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Did you use a vacuum bleeder device? Or, if you have a second person, you can have them press the brake pedal to the floor while you open the bleeder valve. Then close the valve and tell your partner to release the brake. Repeat as often as necessary until your fluid is coming out clear.
seems that your brake booster is leaking, diconect vacum hose to brake booster and pluged press your brake pedal, noise is gone? there you found it you need a new booster, may be hard to find? dont know make sure when your replace it, to mesure the length of front rod or you end up locking up your brakes after a short drive,
hope it helps
If it sounds like rushing air when you hit the brakes I would suspect the vacuum booster first. There is no air venting through the master cylinder but the booster is connected to a vacuum line. Kind of a pain in the *** to change, you have to remove the master cylinder, then get up underneath the dash and remove the bolts which go through the firewall and hold the booster. You may also have to disconnect the actuating rod which connects to the brake pedal arm. I would toss in a new master cylinder too when you put it back together. Do not put a used wear item in your vehicle unless you want to do the job again soon.
HI this sounds like the vacuum booster has a leak in the diaphragm. That is why you hear that sound when you push on the brake pedal. With out the vacuum to help this leaves you with a very stiff brake pedal. You will need to replace the Booster which is located behind the brake master cylinder and on the firewall. Good luck
well, you don't really hear air when you press the brake pedal. You might hear hydraulic fluid going through the valves in the master cylinder, that sounds like air flowing through a vent. But, I assure you, it is not air.
One can press and pump on the pedal when the car is off and hear the 'rush' of fluid which sounds kind of like air rushing out of an inner tube.
It's a common mistake to believe a rush of air is being heard when pushing on the brake pedal.
Your having a problem with the vacuum booster,check the hose connection at the booster,if the hose is fine the diaphram in the booster is leaking and about to fail.
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