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What causes sudden brake stiffness at lower temperatures?

1 Answers

StTeagan

07/29/25 10:26pm

The main reasons for sudden brake stiffness at lower temperatures are as follows: 1. Vacuum booster pump leakage or malfunction. It's important to know that the force we apply to the brake pedal is amplified by the brake booster pump. If it fails, braking becomes difficult, meaning what was previously assisted by the vacuum force of the brake booster now relies solely on foot pressure, a difference that's easily noticeable. 2. Pressing the brake after the engine has been turned off, which is also related to the brake booster pump. 3. The brake booster pump only continuously generates vacuum when the engine is running. When the engine is off, it relies solely on the residual vacuum assistance, which typically depletes after a few presses. However, this condition will be restored after restarting the engine and is not considered a malfunction.

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