720 break booster in a 521

Post Reply
User avatar
kylezone
Posts: 113
Joined: Sat Jun 29, 2013 12:51 am

720 break booster in a 521

#1

Post by kylezone » Tue Aug 26, 2014 11:45 pm

ok, so the problem is, I need a break booster, but the 521 clutch/ break masters are super close together, so no room for a booster. With 720s Nissan was super cool and decided to put the booster on a pedistle that pushed it out past the clutch master, so thats what im using.

The pedistle is pretty big, and has a plate that extends out over the spedo-cable hole and gets in the way of where im eventually going to have to put my 720 stearing column bracket.

Image

the booster side of the pedistle has 4 nuts that hold it on, so i removed those to flip it 180 degrees.

Image

Image

now the longer side of the plate is covering the clutch master hole, so I took a piece of heavy paper and makde a quick template.

Image

Image

Image

Image

I aligned the pedistle so it was positioned where i wanted it over the break master hole, and trying to keep things parallel so that the new master isnt tilted when installed.

Image


and than made a mark where the clutch master will be.
Image

I only wanted to cut a hole big enough for the flange on the firewall side of the clutch master to fit into, so that the clutch master is sitting on top of the pedistle plate, partly to hide my really bad cutting skills. (all i had to work with was an angle grinder lol.) and partly to help hold the pedistle against the firewall.

Image

Image

Its not quite finished yet, i still have to do a bit of trimming to get it to fit, and ill need to hammer-in a small section of the driver side wheel well to clear the booster. but you get the idea.

and a huge thank you to Wayno for all the help!

User avatar
DRIVEN
Posts: 5717
Joined: Thu Jun 27, 2013 7:05 pm
Location: I've been everywhere
Has thanked: 41 times
Been thanked: 14 times

Re: 720 break booster in a 521

#2

Post by DRIVEN » Wed Aug 27, 2014 4:35 am

Good writeup. :thumbs:
When the only tool you have is a hammer every problem starts to look like a hippy.

User avatar
jayden71
Posts: 7799
Joined: Thu Jun 27, 2013 10:44 am
Title: Bewb Captain
Cars: '71 Viagra blue 521
'79 Patina KC 620
Location: Land of Po ta toes

Re: 720 break booster in a 521

#3

Post by jayden71 » Wed Aug 27, 2014 6:18 am

Nice write up man!

There are lots of 720s in my area junkyards

I may cinsider doing this.

:thumbs:
DRIVEN » Tue Nov 04, 2014 6:30 pm wrote:I think Bill might be gettin laid.
Ni10 » Wed Nov 19, 2014 7:56 am wrote: all Datsuns ran when parked.

Charlie69
Posts: 58
Joined: Thu Dec 05, 2013 8:23 pm
Cars: 1966 520
1985 720 King Cab ST
1986 720 King Cab Daily driver

Re: 720 break booster in a 521

#4

Post by Charlie69 » Sat Dec 06, 2014 9:25 pm

Looks like it belongs. What other clearance issues did you have?

User avatar
wayno
Posts: 3434
Joined: Thu Jun 27, 2013 8:44 pm
Location: Vancouver WA
Been thanked: 9 times

Re: 720 break booster in a 521

#5

Post by wayno » Sat Dec 06, 2014 9:57 pm

Charlie69 » Sat Dec 06, 2014 10:25 pm wrote:Looks like it belongs. What other clearance issues did you have?

This is what I did in my 521KC diesel, the thing that worked out for me was that the diesel intake manifold doesn't stick out that far, so the Ford Courier booster doesn't hit anything.
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
You can see I had to change the mount hole location for the master brake cylinder, and I had to hit the inner fender a little to clearance the Ford Courier booster, but it worked out great with the diesel engine in the truck, the stock downdraft carb manifold might also clear, I guess it would depend on what booster was used, not sure about dual SUs though.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein

Post Reply