2007-09-20 14:35:58 · 4 answers · asked by danchevy 1 in Cars & Transportation ➔ Maintenance & Repairs
Vacuum leak my good man not air leak. You will hear a vacuum sucking noise every time you stomp on the brakes but usually only on newer cars or new brake boosters.
The hose on the booster is connected to the intake manifold and in older cars the back on the carburetor. This sucks the air out of the booster and there is a check valve that keeps the air moving out of the booster and not back in.
In your case this check valve, that is typically pushed into the booster and has a rubber grommet to make the seal air tight, may be leaking or the rubber grommet is compromised letting the vacuum suck air. If this is the case you usually feel an easy push followed by a hard push and so on when you push the brake pedal with the engine running since you have some boost fading in and out but not 100%.
The internal diaphram can eventually fail and you'll have a hard pedal (no power boost) and sucking constantly when you hit the brake pedal.
Also, if there is too much travel in the pedal from a leak somewhere in the hydraulic brake system then the same thing will happen only the brake pedal will be soft and travel too far when pushed.
Good Luck!
2007-09-20 15:01:56 · answer #1 · answered by CactiJoe 7 · 0⤊ 0⤋
this isn't as bad as your thinking, but as for rebuilding yours, don't try it. this is an easy fix, you just need to take the 2 bolts off the master cylinder and pull it away from the booster if you can, but you may need to take the 2 brake lines off as well but in most cases you do not have to, and take the vacuum hose off coming from the manifold and then there's a clip on the brake pedal and 4 nuts on the fire wall under the dash, then just pull out slow and its yours. the booster should cost you about $140.oo for a new one and $100.oo for a rebuilt one. i just did one about 3 months ago on the same truck, will a 95 but the same all in all. if you have to pull the master cylinder you'll have to bleed the brakes, and always start with the wheel closer to the master cylinder first and work your way away from it from there
2016-05-19 21:50:46 · answer #2 · answered by ? 3 · 0⤊ 0⤋
Then it's definately time to replace the booster. You can try to find the replacement seals and find a way to open it up without the special tool, but the easiest way is to buy a rebuilt booster.
Rick
I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology. Visit my blog for cool articles and TSB's: http://free-auto-repair-advice.blogspot.com
2007-09-20 14:46:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
bad hose or booster just replace it
2007-09-20 14:51:12 · answer #4 · answered by goat 5 · 0⤊ 0⤋