Rear disc master cyl/booster setup dana 60

[Hasselholf]

Can a stock 1ton/ 3/4 ton master cylinder & booster from a 1979 dodge handle a 4-disc setup? (Will it lock up 35's)
It originally came with front disc, rear drum setup & I was considering a disc setup for my dana60. I was reading the jeep thread and found they need to upgrade both the master cyl. & go to a double diaphram booster to make it work correctly. Just wondering if I will need to do the same.

[MMiller]

I put rear discs on my 75 dodge w200. Dana 60 front factory discs, and then used chevy 3/4 ton front calipers/rotors on the 14 bolt rear. The brakes work great with the stock 3/4 master cylinder/bigblock booster. The only bad thing right now is my pedal has a lot of travel. I think the rear calipers are coming all the way open when off the brakes. I have been told to put check valves in the lines to the rear calipers. Another person told me to pull the guts out of the factory porportion valve. Its inside the frame rail below the booster.

I say big block booster cause a slant six/small block booster is larger diameter, and they will hit the valve covers of a big block. So mine is smaller diameter.

I have not done any of the suggestions up top to solve my long travel problem yet. But the master cylinder seems to be up to the task.

EDIT** My brother runs this same setup on his 79 with 44" boggers and stopping is a non issue.

Michael

[Hasselholf]

Thanks,
Now I just need to decide if it is worth it for me to swap out or not.
Does anyone know if the power booster/mc is the same on 1/2 tons as 3/4, or 1 tons. Is their a difference or did dodge use the same throughout. I ask because I did the swap a few years ago on a 90 dodge 1/2 ton & was not very happy with the stopping power.

[PJTPW]

I have a "factory" reman one ton PBB and MC from a 1978 Dodge on mine and I can lock up 44's with very fast stops from speed. I'm running a D 60 front and 14B rear with Discs. I ditched the proportioning valve and put in a Wilwood unit, but I haven't turned it down at all.

I'm not sure that the 1 ton and 3/4 ton are the same. I think the 3/4 ton units are the same size as the one ton if the truck came with a 60 front. I ordered PBB and MC for the heaviest rated front axle.

Ryan

[Hasselholf]

Cool, ordered the brackets yesterday. Thanks for the input.

[VancoPBS]

for 79 Dodge trucks.

1/2 ton took a single diaphram brake Booster.
3/4 took 2 boosters both duel diaphram. 3.5 axles took a 9 inch duel diaphram booster. 4.5 axle took an 10 inch duel diaphram booster.
1 ton This is where it gets weird. It also took 2 boosters but both are 9 inch duel diaphram boosters. So the 1 tons actually put out less power then the 3/4 ton 4.5 axle. (exception is the W350, it took the same 10" as the 4.5 3/4 ton).

I assume there was a space issue?

[Hasselholf]

No space issue, just was reading the cj thread where everone was having having problems with their disc brake conversions and wanted to make sure the booster setup I had was enough to get the job done. It appears mine is a single diaphram, but I am not sure. All the parts (axle, ect are a 3/4 ton setup). I have yet to get the ruler out. I hope it is enough because I just ordered the disc brake brackets. Would I have noticed if it was a dual diaphram?

[MMiller]

for 79 Dodge trucks.

I assume there was a space issue?

I assume 79's had the 440 option. If you use a large diameter booster it will hit the valve cover on the 440. Even with the smaller one, v/c removal is not fun. I think this may answer your question on size/space issues.

Michael