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Old 04-22-2017, 07:15 PM   #2191
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Quote:
Originally Posted by Tango View Post
Hmmmm...has anyone had an Allison go into "Limp Mode"? And if the TCM goes out, will it still "Limp"?
I believe all but the 3000s will Limp because they have mechanical shift linkages, where as the 3000s.. (3060) are electronic...

from what ive read you would have R-N-{D} - stuck in 2nd gear no lockup

-Christopher
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Old 04-22-2017, 08:55 PM   #2192
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Interesting Cadillac. Mine is a 2200MH 6 speed and I went with a mechanical shifter rather than the electronic. Hopefully, I should at least be able to move even if the TCM goes South. Will have to check with the local Allison guru and see what I can find out. I'll pass along whatever I discover.
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Old 04-27-2017, 02:19 PM   #2193
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And now for something completely different...

Given the headaches associated with the limited space under my pointy Art Deco hood and around the Cummins, I am now investigating a remote Hydroboost and remote reservoir brake system. Turns out you can use a clutch master cylinder then assemble some other parts and hoses to build something like a race car setup. Saw several in online forums built by a chap out in CA that got great reviews from the owners who had similar problems so it is worth looking into. Does not require a very large master at all. Just a 3/4" piston but the output is huge after the boost.

I am researching the masters as we speak and find most are tiny enough to easily tuck in behind the engine on the firewall/dash. The Hydroboost itself can basically go anywhere within about six feet, so that presents many more options than trying to shoehorn everything right on top of the engine.

We shall see.

ONWARD?

Let's hope.
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Old 04-27-2017, 03:10 PM   #2194
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Back in the day when the boosters were vacuum the booster units were mounted in a lot of different places on the truck and bus chassis.

Most of the hydravac units were pretty large but the master cylinder was relatively small. IIRC, the MC on a Loadstar was the same part as what was used on the light line 1/2-ton and 3/4-ton trucks. Once dual circuit brake systems were mandated the Loadstar chassis buses came with two hydravac units, each of which was served by a separate circuit from the master cylinder. Those two hydravac units were HUGE and were a monster to bleed all of the air out of them if you ever had to break into the system.

I have toyed with the idea of adding a hydravac unit to my '65 Travelall since it was an option back in '65 so there are donor units out there including the mounting bracket. And the cost is very affordable.

It is a little hard to go from a 1995 Suburban with hydraboosted ABS brakes to four wheel unassisted drums on the T-all.
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Old 04-27-2017, 05:43 PM   #2195
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why not just use a regular booster like on a scout for the T-all?
-Christopher
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Old 04-27-2017, 05:47 PM   #2196
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Quote:
Originally Posted by cadillackid View Post
why not just use a regular booster like on a scout for the T-all?
-Christopher
I have a manual transmission that has a wet linkage. To swap over to a regular brake booster would require changing to a 1967/68 pedal linkage with 1967/68 only linkages to work a wet clutch linkage and a regular brake booster.

If I was going to go to all the trouble of changing pedal linkages I would swap axles to modern GM axles and get disc brakes on all four corners and swap out the manual for an automatic transmission.

It is much easier to run a line from the MC to a booster on the inner fender.
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Old 04-27-2017, 06:31 PM   #2197
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My 74 Chevy bluebird has dual hydrovac systems and power steering. I'm researching converting to Hydro boost with electric backup pump.

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Old 04-27-2017, 10:13 PM   #2198
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My 74 Chevy bluebird has dual hydrovac systems and power steering. I'm researching converting to Hydro boost with electric backup pump.

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Why would you want to do that?

It won't be cheap and I doubt you will gain very much in braking ability. The booster is still working on the brakes you already have.

Your '74 engine should have plenty of vacuum to boost your brakes. The vacuum tank should be good for at least a couple or three brake applications before you are out of vacuum.

Since you already have power steering I can't see why you would bother making the change.
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Old 04-27-2017, 10:18 PM   #2199
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My '46 came with a monster HydroVac attached to the frame. Almost hated to remove only because it was labeled...

"Bendix Aircraft Company"

But then HydroBoost is a whole different animal.
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Old 04-28-2017, 11:54 AM   #2200
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OK, here we go...or is that...STOP?...

Bit the bullet and purchased the first brake component. A Wilwood clutch master cylinder with a 3/4" bore. It comes with a couple of reservoir options including a remote mount that I will definitely be using. The Hydroboost will also be remote courtesy of a custom brake outfit called Vanco in SoCal. It will likely wind up attached to the frame...somewhere.



Ah, the joys of refurbing a 70+ year old Skoolie!

ONWARD!
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