This can prevent operation by causing it to stick and even stay open. Some attract ions of copper while others are eaten away.įor a valve in the ABS modulator, the ions can plate the pintles and seats. Since the ABS modulator has different metals, they act as anodes and cathodes. ![]() As the brake fluid corrodes the lines that are brazed with copper and the ferrous components, ions of the metals are release into the fluid. The main cause of these issues is the valve seats and pintles can become stuck or not seat properly due to debris, corrosion or contaminated brake fluid.Ĭorrosion results in the depletion of the buffers and anti-corrosion additives in the brake fluid, as the ABS modulator has a variety of metals in close contact. Common complaints often include pulling brakes, long stops and low brake pedal. ![]() ![]() The signs of a malfunctioning ABS modulator can mimic problems with calipers, brake hoses or the master cylinder.
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