Operation Skoda Octavia A7 requires regular attention to components responsible for safety. The rear brake system of this car has its own characteristics that distinguish it from front-wheel drive analogues or models with drum mechanisms at the rear. Ignoring the timing of replacement of consumables can lead to critical wear of the calipers and even wheel jamming.
Owners often find that the standard algorithm for replacing pads does not work without prior preparation. In particular, the rear caliper piston is not simply squeezed out, but screwed into the housing. Understanding these mechanics is the key to successful repairs without unnecessary repair shop costs.
Wear diagnostics and selection of suitable components
The first step in maintenance is proper diagnosis. On Skoda Octavia A7 Electronic wear sensors are installed, which can light up on the dashboard before physical wear of the material. However, you cannot rely only on the indicator, as the wiring may oxidize or the sensor may fail.
Visual inspection through the wheel rim allows you to assess the thickness of the friction lining. If it becomes thinner than 2-3 mm, replace brake pads becomes inevitable. You should not wait for the metal to completely wear off on the disc, as this will lead to expensive repairs. brake discs.
When choosing spare parts, it is important to consider the type of brake system, since on different modifications Octavia A7 There may be calipers from different manufacturers. Main brands recommended for replacement:
- π§ ATE or TRW - original suppliers providing a factory balance between braking and comfort.
- π§ Textar or Remsa - high-quality analogues, often found in spare parts catalogs for European cars.
- π§ Budget options - require more frequent replacement and can create increased noise when braking.
Be sure to check the package. New clamps are often included with the pads, but the wear indicator is usually sold separately or complete with a wire. Purchase everything you need in advance so as not to disassemble the mechanism twice.
Preparation of tools and workplace
To carry out quality work, you will need a specific set of tools. A standard jack and wrenches won't do the job here. Pay special attention to the tool for screwing in the caliper piston, as without it you can easily damage the mechanism.
You will need: a set of open-end and socket wrenches, a torque wrench for tightening bolts, a wheel wrench, and a special device for expanding the piston. Also have a clean rag and a can of compressed air or brake cleaner ready.
Remember that the brake system operates under high pressure. Before starting work, make sure that the vehicle is securely supported on supports. Never rely solely on a hydraulic jack when under the vehicle.
- π οΈ Ratchet and extensions β for access to caliper mounting bolts in hard-to-reach places.
- π οΈ Copper grease β for processing the contact points between the bracket and the caliper (do not use graphite or lithol).
- π οΈ Multimeter - to check the integrity of the wear sensor circuit.
Prepare a place under the car. Work is better done on a hole or lift, but if you use a jack, make sure the surface is solid and flat. Open the hood and check the level of brake fluid in the tank - it can rise when pistons are pressed in.
- According to regulations (30-40 thousand km)
- Based on wear and tear
- Once every 2 years
- I don't know the exact timeline.
Step-by-step instructions for removal and replacement
Start the process by loosening the wheel bolts on a standing car. Lift the back of the car, remove the wheel and fix the body on a reliable stand. Now you can start removing the caliphate. Unscrew the bottom guide bolt, holding the top key to 13 or 14 mm.
The subport is drawn upwards on the hinge. Be careful not to damage the brake hose. Lock it with wire or hook so that it does not hang on the hose under its own weight. Now you can take out the old ones. brake pads brace.
Check the brace and the guides. If there are traces of corrosion, carefully clean them and lubricate them with a special high-temperature lubricant. The purity and smoothness of the straps directly affect the effectiveness of braking and the absence of creaks.
βοΈ Check before installation
Install new pads in the brace. Pay attention to anti-script plates - they should fit tightly to the body of the braces. If the plates are old and deformed, it is better to replace them, as they extinguish the vibrations when braking.
What to do if the shoes do not stand in the brace?
If the new pads do not fit in the brace, check if you have installed the anti-script plates correctly. Also make sure you donβt mix up the left and right sides, as they have different sensor mount geometry.
Before you put the caliper back on, you need to drown the piston. This is a critical stage. You can't just press it in - you need to rotate clockwise. Use a special one. screw-up Or a universal set of adapters.
β οΈ Attention! If you try to push the piston without rotating, you will break the parking brake's self-expression mechanism, which will require replacing the entire caliper.
