Second-hand brake system: how to safely choose discs, calipers and ABS?
The value of safety in a car is not subject to compromise. One of the most important systems that affect our safety is the braking system . Replacing components such as brake discs, calipers or ABS module with used ones can be a cause for concern - but with proper verification and adherence to purchasing procedures, used car parts can provide not only savings, but also full functionality. Here is a comprehensive checklist on how to safely choose used braking system components from a store like Global Parts.
Why consider used brake parts?
Second-hand car parts, especially used car parts for brakes - discs, calipers, ABS pumps - offered by trusted suppliers, can be original, efficient and attractively priced. Thanks to this, the buyer saves without sacrificing OEM quality. Global Parts as a car shop offers parts for premium brands: BMW, Mercedes, Audi, VW, Mini. For popular models such as BMW E90, F30, E87, or X3 F25/E83, the shop provides a wide selection of brake discs - front and rear - and calipers. With the correct check list, you can safely decide on used parts.
Checklist for checking the wear and quality of used brake parts
Checking approvals and quality certificates
When buying brake discs, even used ones, you should make sure that they have the European ECE R90-02 homologation. This standard guarantees that the spare parts meet strict quality and safety requirements, comparable to the original components fitted at the factory. In the Global Parts store you can find discs that meet these standards, which is especially important for models such as BMW E90 front brake discs or BMW F30 brake discs .
Disc wear check
- Disc Thickness: The minimum operating thickness is specified by the manufacturer. Using a micrometer, measure the disc at several points (minimum 8) to assess the thickness difference and wear. The difference between the thickest and thinnest point should not exceed the permissible values.
- Lateral Runout: Measuring the disc runout (deviation from flatness) is crucial, as excessive runout can cause vibration and uneven brake pad wear. Measurement is done with a dial gauge.
- Surface condition: Discs should be free of cracks, deep scratches and corrosion. Even used discs, such as BMW E87 brake discs or BMW X3 F25 brake discs, must be in good visual condition.
Matching to model and year
The discs used must be compatible with the model and year of the vehicle. For example, BMW E90 brake discs are different from BMW F20 discs. The Global Parts store offers dedicated parts for BMW E87, BMW F30, BMW X3 E83, Audi A3 8P (both front and rear).
Checking pad and caliper compatibility
The selection of discs should take into account compatibility with brake pads and calipers. Poorly selected components can lead to faster wear and reduced braking efficiency. Used calipers must also be thoroughly checked for tightness, condition of pistons and guides.
Brake caliper inspection and selection
Calipers are an element that directly affects braking power and safety. When buying used calipers, you should:
- Check the condition of the pistons and seals – leaks can lead to brake fluid leakage and pressure loss.
- Make sure that the terminals are not corroded or mechanically damaged.
- Verify that the calipers are compatible with your specific car model and discs, e.g. calipers for BMW E90 or BMW X3 F25 .
- In the case of terminals integrated with ABS modules, check their electrical operation and the absence of controller errors.
ABS module – what to look for when buying a used one?
The ABS module is an electronic component that controls the operation of the braking system, preventing the wheels from locking during braking. When buying a used ABS module:
- Check whether the module comes from a vehicle without damage to the ABS system and whether it is compatible with our car model.
- Verify the condition of the electronics and the absence of diagnostic errors.
FAQ - Questions from drivers and mechanics
| Question | Answer |
|---|---|
| Can I buy second hand bmw e90 discs? | Yes, provided that their thickness is > min., no runout or cracks. The manufacturer code and origin should be checked - preferably OEM. |
| What to check in BMW E87 / F30 / X3 E83 brake discs? | Verification: thickness, run-out, cracks and condition of the ventilation rim. Avoid tracks with deep corrosion. |
| How to check BMW X3 E83 front brake discs without disassembly? | Using a run-out sensor – also possible with a mounted disc and slight rotation – the difference should be |
What to look for when purchasing brake components from Global Parts?
- Used brake system components (discs, calipers, ABS module) offer an attractive price-quality ratio, especially for BMW models (E90, F30, E87, X3 E83/F25), Audi A3 8P and others.
- BMW E90 front/rear discs, F30 brake discs, E87, X3 E83/F25, Audi A3 8P rear discs – perfect provided the checklist is followed.
- Clamps – from a reliable source, tested.
- ABS sensors and modules – efficiency tested on computer. When you buy wisely, used brake system equipment from Global Parts allows you to combine safety, economy, and ecology without sacrificing OEM quality.