inspecting through the drum window or removing the wheel, you can see traces of leaks. However, the diagnosis should be comprehensive. It is necessary to check the condition of the brake fluid in the tank - if its level has fallen, and there are no traces of undertightness outside, perhaps the problem is hidden inside the system or in the main cylinder, but most often it is a leak from the rear node.
- 🚗 Uneven wear of the rear brake pads (one side is erased stronger than the other).
- 🚗 The appearance of vibration or beat when pressing the brake pedal at speed.
- 🚗 Screaming or grinding that is heard only when reversing or at low speeds.
Choosing quality spare parts and brands
The auto parts market offers a huge selection of options for Škoda Fabia, from original parts to budget analogues. When choosing rear-brake cylinder The savings can be dangerous, as the poor-quality rubber seals will quickly collapse, and the aluminum case can burst at high pressure.
Original parts Škoda (VAGs) guarantee maximum conformity to factory performance, but their price is often overpriced. A good alternative is proven brands-suppliers on the conveyor line, such as TRW, ATE, Brembo or Febi Bilstein. These manufacturers use materials of the same quality as the original, but at a more affordable price.
Avoid buying cylinders from unknown Chinese brands without certificates. They often use cheap seals that “blown” in the cold or swell from high temperature, which leads to a jamming mechanism. Before buying, be sure to check the catalog number of the part, as for different modifications Škoda Fabia (with and without ABS, with different types of drums) can be put different nodes.
- Original VAG
- ATE/TRW
- Brembo
- Budget analogue
Step-by-step instructions for replacing the cylinder
Replacement of the rear brake cylinder with Škoda Fabia - a task of medium complexity, which will cope with an experienced motorist with the presence of a standard set of tools. The process begins with lifting the car on a lift or jack and removing the rear wheel. It is important to securely fix the body of the car to avoid falling.
The next step is to remove the brake drum. If the drum is not removed by hands, use special bolts-pressors, screwing them into the technological holes. Do not try to knock it down with a hammer, as this can damage the seat or the drum itself. After removing the drum, you will have full access to the mechanism.
Disconnect the hand brake cable from the cylinder lever, having previously unscrewed the lock. Then unscrew the connection of the brake fluid supply, substituting a container for draining the residues. Unscrew the cylinder mount bolts to the rear axle and gently remove it. Install the new cylinder in reverse order, not forgetting to lubricate the guides and seats of the special engine. brake lubricant.
☑️ Preparing for replacement
After installing a new unit, the brake system must be pumped. This is done manually or by using a vacuum pump. It is important to remove all air from the circuit, otherwise the braking efficiency will be low. Check the level of liquid in the tank and add it to the maximum.
What to do if the drum cannot be removed?
Often the drum clings because of rust. Try to warm it up with a building hairdryer or gently tap a wooden kiyanka on the inner crown. In extreme cases, you can use a removable, but act carefully so as not to damage the bearing of the hub.
Typical repair mistakes and prevention
One of the most common mistakes is to install the anther incorrectly. If the anther is torn or crooked, dirt and moisture will quickly get inside the cylinder, and the new assembly will fail after several thousand kilometers. Always check the condition of the anthers before installation.
Another mistake is using poor-quality brake fluid or mixing different types (for example, DOT 3 and DOT 5). This can lead to a chemical reaction that destroys rubber seals. Nana Škoda Fabia It is recommended to use standard fluid DOT 4 with the appropriate VAG tolerances.
Often, masters forget to clean the seat on the axis from rust and old lubricant. This leads to the fact that the cylinder does not sit tightly, and there is a distortion, which provokes rapid wear. Use a metal brush and degreaser before installing a new node.
⚠️ Warning: Never attempt to repair an old cylinder by replacing only the cuff. Corrosion inside the body is often irreversible, and even new cuffs will not provide tightness. Replace the entire knot.
Before starting work with the brake system, be sure to wear protective glasses. Getting brake fluid into the eyes can cause serious irritation and damage to the cornea.
Repair cost and completion time
The total cost of repair depends on the selected spare part and the need for additional work. The cylinder itself costs on average from 1,500 to 4,000 rubles, depending on the brand. If brake pads need to be replaced or drums need to be resurfaced, the total cost will increase.
Working time usually takes from 1 to 2 hours per wheel. If a pair of cylinders is changed at once, the technician can spend about 2.5–3 hours.
| Component | Average price (RUB) | Service life (km) | Recommendation |
|---|---|---|---|
| Cylinder (original) | 3500 - 5000 | 100 000+ | Ideal for long-term use |
| Cylinder (ATE/TRW) | 2000 - 3000 | 80 000 - 100 000 | Optimal price-quality ratio |
| Cylinder (budget) | 1000 - 1500 | 30 000 - 50 000 | For temporary solution only |
| Repair kit | 500 - 800 | Not recommended | Efficiency is low, risk of leakage is high |
Replacement of the rear brake cylinder is not only a restoration of braking function, but also an opportunity to extend the life of the entire rear axle of the car, provided that it is installed properly and the correct materials are used.
FAQ: Frequently asked questions
Is it possible to replace only one rear brake cylinder?
Technically you can replace them, but it is highly recommended to replace them in pairs. If one cylinder is worn out, then the second is in similar operating conditions and may soon also fail. In addition, the difference in braking efficiency between the axles can cause the vehicle to skid.
How often should the condition of the rear cylinders be checked?
It is recommended to carry out a visual inspection every time the brake pads are replaced (usually every 30-50 thousand km). It is also worth paying attention to the level of brake fluid and the behavior of the pedal when driving.
What should I do if after replacement the brake pedal is “soft”?
Most likely there is air left in the system. The brake system needs to be re-bleeded. If the problem persists, check the quality of installation of the fittings and the absence of micro-smudges.
Do I need to grind the drum when replacing the cylinder?
No, grooving is not necessary if there are no deep grooves or gouges on the surface of the drum. It is enough to clean it from dust and dirt. If the wear is critical, it is better to replace the drum too.
Does replacing a cylinder affect ABS performance?
The direct impact is minimal since ABS works with speed sensors. However, if the old cylinder was causing the wheel to seize, the ABS sensor could detect errors. After replacement and bleeding, the system should work normally, and errors will disappear after several driving cycles.