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What is causing the brake pedal to sink slowly to the floor in my 2016 Holden Colorado?

Asked by Tony

What is causing the brake pedal to sink slowly to the floor in my 2016 Colorado?

Answered by CarsGuide

18 Sep 2020 David Morley

There are three classic causes of a sinking brake pedal. The first is a worn out brake master cylinder that is allowing brake fluid back past the actuating piston. The second is a leak somewhere in the braking system, either a caliper itself or a brake line or union and, the third is an ABS system fault where the ABS pump isn’t working properly, usually due to a low brake-fluid level.

Regardless of the cause, there’s no `acceptable tolerance’ for a brake pedal that slowly sinks towards the floor. A braking system in good working order should be able to hold the brake pedal at the same level more or less indefinitely. Any sinking is bad news and is a serious safety issue. I wouldn’t even have the car towed to a workshop; it’s simply not safe to drive.

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