ByFlygo
Hello, since I changed my brake fluid the brake pedal has become hard overnight without being pressed.
When I start the engine the pedal gives way normally.
Can the brake fluid change damage the brake system? Before, the brake pedal never became hard overnight.
LG
Opel Astra GCC X16SZR
(1 votes)
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Salmon
The brake servo works with negative pressure. This arises when the engine runs in the intake. If the engine is standing, the brake pedal can be actuated with the brake aid once or twice. After that, the vacuum is reduced, the pedal becomes hard. Brakes (for example when dragging) are still correct, but it takes a lot more pedal pressure.
On a new car everything is so dense that the vacuum remains overnight. If everything is older, it can be that the vacuum escapes with the hours. Then the pedal is hard in the morning until the engine returns negative pressure.
If the brake support works correctly during the ride, the leak is very small and the car can be used safely.
I recommend that you check the vacuum hose and its connections. This small hose connects the vacuum plug (large and round in the master brake cylinder) to the intake of the motor. Maybe it was briefly pulled off for the brake fluid and then put on again. Rubber hoses also age and maybe he has become brittle.
Tellenone
Image: Vacuum plug
That sounds like normal behavior. If you actuate the brake after turning off the engine, it becomes hard. As soon as the engine runs, the BKV gets vacuum and the pedal drops a little. The fact that this was not the case before is more likely to mean that the brake fluid change was necessary and/or that air was in the brake system.
I didn’t know what to do, at least when the car was older. The brake booster then does not hold the vacuum overnight, that is normal. When starting the engine, the pedal will then pass.
today after the night he kept the pressure time it seems to be always different, I don’t mind it anymore as long as the brake works normally.
lg
If the vacuum leaves with time, something is leaking. With the change of the brake fluid this can have nothing to do.
shouldn’t the brake be hard when driving?
can it be at low temperatures?
lg
as soon as the engine ventilates vacuum is generated and thus the BKV can work if somewhere a small leak is disappearing overnight the vacuum.
This can lie on a defective check valve or a leakproof hose
possibly check the seals of the vacuum pump or the hose to the BKV.
shouldn’t the brake be hard when driving?
can it be at low temperatures?
lg
If the vacuum pump provides enough vacuum during operation that the small loss is negligible, it can be that you do not notice anything during the ride.