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1972 270 hydroboost conversion

Unread postby dirtydeno on Mon Mar 12, 2018 8:45 am

I instlled a hydroboost on the 270 yesterday. I used a hydro boost off of an 06 E450. I mounted the booster as low as i could on the original bracket so the resorvoir would clear the floor.
A02313F3-3B9ACA00-2-20180309_171039.jpg

I had to add add some metal to the brake arm to move the plunger hole to a spot where it would get a full stroke and the lever throw was not to long. It took a few holes to get it right.
A02313F3-3B9ACA00-4-20180309_171108.jpg

The entire bracket then just bolts back up. I drilled a hole in the floor for adding brake fluid and cut the carpet in a flap so it is hidden. I then removed all of the hydro vac system. I just need to have 2 power steering lines built and connect my lines. I also need to install a proportioning valve.
A02313F3-3B9ACA00-1-20180311_111240.jpg
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Re: 1972 270 hydroboost conversion

Unread postby 77Travco on Tue Mar 13, 2018 9:19 am

I know there are some members on this forum that would definitely be interested in this. Please be sure to post up your road test results!
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Re: 1972 270 hydroboost conversion

Unread postby dirtydeno on Wed Mar 28, 2018 8:33 am

I got all the new hydro boost lines made along with all new braided hoses and all new 1/4" tube. I used about 35 feet of brake tube. I used a chevy proportioning valve for disc/drum with a built in residual pressure valve. It turned out pretty nice. I still need to connect the wire from the old block to the new one. I have not yet driven it do to a gas tank issue but this weekend it should be on the road.
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Re: 1972 270 hydroboost conversion

Unread postby dirtydeno on Sat Mar 31, 2018 8:14 pm

I just drove the travco for the first time. It brakes great. It stops very quickly and feels similar to e450s i drive at work. I can brake and turn at the same time and the stock pump does well. I did not drive it with the hydrovac brakes so i cannot really compare it to the before but i am very happy with it. Also it hasnt been driven since the 90s and it did great. Very well built rig.
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Re: 1972 270 hydroboost conversion

Unread postby rjsdotorg on Sat Mar 31, 2018 11:02 pm

So was this same as my '71, and the master now faces rearward instead?
That's what I wondered most about converting the pedal-lever.
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Re: 1972 270 hydroboost conversion

Unread postby dirtydeno on Sat Mar 31, 2018 11:26 pm

rjsdotorg wrote:So was this same as my '71, and the master now faces rearward instead?
That's what I wondered most about converting the pedal-lever.

The master faces rearward opposite of a regular vehicle but the original also faced rearward. The pedal is still the same.
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Re: 1972 270 hydroboost conversion

Unread postby rjsdotorg on Sun Apr 01, 2018 10:34 am

Ahh, that must have been the switch-over year to rearward. Mine is "early" 71.
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Re: 1972 270 hydroboost conversion

Unread postby datsit on Wed Apr 04, 2018 7:25 pm

Your 72 should have drums on the front ?
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Re: 1972 270 hydroboost conversion

Unread postby rjsdotorg on Wed Apr 04, 2018 8:06 pm

datsit wrote:Your 72 should have drums on the front ?

My 71 does, and I think 72-73 "should" as well, if OEM.
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Re: 1972 270 hydroboost conversion

Unread postby dirtydeno on Thu Apr 05, 2018 4:54 pm

my 72 had drums but i swapped the front axle to disc.
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