Owners Skoda Octavia A7 sooner or later they are faced with the need to service the chassis, where the wheel hub is a critical element. This unit is responsible for the free rotation of the wheel and its rigid attachment to the suspension, taking on enormous loads when driving over uneven surfaces.
Ignoring the symptoms of bearing wear can lead to the wheel seizing on the road, which can lead to a serious accident. Therefore, timely diagnostics and competent selection of spare parts are not just a recommendation, but a necessity for the safe operation of the car.
In this article we will analyze in detail the design features of hub units for different modifications Octavia A7, we will learn to distinguish original parts from cheap counterfeits and provide a step-by-step DIY replacement algorithm.
Design features of the hub unit on the Octavia A7
Family cars Skoda Octavia A7 (produced from 2012 to 2020) are built on the Volkswagen Group MQB platform. This determines the unification of many components, including the front and rear suspension. The hub here is a complex unit that combines a rolling bearing, ABS sensor and fasteners.
The front axle uses a double-row ball bearing design that is pressed into the hub assembly. A special feature is the presence of a magnetic ring in the bearing design, which interacts with the wheel angle sensor or ABS sensor located in the steering knuckle.
Rear hub on most versions Octavia A7 also has a non-demountable design. Depending on the type of suspension (multi-link or semi-independent beam), the dimensions and mounting holes may vary slightly. It is important to note that rear wheel assemblies often use a self-locking nut that cannot be reused.
ABS integration is key. If you replace the hub with a part without a magnetic ring or with an incompatible sensor type, the ESP stabilization system and the ABS anti-lock braking system will stop working correctly and an error will appear on the dashboard.
Diagnosis of the malfunction and characteristic symptoms
Understand that the hub Skoda Octavia A7 requires replacement, based on a number of obvious signs that appear at different stages of wear. The very first signal is a characteristic hum or noise, reminiscent of a howl, which intensifies with increasing vehicle speed.
A feature of the diagnostic is that the sound changes its tone when you turn the steering wheel. If the noise increases when turning left, it means the right wheel hub is worn out, and vice versa. This occurs due to the redistribution of load to the outside of the turn.
In addition to acoustic signals, other symptoms may appear:
- ๐ The appearance of vibration on the steering wheel or body at certain speeds.
- โ ๏ธ The ABS or ESP light on the dashboard lights up due to a malfunction in the sensor signals.
- ๐ Wheel play when rocking it by hand in a vertical plane (on a lift).
In some cases, bearing wear leads to overheating of the hub. You may smell something burning or see smoke coming from your tire after a long drive. This is a critical stage that requires immediate stopping.
โ ๏ธ Attention: Don't ignore even the faintest hum. At high speeds, bearing failure can occur instantly, causing the wheel to separate from the vehicle.
For an accurate diagnosis, you need to lift the car on a lift and check the wheel play with your hands, and also listen to the operation of the unit with a stethoscope or a long screwdriver, placing one end on the suspension arm.
- Noise when driving
- Steering wheel vibration
- ABS error
- Wheel play
Choosing a spare part: original or high-quality analogue?
Spare parts market for Skoda Octavia A7 It is overloaded with offers, and it is very easy to make a mistake in choosing. The official original article of the hub is often unnecessarily expensive, but it guarantees maximum resource and accuracy of sensor landing.
However, there are proven manufacturers who supply parts to the Volkswagen conveyor. These include brands. SKF, FAG, SNR and Timken. These hubs are often identical to the original, but cost 30-40% less because they donโt have a logo. Skoda on the packaging.
It is not recommended to buy cheap analogues of unknown origin (the so-called "shop"). Savings of 1000-2000 rubles can result in the replacement of the node through 5000 kilometers of run and damage to the turning fist.
When choosing, pay attention to the equipment: ideally, the box should have a new hub nut, locking washers and lubricant. If the nut goes separately, make sure it has the correct strength class.
Comparison table of popular brands
To help you navigate, we have compiled a table with the characteristics of the most popular variants of hub bearings for your car. Comparison will help to find a balance between price and quality.
| Brand | Country | Average price (RUB) | Features |
|---|---|---|---|
| SKF | Sweden/Germany | 4500 - 6000 | Quality standard, often goes as OEM |
| FAG | Germany | 4800 - 6200 | High durability, excellent quality steel |
| SNR | France | 3800 - 5000 | Excellent price/quality balance, popular in Europe |
| Luk | Germany | 4000 - 5500 | A reliable option, included in the Schaeffler concern |
| Febi Bilstein | Germany | 3500 - 4500 | A good budget option, often overlaid |
Please note that prices may fluctuate depending on the region and the exchange rate. Always check the article by your carโs VIN code, as versions with powerful engines (such as 1.8 TSI or 2.0 TSI) may have reinforced nodes with different sizes.
The optimal choice for Octavia A7 are the hubs of the SKF or FAG brands, which provide a resource close to the factory original, at an adequate cost.
