The video shows a stream coming up from the bottom near where your hard lines attach to the frame below the steering shaft and hitting the bottom of the booster. I know this is 2 years old, did you ever fix it?
mines doing the same thing a friend told me to replace my brake booster since these supposedly don't have the traditional seal between the mater cylinder and the booster. Im not sure if they are right another friend a mechanic at walmart i work with said bull just replace the rubber seal at the master cylinder let me know what you think mine is a 99 gmc k1500 suburban with the same exact engine and setup as yours
ALL BOOSTERS ARE is a vacuum assist. There is a 3/4" ID vacuum hose from the intake manifold that connects to the booster, when you push the brakes pedal, the vacuum pulls the diaphragm inward, making it easier to push the pedal and gain a more controlled braking action. If that rubber diaphragm tears you will have smoke coming out the tail pipe and your exhaust vales will burn as you will suck brake fluid out of the master. ALL master cylinders have a seal at the back, but that vacum is strong and will suck the brake fluid past the seals.
HELLO I JUST FINSH WATCHING YOUR VIDEO ...YOU NEED TO CHANGE THE MASTER CYLINDER AND BOOTER TOO AND SOME NEW LINES DON'T FORGET TO BLEED ALL SYSTEM WITH NEW BRAK FULD ..GOOD LUCK
@@charlesbitherjr5895 Why replace the master cylinder? This is a hole in a brake line. The booster is not bad, just rusty. clean it up and spray it with Rutsoleum Bed-liner paint. Replace the bad line. Dont go spending $500.00 to $800.00 on hardware that isnt broken. God, you stick your hand down there and run it along each line while someone pumps the brakes slowly and you will find a pinhole or crack.
Brake fluid has a very high flash point. You can lite a match and toss it in a bottle and it will extinguish the match. If the motor isnt running you cant use the booster, you have to do it with the engine running.
That has more shit fluid you should get all that out do a brake flush you can tell master or booster is leaking get a new booster it all looks like shit id replace booster lines and cylinder at least the rusty lines
Hole in the brake line, not the booster there is not supposed to be any fluid in the booster. The master cylinder would empty out after two pumps at that rate. All the pumping you had your wife do, you should have topped off that master cylinder before you started. You probably emptied the master cylinder and sucked up a BUNCH of air and that's creates s big misty cloud coming out of the hole in the line. Anyway stick your hand down there and find the leak, which tube is broken. You can either cut a section out and replace a small section, or do the right thing and replace the line back to about the drivers seat under the truck if its the back brakes, if its the front, replace the entire line. It sounds like you don't have a huge amount of Technical skills so this may be a job for a shop or a friend that has the tools and knows how to splice brake lines. If you do it wrong you could die if your solution pops off under hard braking, like a Mack truck comes across the road in front of you.
Chevy hasn't used steel master cylinders since the 50's, so it would be hard for an aluminum master cylinder to rust out. The booster diaphragm is rusty, but that metal is about 1/4" thick, and there is no brake fluid in the booster unless the seal on the master goes. Thats a pin hole or fine crack in a brake line.
It's your booster. Had to replace mine at 198k. Hardest part is getting the clip off/ on at the pedal. Master cylinders don't rust like another poster said. The seals between the reservoir and cylinder will also go bad. If the pedal went to the floor then it's the booster. $90
JOHN E BOB did replacing the booster solve the pedal sinking . Mine is a 96 k1500 I got cut off slammed the brakes real hard and since then Ive had a hissing noise coming from the booster when my foots on the break I replaced my master cylinder and the pedal sinks and they are double pump breaks right now just wondering if the booster was your problem because before my breaking wasnt the best . I have one on order right now .
If the booster were the problem you wouldn't see fluid spraying out. The fluid is sucked into the intake via the 3/4" vacuum line from the intake manifold to the vacuum booster when the diaphragm tears causing the pedal to sink. Then the massive vacuum from the hole in the diaphragm sucks brake fluid past the seal at the back of the master cylinder and into the intake manifold and it gets burned. And if left long enough will bur the seats or seating face of the exhaust valves. Thats a cracked or pinhole brake line leak.
