WTB Brake booster

[Longhorn Man]

Not looking forward to doing this job again.
I need a power brake booster, the smaller ones off a 3/4 ton or one ton truck... 4 wheel drum. Don't need any brackets or the booster, and prefer one that is not filled with brake fluid.
Who can give me a real good deal?
And how much shipped to 43228?
Spend almost 500 bucks on my brakes and I can still hardly stop. I just installed this booster 2 years ago, and i KNOW it was good, this was the one in my blue longhorn.

EDIT
I wrote that I didn't need the booster, that should have said master cylinder.
NFC what I was thinking when i typed that.

[Longhorn Man]

Bump

[chevytruckfan]

Do you mean the Master cylinder? You said that you don't need the booser or brackets?

[longhorn71]

Andy, I have one here.It was on a 67 1-ton and did work when the truck was parked.$20 plus the ride for it.PM me if you are intested
-thanks Dean

[Longhorn Man]

LOL...you're right...which explains the PMs I got earlier for a master cylinder.
I need the booster. I had ment I didn't need the brackets or the master cylinder.
Dean, any idea what that would cost to ship here? That's quite a ride.

[tnblazerk5]

hey i am getting a 72 super tommarow i will see whats on it for ya

[longhorn71]

Andy,not sure on shipping but Crystal well phone for prices in the afternoon.In themoring she has to go to school with the kids.

[Longhorn Man]

Sweet...lets see what happens.
Just to verify...this is nthe style we're talkin about...off a 4 wheel drum truck.

[Longhorn Man]

tnblazerk5, one off a 72 won't work. Needs to be a drum/drum truck.

[longhorn71]

sure is andy,this one is the smaller one too.The truck had 4 wheel drum brakes on it .

[meathead95]

if you know the pads are good and your sure the booster/mastercylinder is good maybe your lines are bad

[Chevy Muscle]

I don't want to derail this, but I was wondering what the difference between a drum/drum and a disk/drum booster is.??? I know the master cylinders would be different in those applications, but why would the booster be diffferent?

..... the reason I'm wondering is that I have a 69 blazer that I just put disks on the front (with a disk/drum M/C and prop valve) but the booster does't seem to be working now.

[avejoe]

I just finished brake hell. Replaced just about the entire system and finally upgraded the stock booster to a dual diaphram booster. The stock booster tested good (held vaucum, etc.) but would not panic stop the truck. With the bigger booster the brakes work great.

The booster guy said the brake system on our trucks (1/2 tons anyway) are on the small side and now with the non-asbestos pads, a bigger booster is needed.

[tnblazerk5]

Originally Posted by Longhorn Man

tnblazerk5, one off a 72 won't work. Needs to be a drum/drum truck.

i got to learn to read sumtime

[Longhorn Man]

Originally Posted by meathead95

if you know the pads are good and your sure the booster/mastercylinder is good maybe your lines are bad

Well, the master cylinder was brand new as of 2 years ago.
The booster did work when i installed it.
The shoes in the back are brand new with 5 or so miles on them.
Front shoes are as good as new, I suspect they had just been replaced before the original owner wrecked the truck. They are acually thicker than the new ones NAPA sold me...so i returned them.
All 4 wheels have new spring/hardware kits, and 3 of them have new adjusters, and 3 of them have new wheel cylinders.
The hose from the rear of the frame to the axle is a brand new item also.
I did consider other problems, like the lines. However, it gravity bled with no problems at all. Since the brakes aply fine, just take way too much effort to apply, I went directly to the booster and disconnected it and the pedal was exactly the same.

Originally Posted by Chevy Muscle

...what the difference between a drum/drum and a disk/drum booster is...

I wish i could remember...but it has been 2 1/2 years since I messed with the boosters.
When i got the Longhorn, it had a frozen booster. When you hit the brake pedal, the pedal would stay in the down position. I replaced it with the one I have in there now, and all was good.
There were a couple 71/72 boosters in the back, and I tried doing it, but it just didn't go. I know ppl have put the disc master cylinder on the drum booster...but I was unable to make it work the other way around.

[Longhorn Man]

Anyone else have one laying around? The shipping on 71Longhorns is a little high...may end up having to do it anyways.

[teeitup]

Andy, I got one here but I know nothing about it, I got some bigger ones too. I can get pics Wed afternoon. Thanks Randy

[Longhorn Man]

Like I said, I can't remember why...I just remember, the drum/drum master cylinder doesn't go onto the drum/disc booster.
Plus, different set ups need different amounds of assistance.
A drum brake only needs a few PSI to work, and minimal vacume to assist since minimal PSI is needed to apply the brakes.
A disc brake needs a much higher line pressure, and in turn, it needs more assist to be of any use.
So, in essence, if you put a drum/drum booster on a disc equipped vehicle. you are not getting the full effect of the power brakes. If you were to (be able to) place a disc booster in a drum vehicle, you'd end up with too much assist, and very sensitive brakes.

[Longhorn Man]

Tee...sweet, let me know what you get. Either here, or at cockroach93@ yahoo.com
Thanks man.

[Chevy Muscle]

Longhorn Man, I'm looking into boosters myself and, I'm no expert, but I just ran across this statement on at tech article from Classic Performance Parts relating to 67-72 trucks: "These years, the power boosters were all the same for disc or drum equipped trucks."

I don't want to argue over it, I was just hoping that if you didn't limit your search to only trucks that had drum brakes, then you might have more of a selection. Good luck on your search.

[teeitup]

Andy, here is the one I have, I know nothing about it though. $20 plus shipping. Thanks Randy

[Longhorn Man]

Originally Posted by Chevy Muscle

...article from Classic Performance Parts relating to 67-72 trucks: "These years, the power boosters were all the same for disc or drum equipped trucks."...

Like I said, I've already tried this. I had 2 drum/disc boosters in the back of the truck when i got it, and it wouldn't work. Some of the things that these companies/people write can be way off base.

Originally Posted by 67ChevyC10Stepside

andy.....the pressures are done through the prop valve.....the booster has nothing to do with it....the drums require more pressure....they have 100 Pound springs on them that you have to over come before they move....the discs move instantly.

Actually, the pressure is determined by the master cylinder and it's bore size and stroke. The vacume assists the pedal being depressed, which in turn makes it easier to create more pressure in the lines.
As for the PSI required to apply drums verses discs...the discs take WAY more psi to operate. I used to have numbers...but I lost it somewhere at *her* place, and I don't want to spend the time listening to her complain ( )to go and look for it.

Randy, if you'd be willing to remove the master cylinder..then I'll roll the dice on the booster. (asuming no rubber falls out when you pull the master off of there)
Would you be able to get me a quote to 43228?

[teeitup]

Andy, I'll take it to work with me tomorrow and see if I can get it off without tearing anything up. I'll let you know tomorrow night, Thanks, Randy

[Longhorn Man]

Awsome.

[cableguy0]

the proportioning valve actually sends less fluid to the rear under hard braking to stop the rear wheels from locking up when the @ss end of the vehicle lifts due to weight transfer caused by trying to stop.on our trucks the rear brakes are the only thing affected by the proportioning valve other than that all it does it turn on the brake warning light if there is a loss in pressure. the booster just helps to push the master cylinder nothing more but if you use a booster that is designed to push in a disk brake system you will constantly lock up a 4 wheel drum system.the master cylinder is what designates the amount of pressure going to which place. disks require about 2000 psi line pressure to properly work where drums only require a couple hundred pounds. clamping the rotor take a lot more pressure than pushing the shoes out. the springs in a drum brake setup arent much to overcome.go read some books on how brakes work whether disk or drum then reply.