Engine Diagnostics in Calgary, AB

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When a vehicle is functioning correctly, it should maintain a straight path during deceleration. If the steering wheel tugs to one side or the vehicle drifts toward the shoulder when you press the brake pedal, it is a clear indication of an imbalance in the braking or suspension system. This phenomenon is not merely an annoyance; it is a sign that one side of the vehicle is providing more stopping force than the other, or that the mechanical geometry of the car is compromised. The Primary Culprits of Brake Pulling Understanding why this occurs requires a look at how hydraulic and mechanical forces work together to stop a vehicle weighing several thousand pounds. 1. A Seized or "Stuck" Brake Caliper The brake caliper is the component that houses the brake pads and uses hydraulic pressure to squeeze them against the rotor. Inside the caliper is a piston. Over time, road grime, rust, or heat can cause this piston to seize. If the left caliper is seized: It may not apply pressure at all, causing the right side to do all the work. Consequently, the car pulls to the right. If the caliper is stuck "on": It might stay partially applied even when you are not braking, leading to extreme heat and a pull toward that side during operation. 2. A Collapsed Internal Brake Hose While the exterior of a brake hose might look fine, the internal lining can collapse. This creates a "one-way valve" effect. Brake fluid is forced into the caliper under high pressure when you step on the pedal, but it cannot return easily. This causes the brake on that side to stay applied longer than the other, resulting in a distinct pull. 3. Contaminated Brake Pads Brake pads require a specific coefficient of friction to work. If oil, grease, or leaking brake fluid gets onto the surface of the pads on one side of the car, those pads will lose their "bite." When you brake, the "clean" side will grab effectively while the "contaminated" side slides, pulling the car toward the side that is still working correctly. Comparing Causes of Pulling: At a Glance The following table outlines the most common reasons for a vehicle pulling during braking and how a technician identifies the root cause.