SOLVED: 1993 4wd. Why aren't brakes working?

Detail: I have changed brakes rotors master cylinders and wheel cylinder and my brakes still aren't working
Detail Question SOLVED: 1993 4wd. Why aren't brakes working?

Solution: Does the brake pedal go to the floor? Or does it stay up, and is hard to push...? Did you bleed the master cylinder? Also, you will need to bleed all 4 wheels connection to the brake wheel cylinders...you must start with the rear, farthest from the master cylinder, then other rear, then front farthest from the master cylinder, then other front...the bleeding of each line is a must, since you switched the master cylinder. , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck! , There is a level switch in the master cylinder if the fluid level is low it will turn on the light and If you pressure or vacuum bleed the brakes you will center the proporting valve switch that warns of low brake pressure in either Front or rear. Vacuum bleeding I have found to work the best. Make sure the Park brake lever is all the way released. If you find this informationn helpful please leave me a favorable rating and by all means contact me if I can be of any further help. www.aceautomotive1.com , Try a clean and adjust on the rear shoes, because sometimes when they aren't properly adjusted they won't seem to work properly. Also there is a common "squishy" petal feeling after brake work on most all larger GM's around that year, wich I have run into several times. Try test driving it, and put a couple miles on it, That usualy helps. Good luck! , Is your 4x4 light coming on? Does the shifter move smoothly into position? I have a 95 that I have just about had every proplem imaginable. Need morre info. John. , if you didn't bleed the lines after putting the master in. then there is a good chance there is air in the lines now. may go through a quart of brake fluid before all the air is out. remember to start at r-rear/ l-rear/ r-front/ l-front last.will take some time. don't forget to adjust the rear brake while your there to help with the pedal , One of the wheel cylinders is leaking, pulling air back into brake system and it's going back to the4 master cylinder. Look for brake fluid leaking at one of the wheel cylinders, that's where the problem is.

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