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Why Your BMW's Brake Calliper Keeps Sticking (And What's Usually Really Causing It)

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Image: BMW X3 Series Complete Brake Calliper Set for Sale at MT Auto Parts One wheel gets hot when the others do not. The car pulls slightly to one side under braking. You notice a faint burning smell after a motorway run, or a scraping noise that appears only on one corner. You might be told you need a new BMW brake calliper . Sometimes you do. But a sticking BMW brake calliper is one of those faults where the calliper itself is often not the original problem. It is what happens to the calliper when something else has been neglected. Understanding the real cause saves money and stops the fault coming back. How a Brake Calliper Works The calliper clamps the brake disc when you press the pedal. Inside it are one or more pistons, hydraulically pushed outward by brake fluid pressure when you brake, forcing the pads against the disc. When you release the pedal, the pressure drops and the pistons retract slightly, allowing the pads to release. That retraction is small and deliberate. The p...
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That Rough Idle Might Be Your BMW's MAF Sensor

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Image: BMW 3 Series Genuine N57 Engine Air Mass Flow Sensor for sale at MT Auto Parts for £37.42 A rough idle. Poor fuel economy that has crept up over a few months. The engine hesitating under load or feeling flat when you accelerate. These are the symptoms that bring BMW owners to search for answers, and the BMW MAF sensor is one of the more common culprits that does not always trigger an obvious warning light. The mass airflow sensor is a small and relatively inexpensive component. When it is working correctly, you never think about it. When it is not, the effects run through almost every aspect of how the engine behaves. This guide covers what it does, how to identify when it is failing, and what to do about it. What the MAF Sensor Does The BMW mass airflow sensor sits in the intake pipe between the air filter and the throttle body. Every bit of air entering the engine passes through it. The sensor measures the volume and density of that air, continuously, in real time, and sends...
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Location: United Kingdom
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What Happens If Your BMW Airbag Fails? A Straightforward Explainer

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  Image: BMW X5 Series M Sport Steering Wheel Airbag for Sale at MT Auto Parts The airbag warning light comes on, and most BMW owners do the same thing: note it, intend to deal with it, and carry on driving. It is easy to treat it as one of those amber lights that probably means something minor. It is not. An airbag fault means the system may not deploy correctly in a crash, or in some cases, may deploy unexpectedly when it should not. Neither outcome is minor. This guide explains how BMW airbags work, what faults look like, what the ongoing Takata recall situation means for older cars, and what replacement actually involves. How BMW Airbags Work A modern BMW has a network of airbags managed by a central restraints control module, sometimes called the airbag module or SRS module. This unit continuously monitors crash sensors, seat occupancy sensors, and the readiness of every pyrotechnic component in the system. In a collision, the system has milliseconds to decide which airbags...
Location: United Kingdom
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5 Things Nobody Tells You Before Buying a 3 Series

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  Photo by Fabian Albert on Unsplash The 3 Series is one of the most recommended used cars in the UK, and for good reason. But most of what gets written about it covers the obvious stuff: which engine is fastest, which trim looks best, whether it's reliable. Less gets said about the things that actually catch new owners off guard once the car is sitting on their driveway. 1. The Engine Matters More Than the Trim Level It's tempting to shop by trim, M Sport versus SE versus Luxury, but the engine underneath does more to determine what ownership actually feels like than the badge on the boot. A run-of-the-mill SE with a B58 straight-six will typically cost you less to keep on the road than an M Sport with an early N47 diesel that's due a timing chain replacement. Trim affects how the car looks and feels; engine affects what it costs you over the next five years. This matters because two cars with an identical trim badge, say two M Sport 320d models from different production y...
Location: United Kingdom
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