A characteristic hum that intensifies when the steering wheel is turned, or wheel play are sure signs that wheel bearing on your vehicle requires immediate attention. For owners Skoda Rapid This problem occurs quite often, especially if the car is operated on bad roads or has a high mileage. Ignoring these symptoms can result in a wheel seizing while driving, which could result in a serious accident.
The replacement process is not super complex, but requires specialized tools and some experience working with the chassis. Unlike some other models, the suspension design Rapid has its own nuances that must be taken into account so as not to damage the brake system or levers. In this article we will analyze each stage of work, from diagnostics to final tightening of bolts.
Diagnosis of faults and selection of spare parts
Before you start disassembling, you need to make sure that the culprit of the noise is exactly what is causing the noise. Often owners Skoda Rapid confuse wheel bearing knocking noise with knocking noise CV joint or silent blocks of levers. For an accurate diagnosis, it is recommended to jack up the car and rock the wheel with your hands at the top and bottom. If play is felt, and a hum or crunch is heard when rotating, the problem is in the hub.
When choosing a new spare part, it is critical to pay attention to the manufacturer. The market is full of counterfeits, so it is better to trust proven brands such as SKF, SNR, FAG or Lemfรถrder. Cheap analogues often fail after 10โ15 thousand kilometers, forcing you to pay for the work of a specialist again.
- ๐ Check the markings on the old part before going to the store - this will make it easier to find the original number.
- ๐ ๏ธ Please note that the kit includes a built-in ABS sensor (it often comes complete with the hub).
- ๐ฐ Compare prices in several stores, but do not chase the lowest price at the risk of quality.
โ ๏ธ Caution: Never attempt to โbleedโ or lubricate an old bearing. This is a sealed unit, and after loss of lubrication or moisture entry, it operates in the โkillingโ mode of the brake disc and axle.
It is also worth considering that the Skoda Rapid Often the hub assembly with brake disc and speed sensor is replaced, since dismantling the old sensor can lead to its failure. This increases the cost of repairs, but saves time and nerves.
Necessary tools and preparation
To do the job well, you will need a set of tools, which not every home craftsman may have. A standard set of wrenches will not help here, since the hub nuts are tightened with enormous force, and the bearing seat often sticks to the steering knuckle.
The key element will be wheel bearing puller or a powerful hydraulic press. Without them, you risk bending the steering knuckle or damaging the threads. Also be sure to have a torque wrench ready to properly tighten the fasteners at the end of the job.
- ๐ง A 30 mm socket (or 32 mm depending on the year of manufacture) for unscrewing the hub nut.
- ๐จ Wheelbrace wrench with extension for unscrewing wheel bolts.
- ๐จ A hammer and a punch, or a mounting blade for pressing out the part.
โ๏ธ Preparing to replace the hub
Before starting work, make sure that the car is securely supported on stands. Jack This is only a lifting aid and not a support for working under the machine. Never work under a vehicle that is only on a jack, even if you are replacing just one hub.
Step-by-step instructions for dismantling
The process begins with removing the wheel. After this, you need to loosen the hub nut, which is located in the center of the brake disc. Often it is protected by a plastic cap, which must be carefully pryed off with a screwdriver. Unscrewing the nut will require significant force, so it is better to use a long lever.
Next, unscrew the brake caliper mounting bolts. It is not necessary to completely remove the caliper; just unscrew the guides and hang it on a strong wire to a spring or lever so as not to damage the brake hose. This will free up access to the steering knuckle.
Then the bolts securing the steering knuckle to the lever and shock absorber are unscrewed. Usually there are two at the bottom and one at the top. After unscrewing all the fasteners, the steering knuckle can be carefully moved to the side. Be careful not to pull it sharply to avoid damaging the brake hose and ABS sensor wire.
What to do if the hub nut does not unscrew?
If the nut is stuck, use a penetrating lubricant (WD-40 or similar) and let it sit for 15-20 minutes. You can also heat the nut with a blowtorch, but be careful with the brake fluid and rubber parts.
Now the most crucial moment is removing the hub from the steering knuckle. If it doesn't work, use a special puller. If there is no puller, you can carefully knock out the hub from the inside, leaning on the inner race of the bearing. Never hit the outer ring, as this will destroy the separator and ball elements.
โ ๏ธ Caution: When knocking out the hub, use a spacer made of soft metal or wood to avoid damaging the threads on the axle shaft.
