Rear brake system in a car Škoda Rapid often raises questions among owners when maintenance is required. Unlike disk mechanisms, a drum assembly requires more careful preparation and knowledge of specific design nuances. Incorrect actions when trying to withdraw brake drum may cause damage to work surfaces or even breakage of parts.
The dismantling process seems simple only at first glance, since the mechanism often gets stuck due to corrosion or deformation. To avoid unnecessary repair costs and guarantee the safety of further operation, it is necessary to strictly follow the sequence of actions. In this material we will analyze all stages of work, from preparing tools to installing a new unit.
Preparation of the workplace and necessary tools
Before starting work, it is extremely important to ensure access to the wheel arches and create safe conditions for lifting the vehicle. A regular jack may not be enough, so body stand is a mandatory safety element. With the machine on a level surface, apply the handbrake and chock the front wheels.
To successfully complete the task, you will need a set of specialized tools, which not every car enthusiast has. Basic set includes ratchet wrench with 10, 13 and 17 mm heads, as well as a powerful flat-blade screwdriver. You cannot do without a penetrating lubricant like WD-40 or analogues, since the fastening bolts often rust.
- 🛠️ A set of sockets and extensions for accessing hard-to-reach bolts.
- 🔨 A hammer (preferably with a rubber tip) to gently knock down the drum.
- 🧴 Cylinder with penetrating liquid for processing threaded connections.
- 🧤 Protective gloves and goggles to protect your hands and eyes from rust and dirt.
Pay special attention to the state of your workspace. Dirt and dust can get inside the brake mechanism during disassembly, which will accelerate wear. brake pads and drum. Recommended to use drum puller, if available, as this will greatly simplify the process and reduce the risk of injury.
Wheel dismantling and pre-processing of components
Once the car is securely secured, proceed to remove the rear wheel. Loosen the wheel bolts before you jack up the car, as spinning the rim while suspended will make this difficult. By removing the wheel you will have full access to brake mechanism and rear hub.
Now you need to treat the fasteners with penetrating lubricant. In design Škoda Rapid The drum mounting bolts are often located on the back of the disc and can be heavily oxidized. Apply the compound liberally to the threads and wait 10-15 minutes for it to penetrate into the gaps and eat away the rust.
It is important to note that on some modifications hand brake may be blocked if you do not release the lever all the way down. Check that the cable is completely free, otherwise the drum will not be removed even with the bolts unscrewed. If the mechanism is stuck, try rocking the car slightly to loosen the tension.
⚠️ Attention! Never attempt to knock down a drum with a hammer until all mounting bolts have been removed. This can lead to destruction of the hub bearing or deformation of the unit itself.
Clean the area around the bolts of any accumulated dirt with a metal brush. Dust and sand mixed with brake fluid can get inside the mechanism during dismantling, which is unacceptable for operation. working cylinders. Use compressed air or a rag to remove the bulk of dirt before starting disassembly.
Unscrewing the mounting bolts and removing the drum
The main stage of the work is to remove the two guide bolts that secure the drum to the hub. Use a 10mm socket (8mm may be needed in some cases) and unscrew them counterclockwise. If the bolts rotate along with the drum, they need to be secured.
Sometimes fasteners stick so tightly that it is impossible to remove them with a standard wrench. In such a situation, you can use a special puller or gently heat the area around the bolt with a hair dryer. The main thing is not to overheat the part itself, so as not to damage the heat-resistant seals.
- 🔩 Use an impact driver if the bolts are slotted and won't budge.
- 🔑 Use a wrench with a long arm to increase the leverage when unscrewing.
- 🛡️ Secure the bolt with pliers or a clamp if it rotates with the drum.
After removing the bolts, the drum may not come off immediately, as it often sits on the guide pins. This will come in handy drum puller, which evenly presses the part away from the hub. If you don’t have such a tool, you can gently tap the inside of the drum with a rubber mallet through the technological holes.
⚠️ Attention! Do not hit the edge of the drum or the brake pads with a hammer, as this may cause them to break and cause cracks to appear on the working surface.
- Impact screwdriver
- Drum puller
- Hammer
- Penetrating lubricant
If the drum still does not come off, try rotating it around the hub axis while lightly prying it with a screwdriver. It is important to work slowly and evenly so as not to damage the seat. In some cases, heating the drum helps, as the metal expands and releases jammed areas.
Removing jamming and working with the hub
A situation where the drum does not come off even after removing the bolts is often due to deformation or severe wear. brake pads. If the shoes move apart and rest against the drum, they create a wedge effect. In this case, it is necessary to pry the mechanism through the technological holes and compress the pads.
Use a flathead screwdriver or special parking brake adjustment tool to pull the pads inward. On the rear drums Škoda Rapid There is often an adjustment mechanism that can be turned through a hole in the base of the shield. This will free up space for removing the part.
Sometimes the cause of jamming is corrosion at the hub seat. If the metal is stuck to the drum, more aggressive action will be required. Apply grease to the end of the hub and wait until it penetrates into the gap. Then try to gently rock the drum from side to side.
What to do if the thread on a bolt is broken?
