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Tractor hauler question

T

T.R.K.

Well-known Member
1969 GMC 1 ton. dual wheels. flat bed. (I think that would make it a '3500')

The vacuum brake booster is not boosting much at all. (Again! it was not working in 1993 when I bought it either. But back then I could get parts.) I am having difficulty finding a remanufactured booster of any kind that will fit it.

None available say they work for a 1 ton, but the aftermarket 'retrofit' kits that convert from manual brakes say they will work for 1/2 ton up through 1 ton. What gives? So I am wondering if its the same OEM booster used from 1/2 ton up through 1 ton.

Any thoughts?
 
Looking up the stock power booster RockAuto does show a difference between the different rated models. I imagine the 1 ton booster is designed to work with the rest of the heavier brake system on the heavier duty truck. However the interchangeably that surprises you, does not strike me as unusual especially for a GM product. So the fact that the same unit will bolt up to all the models is no surprise to me. The add on booster you are looking at only uses additional force created by the vacuum to push on the master cylinder plunger harder to increase the braking action. So it is basically increasing your foot pressure as seen by the master cylinder. So it is made to increase the braking ability as stated above whether it is being added to the half ton or the one ton, in each case it make the brakes work better. The link should get you to the stock brake booster for your truck. It is just for reference I am not sure if you can bolt in a stock booster and get power brakes. I am fairly sure the booster connects to the pedal differently then the manual master cylinder would.
Online Auto parts
 
Another one of those they all interchange. Not. It is generous motors, now government motors. What do you expect with them. I was told all about being able to swap out a 305 for 350 one time. Boss gave me the job. Nothing except the mounts fit or swapped. Everything on that engine had to be switched for it to work what a piece of junk. Chrysler on the other hand would have been an easy swap in those days.
 
Go to a salvage yard and get a Hydroboost and power steering pump from a later square body gm one ton. Much better assist for a big truck than any vacuum booster.
 
Did you check the vacuum hose to the booster for free flow?

Common for the hose to collapse internally and deliver little to no vacuum to the booster.

As for retrofitting a booster, as long as it is a large diameter, the cylinder bolts up and the plunger is the right length, and it can be mounted, it should work.

Done it before and had no problem with the function.
 
There are many variables to consider;
-push rod length
-mounting configuration
-stroke....

Your best bet would be remove yours and have it rebuilt.

Still quite a few shops out there that specialize in boosters.
 
Similar issue a couple of years ago with my chevy C50. Bought the most similar booster I could find and modified brackets and hose fittings. Possible advantage I had was that it was a large frame mount booster separate from the master cylinder.
 
I just went through this dilemma with a 1975 F 600. There were not any remanufactured ones to be had from any parts houses like used to be. What I wound up doing was pulling it and dropped it off at the local big truck parts place. They shipped it off to have it rebuilt. There was a month waiting period tho to get it back to reinstall.
 
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