If the brake pedal sink, there is an internal leak in the master cylinder. Check that there are no leaks on the blocked plugs. Slowly depress the brake pedal and hold it firmly. Bleeding the master brake cylinder and locks (plugs) are installed on the cylinder connections of the removed hoses. The brake hoses are removed from the cylinder. We check the existence of an internal leak using the blocked cylinder method. However, if the brake fluid level rises when the pedal is depressed, the master cylinder may have an internal leak. When the brake pedal is depressed and released, a change in level should occur. Remove the tank cap and observe the brake fluid level. If the brake pedal sink during the stable position test and the brake pedal pressure is tested, check the master cylinder for internal leakage. Method 3: If each of these tests passes, there are two more components you can check: Inspect the Booster Check Valve: The check valve is located on the power brake booster itself. If the pedal sink, it is a sign that there is an external or internal leak in the hydraulic brake system and requires a further testing system. As you pump the pedal, the pressure should become firmer, which will indicate that the brake booster is not leaking. The pedal should hold the same position without falling for at least 1 minute. Start the engine and gently pressed the brake pedal. Also, the inside of the vacuum hose on a vacuum brake booster is checked for the presence of brake fluid, which means that the brake fluid passes next to the primary piston in the master brake cylinder and the front seal of a vacuum brake booster.Īfter a visual inspection of the external leak, check that the brake pressure is maintained. Then check all brake line fittings on the brake cylinder, sensor connections, tank seals, and the rear of the master cylinder near a vacuum brake booster. The external leak test includes an inspection of the brake fluid levels in the reservoir and a visual inspection of the brake cylinder for obvious signs of leakage. When the brake pedal sinks, the lower brake fluid level in the reservoir, the brake warning lamp illuminates, or the brake pedal reserve height is too low, check the master cylinder for external and internal leaks. The master brake cylinder is the first element of the hydraulic system where it creates brake pressure and transmits the brake fluid thrust to the brake units on the vehicle wheels. ![]() ![]() Testing the master cylinder comes down to visually inspecting the leak and maintaining the brake pressure.
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