Dual Master Power Brake Conversion

[tomfg]

I have a 64 C-10, with the original round single master brake cylinder,
and original "Drum / Drum" brake set-up. The truck has a 1978 350 Chevy engine.
I'd like to keep the "drum / drum" brakes, but add a dual reservoir with power booster.

I'm trying to find something in "black and white" telling me what parts would work for my setup, but I'm getting soooo lost in all the forums. Most are talking about disc / drum setups, etc.

Is there a good write-up on the net for drum / drum coversions?
Or can someone tell me what year vehicle parts would bolt in,
if I'd need any aftermarket brackets, and maybe how to best
split the brake lines.

I'd like to go to Autozone, or the likes, and buy stock parts,
and not an expensive conversion kit.

Thanks for any help!
Tom

[Indian113]

Checkout Captainfab,he makes a bracket to put a power booster on our trucks. I split my lines by using a a thread by Chief Rocka,it's a great how to thread.
The search function is your best friend on this site! Just type in the search line at the top od the forum and check the 67-72 site and read away.
Everthing I have done to my truck including wiring I have found on this site.

Good luck,you should get some more answers I hope this helps.

[Harley1650]

Definately search, theres tons of info here. Pretty easy operation. I second the suggestion for Captainfab's posts

[jocko]

you may have already seen this thread: http://67-72chevytrucks.com/vboard/s...d.php?t=487384
It describes how to do this for a drum/drum dual reservoir master cylinder setup (non-power). The rules for how to "split the lines" will apply to a drum/drum setup that is boosted or not boosted.

If you want to add a power booster to the above approach:
Follow the above, but:

- Buy Captain Fab's bracket to mount the booster just proud of the firewall.
http://67-72chevytrucks.com/vboard/s...d.php?t=347484

- Buy a "matched" set of booster and dual res master cylinder together (that way you know that the intermediate pushrod between booster and master is correct).
- Note that a "power" master cylinder will have a very shallow indentation in the firewall side of the master cylinder piston (rather than a deep indentation as in the non-power master cylinders) . I just mention this as it is a good quick way to ID a power master cyl compared to a non-power master cyl.
- My recommendation for a matched set is a 67 C10 POWER drum/drum dual res master and booster combo. 67 (year) kind of ensures it will be drum/drum (but tell the store clerk that anyway...) and POWER matched set will ensure that the booster/master mate is correct. Here is one from OReily: http://www.oreillyauto.com/site/c/de...1305&ppt=C0066 You can order the same from Autozone, Carquest, etc etc.

- Check with Capt Fab, you may need to enlarge a mounting hole or two.

- Once it's all together, you will still need to adjust the length of the brake pushrod (the one attached to the pedal) so that it is ALMOST in contact with the booster mating surface when the pedal is at full rest (against the pedal stop). You will want it to just begin to touch the booster surface at about 1/8-1/4" travel of pedal movement.
If you don't have a nut-adjustable pushrod, some are available from Speedway:
http://www.speedwaymotors.com/SSBC-U...Kit,50351.html
http://www.speedwaymotors.com/Univer...Heim,9329.html

That would be what I'd do. Hope that helps.

[krazy_texan]

i just did a dual cylinder conversion on mine but i did not upgrade to power brakes but i just got an mc for a 68 and it bolted right up with no problems

[tomfg]

Thanks everyone for your replies. It's all starting to make sense, I think.
Sounds like I need .......

A Captain Fab bracket
Matched Booster and dual master cylinder that fits a 1967
Brake line fittings
Maybe an adjustable rod from the brake pedal to master
Vacuum hose for the booster ??

Anything else?

Thanks all !

[jocko]

tom, i offered the idea of the 67 C10 dual res master only because it'll definitely be a drum/drum setup - but that's just one option, other years will work as long as it is from a "drum/drum" setup. 67 and up are all gonna be dual res masters, but the newer you get, the more likely it will be a disk/drum arrangement. One more thing to confirm when you buy is that the reservoirs on the master are the same size - if they are different, then you have a disk/drum master. I avoid the problem by asking for the 67 power drum/drum setup because there were no disk brake C10s yet! Yes, you will also need a vac hose and a full-time vac port (like one that comes from the base of a carb, etc).
Good luck.

[Captainfab]

'67-'70 were 4 wheel drum brakes with the dual reservior master.

Thanks for the recommends guys

[tomfg]

Thanks "All" again to your replies and clarifications.
PM sent to Captainfab.

[tomfg]

Captainfab, did you get my PM?

Also, anyone know if the parts stores have "universal"
power brake booster hose and fittings?
Or know what hose would work? Guessing it has
to be pretty heavy hose so it doen't collapse.
Thanks.

[Captainfab]

Yes I did Tom. Didn't you get the email I sent as you requested?

Yes the parts store should have everything you need.....at least the better parts stores should. In the past I've just used 3/8" fuel hose for the vacuum line to the booster.

Originally Posted by tomfg

Captainfab, did you get my PM?

Also, anyone know if the parts stores have "universal"
power brake booster hose and fittings?
Or know what hose would work? Guessing it has
to be pretty heavy hose so it doen't collapse.
Thanks.

[tomfg]

Captainfab, Sorry, I can not find your email. PM sent.