Brake Bleeding MC

[Mooser]

After sitting forever (not my fault honest) my rear tank on the master cylinder was bone dry empty. I figure it leaked out the back somewhere, brakes on this have never been great, have ordered the o-ring conversion set. Probably install this winter.

I bought a Motive pressure bleeder after reading lots of positive reviews and was just wondering...
I should have to bleed the master since it went empty but do I need to remove it and bench bleed or will the pressure bleed take care of the master cylinder also?
Thanks
Mooser

 

[Vettehead Mikey]

Find the source of the leak first. Otherwise you're just wasting time. The master will need to be re-bled, but this can be done in situ.

 

[Rex S]

Yep, find the leak first! If you see nothing on the calipers, pull the M/C and look in the power booster.

 

[Mooser]

Hard to Find

Going to be hard to find, the car was at the body shop for 2+ years and then sat here for another 4+ years everything is dry (calipers, master, frame, lines, etc. Figure it's easier to bleed the system and then start hunting when/if it starts leaking again.
Since I need to bleed the master I might as well pull it off and have a look at the booster while I'm there.
New master+booster looks like just over 200 bucks, maybe best to replace it anyways
Thanks
Mooser

 

[Rex S]

Might as well do it right, M/C, booster, calipers & hoses. If its been sitting that long and ? how long it was empty. The empty side is going to have rust all through it so look at the lines too.

 

[6880 Mike]

Junk the master cylinder. Obviously there has been a leak. When you pull it, check the booster to determine whether the MC leaked out the back and into the booster. Bench bleed the replacement master cylinder before you install it.

 

[Mooser]

Yup Booster full of fluid, new master and booster ordered.
Then to add to the pain I pulled off all the calipers (going to change over to the o-rings now since everything is apart.
One caliper isn't stainless sleeved... Looks like bronze or something.
Can't win, can't loose, can't quit the game....
Anyway, thanks for the heads-up on the booster

Mooser

 

[Crimson Thunder]

Sorry to resurrect an old thread but my MC was bone dry in the back section last time I drove it. Tomorrow i'm going to check it out to try and find the leak. My car does not have power brakes so can I expect to find brake fluid on my drivers side carpet?

 

[JohnZ]

Sorry to resurrect an old thread but my MC was bone dry in the back section last time I drove it. Tomorrow i'm going to check it out to try and find the leak. My car does not have power brakes so can I expect to find brake fluid on my drivers side carpet?

Only if you don't find a leak anywhere else; the missing fluid is going somewhere.