You can pump it a few times because the brakes are made to work for a short period of time even if the car suddenly shuts off while in motion, so you don't get into an accident from the stiff pedal that occurs after a few pumps (A LOT more effort required to slow down the car). The reason the pedal gets stiff is because the power brake system has no leftover pressure to use. That means that you're basically working with a manual brake system, where you need to push much harder to get the brakes to clamp down (you're creating the brake pressure on the brakes with your foot at this point, not the power brake system). All of this is perfectly normal.Originally posted by Chazza
But after I turn the engine off and press the brake a few times (to get rid of the vacuum braking), the brake pedal becomes extremely tight. It won't even budge 1 or 2 cm's even when pressing it quite hard. Wouldn't this imply that there isn't any air in the pipes?=
I'll try this test tomorrow...So just push it about half way down and see if it starts to sink with the same amount of pressure applied?marcus_GTS said:To check for a small leak, push the pedal in hard and hold it with a constant force. If the pedal starts sinking, there's a leak!
Yes, do this test.Chazza said:I'll try this test tomorrow...So just push it about half way down and see if it starts to sink with the same amount of pressure applied?
autxr said:On a related note, have you done any work to the brake system recently? Maybe removed the calipers for painting, done a clutch job (it shares the brake fluid), installed stainless lines, etc.