GeorgiaJeeper93 Posted December 31, 2015 Share Posted December 31, 2015 So my 86 mj finally moved under its own power for the first time since 2006. Problem is, I discovered that I have no brakes. Only a the sound of air as the pedal goes all the way to the floor. I did a search on here which got me thinking maybe my booster is shot. I noticed the booster is leaking something. smells like gas but that has me really confused. Thoughts? Link to comment Share on other sites More sharing options...
87MJTIM Posted January 1, 2016 Share Posted January 1, 2016 It terrible when no one cuts me a break, especially when my truck has no brakes Link to comment Share on other sites More sharing options...
GeorgiaJeeper93 Posted January 1, 2016 Author Share Posted January 1, 2016 Lol excuse my poor spelling. Link to comment Share on other sites More sharing options...
GeorgiaJeeper93 Posted January 1, 2016 Author Share Posted January 1, 2016 Anyways, someone for whatever reason put gas in the master cylinder. I can only imagine what kind of damage that has caused. Link to comment Share on other sites More sharing options...
87MJTIM Posted January 1, 2016 Share Posted January 1, 2016 Sorry, I could not resist. BTW, English was my foreign language in school. With the hissing sound, I would say you booster is shot. The master may also be allowing fluid to pass the piston. So both may need to be replaced. If the master and booster are original, you could look into do a master/booster upgrade from a 95-96 XJ. This will involve a total bleeding of the system. If you still have the by-pass valve, there are multiple bleeding steps to perform. Search the DIY section on how to perform the steps. Good luck. Again, sorry 'bout that, Chief. Link to comment Share on other sites More sharing options...
Eagle Posted January 1, 2016 Share Posted January 1, 2016 Anyways, someone for whatever reason put gas in the master cylinder. I can only imagine what kind of damage that has caused. Assuming you weren't kidding wit this post, unfortunately you have some work ahead of you. You should replace every rubber part in the brake system. That means a new master cylinder, new (or rebuilt) calipers, new (or rebuilt) rear wheel cylinders, and new rubber flex hoses at the front and rear axles. I don't know what to advise if your truck still has the rear height sensing valve. I had one of those explode on me in a panic stop and mine had NOT been contaminated with any other kind of fluid. If yours has had gasoline run through it, you might feel comfortable replacing everything else and bleeding the system in the hope that the gasoline didn't spend any time in the height sensing valve. I don't know how comfortable I would be with that assumption, but I'm inherently risk-aversive. Link to comment Share on other sites More sharing options...
GeorgiaJeeper93 Posted January 1, 2016 Author Share Posted January 1, 2016 Unfortunately I am not kidding. Someone actually put gasoline in the master cylinder. I will definitely be replacing all of that. I think I will take the last posters advice and also swap out the booster and master cylinder from an xj while I'm at it. Link to comment Share on other sites More sharing options...
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