- Once a year
- Once every 2 years
- Only in case of breakdown
- Never checked
After removing the hub, it is necessary to clean the seat in the steering knuckle from rust and dirt. Use a wire brush and sandpaper. The surface must be perfectly smooth, otherwise the new bearing may jam or quickly fail due to misalignment.
Installation of a new part and assembly nuances
Installing a new bearing requires precision. It must be pressed strictly along the outer ring. If you put pressure on the inner ring, you can damage the cage and the bearing will fail in a few days. Use a mandrel of a suitable diameter or a vice if you are working without a press.
After pressing the bearing into the steering knuckle, install the hub inside. It should go in with slight effort. Next, reassemble the assembly in reverse order: secure the steering knuckle to the lever and strut, install the brake caliper and put on the wheel.
- ๐ฉ Tighten the steering knuckle bolts in a crisscross pattern to distribute the load evenly.
- ๐ Be sure to install a new locking pin on the hub nut if the design provides one.
- ๐งผ Check the condition of the CV joint boot - it could have torn during dismantling.
The final stage is tightening the hub nut. This is a critical point. Tightening torque for Skoda Rapid usually around 250 Nm (see the service book for the exact moment). An under-tightened nut will lead to play and destruction of the bearing, and a twisted nut will lead to thread breakage or deformation of the axle.
Before tightening the hub nut, have a helper press the brake pedal to secure the disc and prevent it from spinning. This will make the job easier and ensure proper tightening.
Cost of work and common mistakes
The cost of repairs consists of the cost of spare parts and labor. An original hub assembly can cost from 8,000 to 15,000 rubles, high-quality analogues can cost from 4,000 to 7,000 rubles. Replacement work in the service usually takes 1.5โ2 hours and costs around 3000โ5000 rubles per side.
Many mechanics make the mistake of trying to repress an old bearing or use old mounting bolts. This is strictly prohibited. Fasteners, especially hub and control arm bolts, often have stretched threads when removed.
| Component | Approximate price (analogue) | Approximate price (original) | Service life |
|---|---|---|---|
| Wheel bearing (front) | 4 500 โฝ | 12 000 โฝ | 80,000 - 120,000 km |
| Hub assembly with sensor | 6 000 โฝ | 14 500 โฝ | 100,000+ km |
| Hub nut (new) | 300 โฝ | 800 โฝ | One-time |
| Knuckle bolts | 500 rubles (set) | 1,500 rubles (set) | One-time |
โ ๏ธ Attention: Skimping on bolts and nuts may result in them being loosened while moving. These elements operate under cyclic loads and lose their properties after the first removal.
It is also worth remembering that after replacing the hub, if the wheel alignment elements were affected, it is necessary to adjust the wheel alignment angles. Ignoring this step will result in uneven tire wear and steering wheel pull to the side.
Correct tightening of the hub nut with a torque wrench is the key to long service life of the new bearing and driving safety.
FAQ: Frequently asked questions
Is it possible to replace the hub without removing the steering knuckle?
In most cases on Skoda Rapid this is impossible. The suspension design requires the knuckle to be disconnected from the arm and strut to access the bearing. Trying to do this "in situ" may result in damage to the brake hoses or sensors.
Do I need to change the ABS sensor when replacing the hub?
If the sensor comes complete with the hub (most modern models), then yes. If it is removed separately and is in good condition, you can leave the old one. However, old sensors often break during dismantling, so it is better to have a backup option.
What is the torque for the hub nut on the Rapid?
The standard tightening torque is 250 Nm plus the torque angle (usually 90 degrees or until it locks, depending on the type of nut). Be sure to check the data in the service documentation for the specific year of manufacture of your car.
Why does the hub jam a month after replacement?
Most likely, the pressing technology was violated (pressure on the inner ring) or the seating surface was not cleaned of rust. An error may also occur when tightening the hub nut.
The most common reason for premature failure of a new hub is the lack of alignment adjustment after replacement. Improper wheel alignment angles create a lateral load on the bearing that is 3-4 times higher than normal, which leads to its rapid destruction.
Regular monitoring of the condition of the chassis and timely replacement of worn parts will ensure your safety and comfort when driving Skoda Rapid. Do not put off repairs until later, as the cost of eliminating the consequences of a jammed wheel can be several times higher than the price of a new spare part.