Preparation for replacement and necessary tools
The process of replacing the hub Skoda Octavia A7 It requires a certain set of tools and skills to work with suspension. Without specialized equipment, you risk damaging the threaded joints or the hub itself when dismantled.
You will need a standard set of wrenches and heads, including extension cords and collars. It is necessary to have a jack and reliable stands (goats) for fixing the car, since it is dangerous to work under the car on one jack.
A critically important tool is the removable for the hub nuts and the bearing itself. Also, you can not do without a dynamometer key for the correct tightening of all connections. To unscrew the boiling bolts, a penetrating lubricant (such as WD-40 or analog) and a heater will be required.
โ๏ธ Preparing to replace the hub
Before starting work, make sure that the car is on a flat surface, and the parking brake is tightened. If you change the rear hub, be sure to unlock the parking brake if it is cable, or put into service mode if it is electronic.
Step-by-step replacement instructions
We start the process with the wheel being removed. After removing the disc, the brake caliper must be unscrewed and hung on the wire so as not to damage the brake hose. Then the brake disc is removed, opening access to the hub.
The next step is to turn off the ABS sensor. Carefully disconnect the chip and unscrew the wire mount so that it does not interfere when knocking out the hub. Be very careful, the sensor is very fragile.
The main difficulty is to unscrew the central nut of the hub. It has a large puff moment, so use a strong collar and possibly an extension cord. If the nut does not lend itself, try to warm it up with a building hair dryer or blowtorch.
After removing the nut, unscrew the bolts of fastening the rotary fist to the lever and the shock absorber rack. Carefully knock out the hub with the help of a skipper or through a wooden spacer. Do not hit the bearing directly with a hammer!
Installing a new part requires cleanliness. Clean the seat in the swivel fist of rust and dirt. Press the new hub strictly perpendicularly, using a mandrel. Set a new nut and tighten it with a dynamometer key with the torque specified in the manual (usually about 250 Nm).
What to do if the hub does not come out?
If the hub is boiling, try to warm up the swivel fist around the hub (but not the hub itself, so as not to damage the bearing). Sometimes it helps to use a hydraulic press or a special remover. Never try to knock it through a hammer on the end of the shaft, it can deform the seats.
The assembly is done in reverse order. It is important to remember to install a new ABS sensor and check its performance before installing the wheel. After assembly, be sure to check the brake system for tightness and absence of backlashes.
โ ๏ธ Attention: The nut of the hub is a disposable element. Its re-installation is strictly prohibited, as this can lead to weakening of the connection and destruction of the node during movement.
If you are not confident in your abilities or do not have the necessary tool, it is better to entrust this work to professionals. An improper puff can lead to self-unwinding of the nut and the loss of the wheel.
Before starting work, be sure to take a picture of the location of the wires and ABS sensors, so as not to confuse them when assembling, especially if you have a complex wiring scheme.
Cost of work and repair time
If you decide to contact the service, the cost of replacement will consist of the price of spare parts and the norm-hour of work. On average, the replacement of one hub by Skoda Octavia A7 It takes 1.5 to 2.5 hours depending on the complexity of access and the condition of the fasteners.
Prices for services in specialized services range from 2500 to 4500 rubles per side. In dealerships, the cost may be higher, but they guarantee the use of original consumables and the correct puff.
If you change the hubs with a pair (for example, both front or both rear), many services offer a discount on work. It is also advisable from a safety point of view, since wear of nodes usually goes synchronously.
The total cost of repairs with spare parts of the middle price segment (for example, SKF or SNR) will be approximately 8000-12,000 rubles per side. It is a reasonable investment in safety and comfort.
Regular inspection of the chassis and timely replacement of the hub allow you to avoid expensive repairs of rotary fists and brake systems in the future.
Owner Frequently Asked Questions (FAQ)
Can I drive with a knocking hub before being replaced?
It's not recommended. Even a small hum speaks of critical wear. Riding with such a malfunction can lead to a jamming of the wheel, the destruction of the turning fist and an emergency situation on the road.
Do I need to change the hubs with a pair?
Preferably. If one hub is out of order, the second is most likely on the verge of wear. Replacing both will save time and money in the future, and will ensure that the car behaves evenly on the road.
Why did the ABS error catch fire after the replacement?
This may be due to damage to the ABS sensor during dismantling, poor contact in the connector, or the fact that the new hub has a different type of magnetic ring. Sometimes, the system needs to be adapted through a diagnostic scanner.
How often should I change the hub to Octavia A7?
The average life of a hub bearing is 80-120 thousand kilometers. However, it is highly dependent on the quality of roads, driving style and climatic conditions. Regular diagnosis at each maintenance will help to identify the problem at an early stage.
What to do if the hub nut does not unscrew?
Try to warm up the nut and thread, use penetrating lubricant. Sometimes it helps to hit the end of the nut through the sling. In extreme cases, the use of a removable or specialized tool for urgent replacement is required.