Where is the brake booster located on the 93 grand voyager. I looked at the part on line but dont see it anywhere near the master cylinder

SOURCE: 1997 Jeep Grand Cherokee, hear air bubbling out

First, inspect all lines and fittings for seepage. If fluid is getting out anywhere, air is entering system as well. Fill the master cylinder and bleed it first. Make sure that when bleeding someone is holding pedal down until after you have closed each bleeder screw.(applies to all bleeders). Bleed the right rear, then l/r, r/f then l/f. While doing this keep checking master to make sure it does not run dry at any point. Make sure that at each wheel there is no more air coming out before you continue on to next one. Sometimes if there is an excessive amount of air, it's good to go around to each wheel twice.(use a small box wrench on bleeders if possible so you can actually see what's coming out.(Another way of doing this is to use a small section of plastic tubing like fish tank air hose, and attach it to end of bleeder (sometimes if hose is too small, it can be warmed in hot water so it expands over nipple.) put the free end in a glass jar with some fluid in it, keeping the hose in the fluid to prevent air from entering, using this method abslolutely prevents air from getting into system while bleeding)
Other causes of low pedal are worn rotors or drums and improperly adjusted rear brakes. If you have ABS, all of this applies but there may be a problem with abs system (usually will turn on abs warning light)
good luck

SOURCE: Fiat Uno Pacer - Brake Booster not assist braking

it could be that the master cylinder is bad or the brake booster is bad also check the vacum hose going to the brake booster if it has a hole in it it will lose pressure and make the engine lose rpms

SOURCE: How much would it cost to replace the master

this is big job. I recommend to buy a used master cylinder from junkyard. It will cost around 50 dollars. if you buy it new it will cost more than 160 dollars. The labor cost will be more that that. If you know how to work in car. I can show you step by step how to remove it and replace it. Let me know if you want to do that. If you like this solution, please click accept

SOURCE: master cylinder removal 93 ford ranger

lay some old rags under it before you remove it or get old turkey baseter that you will never use again and drain it out that way have a countainer ready.Note fluid and baseter no longer fit for use!

SOURCE: New master cylinder and booster. Brakes stop good

Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.