Disc/drum drum/drum booster the same? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zonaman · 05-22-2007, 02:53 PM

I was told disc/drum booster & drum/drum booster not the same (1/2 ton) but when I changed them they looked the same. Are they? That's the drum/drum below.

Thanks.

Orange · 05-22-2007, 04:27 PM

Booster and master are the same as far as I know.
You just need a different prop valve (for your front discs).
http://www.inlinetube.com/Prop%20Valves/VCT103.htm

That's not the only place that has those.
ECE has them, GMC Paul may...(he's a board vendor too).
They just had the pic and I had the link.

DLB

Orange · 05-22-2007, 04:30 PM

BTW - what you see there is the distribution block;
http://www.inlinetube.com/Prop%20Valves/PR-112.htm

They have quite a bit of info on their site as well as parts...
http://www.inlinetube.com/Prop%20Valves/pro_valves.htm

shifty · 05-22-2007, 05:06 PM

This confused the crap out of me. The boosters for our truck aren't specific, the only major requirement is that the booster will bolt to our firewall, and that the pushrod is long enough to activate the master cylinder via the booster.

So, basically, if you wanted to, as long as your MC has roughly the same bore and stroke as the stock one, you can use it. As long as the MC will bolt to the booster, you can use it with the booster, given that the booster bolts to the firewall and will work with your pushrod (Attached to brake pedal).

Orange already covered the prop-valve issue. Drum uses a distribution. Drum/disc uses a unique prop valve to control how much pressure the discs get (prevent lockup). i am uncertain about disc/disc, but 99% sure that it also uses a prop valve so that you get more pressure to either the front or back to prevent lockup.

Longhorn Man · 05-22-2007, 05:08 PM

the masters are not the same.
the boosters are not the same.
However, there's been more than one person who has used drum/drum master and booster on a disk/drum conversion, and claim it works fine.
I wouldn't do it, but they say it's fine.

harleyx2 · 05-22-2007, 05:27 PM

what about using a drum drum booster with a 72 disc drum master cylinder on a front disc conversion.

shifty · 05-22-2007, 05:48 PM

PS - if the MC you chose was really THAT critical to the operation of your brakes, places like Summit and Jegs wouldn't carry the fifty thousand Tilton, Wildwood and SSBC "universal" master cylinders they have

shifty · 05-22-2007, 05:48 PM

Quote:

Originally Posted by harleyx2

what about using a drum drum booster with a 72 disc drum master cylinder on a front disc conversion.

get a prop valve and ditch the drum/drum distributor.

harleyx2 · 05-22-2007, 09:33 PM

shifty, i have a proportioning valve. i want to know about the booster.

shifty · 05-22-2007, 10:59 PM

Read my previous post

**PICKMUP** · 05-22-2007, 11:18 PM

The simple answer is, "Yes, they are exactly the same"

Brad · 05-23-2007, 01:53 AM

Look at the other post that's been brought back to life...

05-22-2007, 02:53 PM	#1
Zonaman Registered User Join Date: May 2004 Location: Chandler, AZ Posts: 519	Disc/drum drum/drum booster the same? I was told disc/drum booster & drum/drum booster not the same (1/2 ton) but when I changed them they looked the same. Are they? That's the drum/drum below. Thanks. Attached Images __________________ 69 C-10 LWB, 350, 700r4, 3.73 posi-traction, front disc brakes. Built for the desert- She can take the heat! Vivat Rex Chevus! Last edited by Zonaman; 05-22-2007 at 03:18 PM.

05-22-2007, 04:27 PM	#2
Orange Licensed to Thrill! Join Date: Apr 2006 Location: Northwest, GA Posts: 1,673	Re: Disc/drum drum/drum booster the same? Booster and master are the same as far as I know. You just need a different prop valve (for your front discs). http://www.inlinetube.com/Prop%20Valves/VCT103.htm That's not the only place that has those. ECE has them, GMC Paul may...(he's a board vendor too). They just had the pic and I had the link. DLB __________________ 1971 GMC.Lowered. Overdrive. Orange. Krue's excellent FAQ Index. Last edited by Orange; 05-22-2007 at 04:38 PM.

05-22-2007, 04:30 PM	#3
Orange Licensed to Thrill! Join Date: Apr 2006 Location: Northwest, GA Posts: 1,673	Re: Disc/drum drum/drum booster the same? BTW - what you see there is the distribution block; http://www.inlinetube.com/Prop%20Valves/PR-112.htm They have quite a bit of info on their site as well as parts... http://www.inlinetube.com/Prop%20Valves/pro_valves.htm __________________ 1971 GMC.Lowered. Overdrive. Orange. Krue's excellent FAQ Index.

05-22-2007, 05:06 PM	#4
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: Disc/drum drum/drum booster the same? This confused the crap out of me. The boosters for our truck aren't specific, the only major requirement is that the booster will bolt to our firewall, and that the pushrod is long enough to activate the master cylinder via the booster. So, basically, if you wanted to, as long as your MC has roughly the same bore and stroke as the stock one, you can use it. As long as the MC will bolt to the booster, you can use it with the booster, given that the booster bolts to the firewall and will work with your pushrod (Attached to brake pedal). Orange already covered the prop-valve issue. Drum uses a distribution. Drum/disc uses a unique prop valve to control how much pressure the discs get (prevent lockup). i am uncertain about disc/disc, but 99% sure that it also uses a prop valve so that you get more pressure to either the front or back to prevent lockup. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-22-2007, 05:08 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Disc/drum drum/drum booster the same? the masters are not the same. the boosters are not the same. However, there's been more than one person who has used drum/drum master and booster on a disk/drum conversion, and claim it works fine. I wouldn't do it, but they say it's fine.

05-22-2007, 05:27 PM	#6
harleyx2 Registered User Join Date: Apr 2007 Location: canton ga Posts: 49	Re: Disc/drum drum/drum booster the same? what about using a drum drum booster with a 72 disc drum master cylinder on a front disc conversion.

05-22-2007, 05:48 PM	#7
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: Disc/drum drum/drum booster the same? PS - if the MC you chose was really THAT critical to the operation of your brakes, places like Summit and Jegs wouldn't carry the fifty thousand Tilton, Wildwood and SSBC "universal" master cylinders they have __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-22-2007, 09:33 PM	#9
harleyx2 Registered User Join Date: Apr 2007 Location: canton ga Posts: 49	Re: Disc/drum drum/drum booster the same? shifty, i have a proportioning valve. i want to know about the booster.

05-22-2007, 10:59 PM	#10
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: Disc/drum drum/drum booster the same? Read my previous post __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-22-2007, 11:18 PM	#11
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,125	Re: Disc/drum drum/drum booster the same? The simple answer is, "Yes, they are exactly the same"

05-23-2007, 01:53 AM	#12
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,673	Re: Disc/drum drum/drum booster the same? Look at the other post that's been brought back to life... __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...



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