After installing new pads and screwing the piston, put the caliper on the disc and fix with guide bolts. Tighten them at the recommended moment, usually around 25-30 Nm, but it is better to check the service book for your specific modification. Octavia A7.
Proper lubrication of the guides and the use of a dynamometer key is the key to the absence of the brake pedal and creaks.
Checking the wear sensor and electrics
On many trim levels Skoda Octavia A7 An electronic wear sensor is installed. If you changed the pads ahead of time, but the indicator on the panel was on fire, the new sensor may not work immediately. In some cases, an error reset via a diagnostic scanner is required.
If the sensor has changed along with the pads, make sure that the connector is tightly connected and the wire is not clamped. The sensor wiring often takes place in a place where it can rub against the wheel arch or suspension elements when moving.
After assembly, scroll the wheel with your hand. It should rotate freely, without touching the pads on the disk. If there is resistance, check if the piston is completely drowned. Also inspect the anther of the brake cylinder for damage.
Before installing the wheel, apply a thin layer of copper lubricant to the seat of the disc and hub to avoid the wheel sticking to the disc in winter.
Table of puffing moments and recommended lubricants
Compliance with the tightening moments of bolts is critical for safety. Excessive force can tear the thread or deform parts, and insufficient will lead to unwinding of the caliper on the go. Use the table below as a guide.
| Fastening element | Tightening torque (Nm) | Recommended Lubricant |
|---|---|---|
| Bolts of calipers guide | 25-30 | silicone or ceramic |
| Bolts for bracket attachment | 35-45 | Copper high-temperature |
| Wheel bolts | 120 | No lubricant (pure metal) |
| Wear sensor attachment | 5-7 | Plastic clips |
Use high-quality lubricants for all moving nodes. Conventional engine oil or solidol are categorically not suitable here, since they dissolve with brake fluid or burn out at high temperatures.
Remember that after replacing the pads, the brake pedal can be soft. This is normal, as the pistons need time to get used to the new material of the lining. However, if the pedal falls to the floor, you need to check the system for air.
Brake system running and testing
After installing new pads and assembling the wheel, you should not immediately go into a dense urban stream. The first 100-200 kilometers must be observed mode of gentle running. Avoid heavy braking and stop completely at high speed.
Check the brakes on an empty road. Smoothly press the pedal, making sure that the car stops smoothly, without taking a step away. If the car is pulling left or right, it is possible that one of the pistons has jammed or you forgot to lubricate the guides.
Listen carefully to the sounds. Light creaking in the first kilometers is acceptable, but a constant screeching or metal grinding is a sign of a problem. Perhaps a small stone has fallen between the pad and the disc, or you have not installed antiscrip plates.
What if the brakes do not work after replacement?
If the pedal fails, you may not have completely drowned the piston and it did not reach the stop, or air got into the system. In any case, a system inspection by a specialist is required.
Make sure the brake indicator on the dashboard is off. If it keeps burning, check the sensor connection or try to reset the error through the car menu or OBD scanner.
β οΈ Attention! If you do not use a special tool to screw the piston, you are guaranteed to damage the parking brake mechanism, which will lead to the need to replace the entire caliper.
Regular replacement of pads is not just a cost, but an investment in your safety and safety of expensive car components. Properly executed procedure for Skoda Octavia A7 It will provide confidence on the road and many years of trouble-free operation.
Frequently asked questions and answers
Can I replace the rear brake pads without removing the caliper completely?
No, to replace the pads, you need to remove the caliper from the guides to remove the old elements and install new ones. Completely dismantle the caliper from the bracket is not necessary, but it must be removed.
How do you know if itβs time to change the sensor?
The sensor changes with the pads if the lamp on the dashboard lights up. If the lamp is not burning, but the pads are worn out, the sensor can be left, if it is mechanically intact and the wire is not damaged.
Do I need to change the brake fluid when replacing the pads?
Replacement of the pads does not require mandatory replacement of the liquid if the level in the tank is normal and it is not expired. However, if you have been opening the system or liquid for more than 2 years, it is best to make a full replacement.
Why is the brake pedal soft after replacing the pads?
This is normal in the first days of operation. The pistons need time to clean themselves. If the softness does not pass, perhaps air got into the system, and brakes will need to be pumped.
Can a universal tool be used to screw a piston?
Yes, there are universal adapter sets that are suitable for most cars, including: Skoda Octavia A7. The main thing is to choose the right size and type of thread.