What master cylinder do I need?

[keenkeener]

1968 Dodge Charger
Front Disc/rear drum (not sure if original to car or a retrofit)
Power Booster

Went to bleed my brakes and im not getting any pressure to the rear drums. Going to replace the MC. What master cylinder should I look for as a replacement. Parts stores have power MC, manual MC, drum MC, and disk/drum MC. What should I be looking for? I can get some pics if needed.

[bakerhillpins]

IIRC 68/9 use the same masters year to year. You will want to stick with a Disc/Drum MC as the ratio of pressure from front to rear is different. I also believe that power or not it is the same MC.  Here are a few links for you that might help you find a correct looking master.

http://www.dodgecharger.com/forum/index.php/topic,20456.0.html
http://www.dodgecharger.com/forum/index.php/topic,13667.0.html
http://www.dodgecharger.com/forum/index.php/topic,9884.0.html

Note that if the rear slave cylinder is locked up/frozen it could appear like you are not getting any pressure because you will not see any flow out of the bleeder nut. I had this on my 69 on the front slaves.

[keenkeener]

Good point about the stuck slave cylinders in the rear. I think its the only part of the brake system that hasnt been changed recently... I might start there since I have a couple new ones, just have been putting the replacement off until I knew that I needed them.

Thanks for the info! I will let you know how it goes.

[fy469rtse]

and if it does turn out to be the master at fault ,
dont waste your money on re manufactured ones there junk , dorman , cardone junk, just frustration,
find a good brake place, get it sleeved stainless , and buy a seal kit, it will never crud again and if it everleaks , it wont, and you can just put a new kit in again
shitty re popped or susposedly remanufactured parts have had me chasing my tail endlessly on brakes lately 

[keenkeener]

Good suggestion. My problem though is that mine looks like it was replaced at some time... I've got some new wheel cylinders that I just haven't swapped yet. I'm going to try that first. I might have an original mc on a parts car. Need to check.