IT DOES NOT DRAW VACUUM FROM THE ATMOSPHERE, IT GET VACUUM PRESSURE FROM THE MANIFOLD OR SOMEWHERE ELSE ON THE INTAKE CREATING VACUUM PRESSURE FROM THE PISTONS PULLING AIR IN ON THE INTAKE STROKE OR IN A SUPERCHARGED ENGINE YOU NEED TO GET VACUUM FROM THE FRONT OF THE SUPERCHARGER SINCE YOU HAVE A POSITIVE PRESSURE INDUCTION SYSTEM RATHER THAN A NEGATIVE PRESSURE INDUCTION SYSTEM.
I realise this is old, but have to correct this statement. It does draw atmospheric pressure from the pedal side, as that's how you get the differential pressure. When the pedal is not engaged, both sides are at vacuum pressure, so the force is equal, you need the differential to get the vacuum assist and brake boosting.
I have an interesting problem. my brake assist is great and no issues there but when I sit in the car and try to start the car the very first time (cold start) I have to really press hard on my brake for the ignition switch push start to get enabled for the car to start . However, once I get the car started, the brake works completely fine and when I stop and turn the engine off, I can start it again without applying too much pressure on the brake pedal, but if I leave the vehicle and come back after an hour and then try to start the car again, I have to really press hard on the brakes For the ignition switch to get enabled. At first, I thought my break switch was going bad, but it is not. Can you guide me what the problem could be? I did replace my check valve, but that did not change anything. It seems like I am supposed to have vacuum in the booster, but for some reason, the vacuum escapes after like 30-40mins. I’m not sure what else is supposed to keep the vacuum inside the booster beside the check valve. Please help.
I am having the same issue. Do you happen to have a BMW of some sort? I have a 2010 528i and what you described is exactly what was happening to mine. Now it says the break/stability system malfunctioning. The fox I researched is spacing or replacing ABS break sensors and cleaning damaged rotors.
i bought a new jegs brake booster and master cylinder, i renew all the hoses, drums, and pads with lines, and there is no any leaking, my engine is 4.3 stock with holley sniper 1. I wonder why it happened sometimes, for example i drove about 45 min without any problem, when i wanted to park my car, suddenly i lose a brake and become stiff and immediately i push it again came back to normal. I did all of your test and could not find problems, as i said sometimes it will happen.
Your intermittent brake issue could be due to a faulty brake booster or vacuum leak, so check the installation and connections. Ensure the master cylinder is properly bled and check for air bubbles or contamination in the brake fluid. Verify that the calipers aren’t sticking and that all brake lines are clear and properly connected. Also, inspect for any electrical or sensor issues if applicable. If the problem persists, consulting a professional mechanic for a thorough diagnosis might be necessary. Hope this helps. Good Luck!
Check your manifold vacuum. If you're not getting enough vac it may take a couple pumps to build. Especially after a a period of wide open throttle or heavy acceleration Hope this helps. If your not getting enough vac, check for leaks and ensure carb is dialed in.
It goes back to normal because it builds vac at idle. You can feel that when you first start a vehicle up. They take a few seconds to build vac at idle.
Break pedal is released but still brake is applied slightly what could be the issue This happens randomly and the issue resolves temporarily when pressed brake pedal couple of times
When I press the brake pedal, it is hard and difficult to start the car (on the next day)? but the brake can stop the car normally.... does anyone know the problem?
That sounds like a booster or a check valve. If you want to check the booster, start the car and let it idle for about 30 seconds to a minute until it builds brake pressure (vacume). Then apply the brakes and cut the car off. If your foot moves while the car is off, you have a bad booster and it's leaking somewhere. To test the check valve it's super easy, it's a one-way valve. Blow are in both ways. It should be blocked on one end of the valve, if not, then it's your check valve
The symptoms described, including a hard brake pedal and difficulty starting the vehicle, may indicate an underlying issue with the brake booster, which relies on engine vacuum to function effectively. A malfunctioning brake booster can create a stiff pedal due to insufficient assist, potentially linked to a vacuum leak in the intake system. Additionally, issues with the vehicle's battery or alternator could contribute to starting difficulties, as a weak battery may not provide adequate power for ignition. Good Luck!
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IT DOES NOT DRAW VACUUM FROM THE ATMOSPHERE, IT GET VACUUM PRESSURE FROM THE MANIFOLD OR SOMEWHERE ELSE ON THE INTAKE CREATING VACUUM PRESSURE FROM THE PISTONS PULLING AIR IN ON THE INTAKE STROKE OR IN A SUPERCHARGED ENGINE YOU NEED TO GET VACUUM FROM THE FRONT OF THE SUPERCHARGER SINCE YOU HAVE A POSITIVE PRESSURE INDUCTION SYSTEM RATHER THAN A NEGATIVE PRESSURE INDUCTION SYSTEM.
