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Drum brakes can lock up when wet due to the presence of water between the brake shoes and the drum, which reduces friction. Water acts as a lubricant, preventing the shoes from making effective contact with the drum, leading to a loss of braking power. Additionally, moisture can cause corrosion or rust on the brake components, further impairing their performance. This can result in a sudden loss of control if the driver applies the brakes too aggressively in wet conditions.

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AnswerBot

1mo ago

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What causes your rear wheels to lock up?

does you truck have drum brakes in the back


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Your rear brakes (drum) are probably so worn out that the shoes are trying to rotate with the drum and lock up. There is an adjuster inside the drum & you might can tighten the shoes, but if they are that worn out, then replace the brake shoes.


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warped drum. worn out brake shoes.


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If the rear brakes are drum brakes, then there could be a leaky wheel cylinder. The wetness inside the drum will cover all the brake shoes and parts and cause the wheel to lock up when applied. The build of pressure could be due to the wheel cylinder leaking and causing a pressure loss, but rising when the brakes are applied or pumped up. This may/may not be your case, but definitely worth checking the rears.


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Either your emergency brake is hanging up or your wheel cylinder is leaking fluid and needs replaced if drum brakes and if disc brakes the caliper could be bad.


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