SnyderMan

Hello everyone! I'm a new jeep owner and fairly new to working on my own vehicles.
I'm in the process of upgrading the front calipers, pads, and rotors on my '93 XJ daily driver. After putting everything back together and bleeding the brakes, took it for a quick drive and lost all pressure in the pedal. I've done brakes several times now and have never had this problem, nor did I have any problems with a spongy pedal before doing the work. I re-bled the brakes, front and back, and still no pressure in the pedal. I can't find any obvious leaks anywhere in the system.
Is there something I'm missing or could my MC have actually gone bad just that quick?? Any suggestions before I go buy a new MC??
Thanks!!!

00t444e

You can pull the master cylinder and see if it is leaking internally. Sometimes they will leak back into the brake booster.

SnyderMan

Thanks, I might give that a try. Would that cause an air bubble to form in the reservoir? I did notice when I had the cover off that when my helper released the brakes an air bubble would pop up . . .

BlueRidgeMark

Check your calipers. You may have them on the wrong side, which puts the bleeder on the BOTTOM, and you can bleed till you grow old and die, and you still won't get the air out.

Bleeder screw should be on the top, above where the brake line comes in.

SnyderMan

I'm so glad you brought that up cuz I went and looked and that's exactly what I did! Such a dummy
Gonna go switch em around and hopefully that does the trick. I knew it would be a dumb mistake like that!
Thank you sir!

BlueRidgeMark

Second one of those in a week here! Its an easy mistake to make, because they are not marked in any way.

SnyderMan

Quick update, got it up and running perfectly now. And thanks again for the advice. Went and double checked my project XJ and I had installed them wrong there as well.

BlueRidgeMark

Glad to help!

Just noticed your location. My in-laws are your neighbors.