If the thread is broken, you can try to restore it with a tap or use a bolt with a larger thread, having first cut a new one. As a last resort, drill out the old bolt and re-thread.
It is important to check the condition of the wheel bearing after removing the drum. It should rotate smoothly, without backlash or extraneous noise. Any signs of bearing wear require immediate replacement as it is a critical safety element.
☑️ Check before removal
Internal structure and replacement of pads
After removing the drum, you will see the internal structure of the brake mechanism. Here are located brake pads, spacer bar, springs and working cylinder. Inspect all parts for wear, cracks, or signs of brake fluid leakage.
The pads must be replaced as a set for both axles. If you only change one pad, this can lead to uneven braking and the car skidding. Check the condition of the guides along which the pads slide, and if necessary, clean them of dirt and apply special lubricant.
- 🔍 Measure the thickness of the friction layer of the pads - the minimum acceptable value is indicated in the manual.
- 🧼 Brush surfaces to remove brake dust, which is toxic and harmful to the lungs.
- 🛢️ Check that the working cylinder is tight and there are no leaks on its body.
When installing new pads, pay attention to the position of the return springs and spacer bar. They must be properly tensioned and locked in place. Improper assembly may cause the pads to jam or not press against the drum.
⚠️ Attention! Brake dust is extremely harmful to health. Be sure to use a respirator and work in a ventilated area when cleaning the mechanism.
Don't forget to check the condition of the handbrake cable. It should move freely and have no visible damage to the braid. If the cable becomes stuck or rusts, it can cause the vehicle to not stay in place on a slope. Lubricate the cable with special lubricant before assembly.
Assembly and final setup
Installing a new or remanufactured drum should be done in the reverse order. Make sure the seating surfaces are clean and free of burrs. Place the drum onto the hub and secure it with two guide bolts.
The bolts must be tightened with a certain force to avoid distortion of the part. Use a torque wrench if you have one. Usually the tightening torque is about 10-12 Nm, but it is better to check this value in the technical documentation for your car.
After installing the drum, it is necessary to adjust the gap between the pads and the working surface. This is done through an adjustment mechanism located on the brake shield. Rotate it until the shoes just lightly touch the drum, then back it up a few times.
It is important to check the operation of the handbrake after assembly. The lever must be fixed in several positions and provide reliable wheel locking. If the lever travel is too large or too small, additional cable adjustment will be required.
| Parameter | Meaning | Unit of measurement |
|---|---|---|
| Drum diameter (new) | 203 | mm |
| Maximum wear | 204.5 | mm |
| Bolt torque | 10-12 | Nm |
| Pad thickness (new) | 2.5 | mm |
| Minimum pad thickness | 1.0 | mm |
Before installing the wheel, apply a thin layer of graphite grease to the contact point between the hub disc and the wheel rim to avoid sticking in the future.
Technical nuances and common errors
One of the most common mistakes during dismantling is trying to remove the drum without first adjusting the pads. If the shoes are spread apart, they will rest against the edges of the drum and it will be impossible to remove it. This may damage the guide pins or the housing itself.
Another mistake is using excessive force when knocking down the drum. Hitting the edges with a hammer can lead to the formation of cracks that are not visible to the eye, but will cause destruction of the drum during operation. Always use soft points or special pullers.
Otherwise, at the first emergency braking, the pedal will fall to the floor. Check the brake fluid level in the reservoir before driving.
Regularly checking and replacing brake pads is the key to the safety and durability of your vehicle's entire braking system.
If you encounter serious problems during disassembly, do not try to solve them by force. It is better to contact professionals or a service center. Improperly carried out repairs can cost you much more than the services of specialists.
⚠️ Attention! After completing the work, be sure to test the brakes on a safe part of the road to ensure they are working properly.
Remember that the braking system is a critical element of vehicle safety. Any manipulations with it must be carried out with maximum care and responsibility. Regular maintenance will help avoid sudden breakdowns and ensure reliable operation. Škoda Rapid for many years.
Questions and answers (FAQ)
Why doesn't the drum come off even after unscrewing the bolts?
Most often this happens because the brake pads are pushed apart and rest against the edges of the drum. It is necessary to pry the mechanism through the technological holes and compress the pads, or adjust the handbrake to free up the gap.
How much force should be applied to tighten the drum bolts?
Recommended tightening torque for rear drum mounting bolts Škoda Rapid is 10-12 Nm. Using a torque wrench will help avoid over-tightening or under-torque, which is critical for an even fit.
Is it possible to remove the drum without a special puller?
Yes, you can do without a puller if you gently tap the inside of the drum with a rubber mallet or heat it with a hair dryer. However, a puller greatly simplifies the process and reduces the risk of damage to parts.
Do I need to change the drum every time I change the pads?
No, the drum only needs to be replaced if it is significantly worn, has deep grooves or cracks. Check the thickness of the drum according to the technical specifications - if it is within the normal range, just clean and lubricate it.
What should I do if I hear a grinding noise while driving after replacement?
This may mean that the pads are not fully seated or that there is a foreign object in the mechanism. Check the correct installation of the springs and spacer bar, and also make sure that the pads are not distorted during installation.