master cylinder on my 1964 chevy panel

[ironman3452]

ok I, want to replace my single master cylinder, with a duel one, any thoughts as to what type and what year will work, it still has the drum brakes, so any help would be appreciated.


thanks

[jayoldschool]

1967 C10 master. Drum/drum. Front port goes to FRONT wheels (unlike later 70s-80s-90s masters). No proportioning valve.

[ironman3452]

Ok so I have that, new master, bench bled, installed, ran new lines, power bled lines, now peddle goes to floor, like no brakes, what am I doing wrong, I am ready to give up and just put the single back on

[DPowers]

What year MC is it?

[Keith Seymore]

There's always a chance that the new master cylinder is defective, right out of the box.

K

[ironman3452]

MC is from a 69 chevy truck, with drum brakes, new from the box, when I bench bled it , it felt good, installed, hooked all lines up, added fluid, power bled ,still no brakes

[ironman3452]

I understand that, auto store only had one, and if that is true, I was told that it would be 2 -3 weeks before they would have a new one, so what of anything can I do to try to see if the new MC is defective?

[DPowers]

Can you tell if the rod from the pedal is making proper contact to the MC?

[ironman3452]

at first I used the brake rod that as in my panel, then I found that the rod was not moving the piston, I extended it to make full contact, so I thought that might be the problem, still no pressure on peddle, so, I hear the wheel cylinders making noise, so next, I am going to see if the brakes need adjusting, will let every one know what I find

[jayoldschool]

Undo the hard line that goes into the rubber above the axle. Mine blocked when bleeding. Doesn't replicate your symptoms, however, mine gave high hard pedal after blocking.

[ironman3452]

Ok here is what I found, checked all fittings, then I went to rear, I tried to adjust the driver side wheel, I could not get it to tighten, so I blocked the line to that wheel, went and checked to see and I had full pedal, so now I will take the rear driver side to see if the wheel cylinder is no working, have to wait until after the first to tear into it, will let you know what I find,.
Thanks for your help

[ironman3452]

Well found out why no brakes to rear, today I removed axle and then the hub assembly , to find wheel cylinder had leaked, and also no brake lineings on the brake, also the hubs were scored, will see if I can find some place to turn them, will let you know how that goes.