Newbie Brake Problem
Hello all I am new here on the forum and really could use some help. I have a a 1996 ZJ that I am trying to fix up back to its glory days I have put considerable amount of time and energy into this rig so far. I lifted it 3.5 inches with a Rock Country lift kit put a front stabilizer bar by Rock Country as well. I just finished installing a new rear end as the one that was on it was bent badly and could not be aligned properly at all. I have also spent alot of money and time on the Brake system for this as well I have a brand new Brake Booster, Brand new Master Cylinder, new rotors and pads all the way around the calipers were in great shape no faults found same with ABS components. When I bought the rig it had the brake light on and no stopping power at all so I replaced a lot of components mostly because I wanted it to be new add to the restoration of it. However I just had another Master cylinder installed because when the rear axle was installed yet again the brakes would not bleed and the pedal is weak and sinks to the floor. Now ever with all those new parts including another master cylinder installed it still has very weak pedal I went and bought new brake hoses all the way around but I am at wits end and could really use some help figuring out what is wrong with it because besides myself 3 other mechanics have not been able to fix this brake system fully yet. Any Ideas please after I replace these hoses the system is practically brand new all the way except the ABS Module but there are no codes showing unlike when I bought this Jeep.
When the vehicle is off there is pressure but when it is running the pedal sinks. When the brakes were bled there was no air coming out of the bleeder valves. I can stop the vehicle but if I have to slam on brakes forget it it will not stop. one person told me my brake hoses might be inflating that I should try replacing those so I bought new ones all round if this doesn't work I don't know what else it could be. Even the Jeep dealership can't figure this out for me they got the jeep to be able to stop but we still scratching our heads on the pedal feeling so weak ????
When durango-bob asked if you could pump it up with the pedal he meant does the pedal get stiffer if you pump it up and down several times. If so, it's a sign of air in the system. You can bleed all 4 wheels clear and still have air elsewhere in the system, especially if you've had the master cylinder off. The DRB scantool that the dealer has even has the ability to cycle the antilock brake valve for the purpose of getting air bubbles to move that may have lodged in there.
Originally Posted by kachink View Post
Originally Posted by Technohead View Post
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