Thank you for the comment.
So if it doesn't get air from the atmosphere there must be canned air. Guess thief's got mine
That's not what he said. Typing in caps doesn't make you correct
I realise this is old, but have to correct this statement.
It does draw atmospheric pressure from the pedal side, as that's how you get the differential pressure. When the pedal is not engaged, both sides are at vacuum pressure, so the force is equal, you need the differential to get the vacuum assist and brake boosting.
I have an interesting problem. my brake assist is great and no issues there but when I sit in the car and try to start the car the very first time (cold start) I have to really press hard on my brake for the ignition switch push start to get enabled for the car to start . However, once I get the car started, the brake works completely fine and when I stop and turn the engine off, I can start it again without applying too much pressure on the brake pedal, but if I leave the vehicle and come back after an hour and then try to start the car again, I have to really press hard on the brakes For the ignition switch to get enabled. At first, I thought my break switch was going bad, but it is not. Can you guide me what the problem could be? I did replace my check valve, but that did not change anything. It seems like I am supposed to have vacuum in the booster, but for some reason, the vacuum escapes after like 30-40mins. I’m not sure what else is supposed to keep the vacuum inside the booster beside the check valve. Please help.
I am having the same issue. Do you happen to have a BMW of some sort? I have a 2010 528i and what you described is exactly what was happening to mine. Now it says the break/stability system malfunctioning. The fox I researched is spacing or replacing ABS break sensors and cleaning damaged rotors.
Thank you for sharing 👍 😊
What about a hissing sound from inside the car by the brakes
i bought a new jegs brake booster and master cylinder, i renew all the hoses, drums, and pads with lines, and there is no any leaking, my engine is 4.3 stock with holley sniper 1. I wonder why it happened sometimes, for example i drove about 45 min without any problem, when i wanted to park my car, suddenly i lose a brake and become stiff and immediately i push it again came back to normal. I did all of your test and could not find problems, as i said sometimes it will happen.
Your intermittent brake issue could be due to a faulty brake booster or vacuum leak, so check the installation and connections. Ensure the master cylinder is properly bled and check for air bubbles or contamination in the brake fluid. Verify that the calipers aren’t sticking and that all brake lines are clear and properly connected. Also, inspect for any electrical or sensor issues if applicable. If the problem persists, consulting a professional mechanic for a thorough diagnosis might be necessary. Hope this helps. Good Luck!
Check your manifold vacuum. If you're not getting enough vac it may take a couple pumps to build. Especially after a a period of wide open throttle or heavy acceleration
Hope this helps. If your not getting enough vac, check for leaks and ensure carb is dialed in.
It goes back to normal because it builds vac at idle. You can feel that when you first start a vehicle up. They take a few seconds to build vac at idle.
Break pedal is released but still brake is applied slightly what could be the issue
This happens randomly and the issue resolves temporarily when pressed brake pedal couple of times
Ford Edge defect 😕
Press the spongy brakes and you hear a sucking or hissing sound. I guess that is the faulty vacuum .
Thank you for your feedback.
When I press the brake pedal, it is hard and difficult to start the car (on the next day)? but the brake can stop the car normally.... does anyone know the problem?
That sounds like a booster or a check valve.
If you want to check the booster, start the car and let it idle for about 30 seconds to a minute until it builds brake pressure (vacume). Then apply the brakes and cut the car off. If your foot moves while the car is off, you have a bad booster and it's leaking somewhere.
To test the check valve it's super easy, it's a one-way valve. Blow are in both ways. It should be blocked on one end of the valve, if not, then it's your check valve
The symptoms described, including a hard brake pedal and difficulty starting the vehicle, may indicate an underlying issue with the brake booster, which relies on engine vacuum to function effectively. A malfunctioning brake booster can create a stiff pedal due to insufficient assist, potentially linked to a vacuum leak in the intake system. Additionally, issues with the vehicle's battery or alternator could contribute to starting difficulties, as a weak battery may not provide adequate power for ignition. Good Luck!
👍
Let my ex drive my genesis coupe and it had a faulty brake booster andddddddd she crashed it
Brake pedal can be hard to press without the brake booster. I am sorry about the car crash. Thank you for sharing.
My genesis has same problem I think it's missing the valve booster
Sound of rushing air?
Yes. Thank you for sharing.
bad explanations
Thank you for your feedback.