Power brake question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*ksjh1316* · 06-24-2008, 07:24 PM

I am looking to add power brakes to my 71 and just wanted to know which brake booster to ude the 7", 9" or 11". Just really don't understand the differences.

myoldchevytruck · 06-24-2008, 09:11 PM

Doesn't your 71' have front disk brakes? If so, you don't have power brakes? That's odd.

heavy71chevy · 06-24-2008, 09:24 PM

my 71 has disk fronts but non power aswell...but it did come with PS

myoldchevytruck · 06-24-2008, 09:53 PM

Quote:

Originally Posted by heavy71chevy

my 71 has disk fronts but non power aswell...but it did come with PS

heavy71chevy - Interesting. I did not know that P/B were an option on the 71', thought it was standard due to the disk brakes.

Jeff - Don't know much about the brake booster but hear allot of people talking about a 7" dual diaphram brake booster. I'll too will be looking into this myself. Maybe someone will chime in on this.

*ksjh1316* · 06-24-2008, 11:22 PM

Thanks for the help so far mine has discs but no power brakes. It is weird that it is a 292 with ps heavy duty suspension and 4:10 posi

petey-pablo · 06-25-2008, 05:24 AM

Me to would like to know I want to add power to my 72 front disc rear drum!

Sport/Truck · 06-25-2008, 08:21 AM

I tried to start a thread on this too, as the thread in FAQ is very vague. In my research the duel diaphragm offers greater stopping power over a single.
The 3/4 ton trucks used duels, but I’m only able to find a 10 3/4 dia.
I would like to know where to get the smallest possible unit.
Like you, I have non power brakes with front disc brakes. What I’m finding is the rod is mounted lower on the brake peddle for power brakes. I would like to hear from people who have done this with & without lowering the rod.
s/t

Sinisterspeed · 06-25-2008, 11:50 AM

Booster & Master Cylinder Specifcations
Use this data to design your own system or to upgrade an existing power brake system.

7" STREET ROD POWER BOOSTER (PB7001)

The 7" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 950 psi with a 1" bore master cylinder. This pressure level will work great for four wheel drum systems and disc/drum vehicles which are relatively light. This booster is not recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system. This is the booster supplied with our under floor pedal kits.

7" DUAL DIAPHRAGM POWER BOOSTER (PB7537)

The 7" dual diaphragm street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of about 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier.

8" STREET ROD BOOSTER (PB8531)

The 8" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier. This booster is recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system.
9" SLIMLINE (PB9002)

The 9" slimline booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1100 psi with a 1" bore master cylinder. This pressure level will work great for disc/drum vehicles. This booster is recommended for heavy disc brake cars like 55 Chevy's or for street rods.
9" DUAL DIAPHRAGM BOOSTERS

The 9" dual diaphragm ultra booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1400 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems on heavier cars and trucks.
MC2912H
This 1-1/8" bore master cylinder works with any of the boosters above and is recommended for disc/disc systems. The master Cylinder comes with a piston adapter. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below). Outlets: A=9/16 B=1/2

MC1321H
This 1" bore master cylinder works with any of the boosters above and is recommended for disc/drum or disc/disc systems. Outlets on both sides. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below).
Outlets: A=9/16 B=1/2.

--------------------------------------------------------------------------------

There are basically two different master cylinders that we use for our Chevy and Ford kits, the deep bore master cylinder and the shallow bore master ylinder. To determine which master cylinder your booster is setup to mate with, you can do the following simple check. For shallow bore master cylinders, the pushrod should be approximately flush with or below the booster face. Deep bore master cylinders will protrude past the face of the booster body by about 1” to 1-1/2”. Note that deep bore master cylinders are required for manual brakes and shallow bore master cylinders are generally used for power brake systems. We now supply a master cylinder piston adapter (pictured) to accommodate both master cylinders. You will only use this adapter when you have a deep bore master cylinder with a short booster pushrod.

Sinisterspeed · 06-25-2008, 11:52 AM

copied this from the FAQ/Tech area of MBM where I got mine from. Hope it helps

petey-pablo · 06-26-2008, 06:11 AM

Quote:

Originally Posted by Sinisterspeed

copied this from the FAQ/Tech area of MBM where I got mine from. Hope it helps

MBM? What is that do you have a link to the website? Thanks

Sport/Truck · 06-26-2008, 06:52 AM

Quote:

Originally Posted by petey-pablo

MBM? What is that do you have a link to the website? Thanks

Probably this one. http://www.mbmbrakeboosters.com/Parts.html
s/t

petey-pablo · 06-27-2008, 12:40 AM

Quote:

Originally Posted by Sport/Truck

Probably this one. http://www.mbmbrakeboosters.com/Parts.html
s/t

Thanks Sport/Truck!

1BAD65 · 08-29-2018, 04:56 PM

[QUOTE=Sinisterspeed;2780462]Booster & Master Cylinder Specifcations
Use this data to design your own system or to upgrade an existing power brake system.

7" STREET ROD POWER BOOSTER (PB7001)

The 7" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 950 psi with a 1" bore master cylinder. This pressure level will work great for four wheel drum systems and disc/drum vehicles which are relatively light. This booster is not recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system. This is the booster supplied with our under floor pedal kits.

7" DUAL DIAPHRAGM POWER BOOSTER (PB7537)

The 7" dual diaphragm street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of about 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier.

8" STREET ROD BOOSTER (PB8531)

The 8" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier. This booster is recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system.
9" SLIMLINE (PB9002)

The 9" slimline booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1100 psi with a 1" bore master cylinder. This pressure level will work great for disc/drum vehicles. This booster is recommended for heavy disc brake cars like 55 Chevy's or for street rods.
9" DUAL DIAPHRAGM BOOSTERS

The 9" dual diaphragm ultra booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1400 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems on heavier cars and trucks.
MC2912H
This 1-1/8" bore master cylinder works with any of the boosters above and is recommended for disc/disc systems. The master Cylinder comes with a piston adapter. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below). Outlets: A=9/16 B=1/2

MC1321H
This 1" bore master cylinder works with any of the boosters above and is recommended for disc/drum or disc/disc systems. Outlets on both sides. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below).
Outlets: A=9/16 B=1/2.

--------------------------------------------------------------------------------

THIS IS WHY I LOVE THIS FORUM !!
TONS OF INFORMATION AVAILABLE AT YOUR FINGERTIPS

GETTING THE BCK1006-8531 MODEL - BOOSTER, MC , AND EXTENSION ROD $99!

THANKS!

06-24-2008, 07:24 PM	#1
ksjh1316 Account Suspended Join Date: Jul 2007 Location: Wichita KS Posts: 1,599	Power brake question I am looking to add power brakes to my 71 and just wanted to know which brake booster to ude the 7", 9" or 11". Just really don't understand the differences.

06-24-2008, 09:11 PM	#2
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	Re: Power brake question Doesn't your 71' have front disk brakes? If so, you don't have power brakes? That's odd. __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors

06-24-2008, 09:24 PM	#3
heavy71chevy Registered User Join Date: Apr 2007 Location: antreville, south carolina Posts: 873	Re: Power brake question my 71 has disk fronts but non power aswell...but it did come with PS __________________ "Dixie Destroyer" 71 C10 LWB Fleet Future Blown Prostreet Monster

06-24-2008, 11:22 PM	#5
ksjh1316 Account Suspended Join Date: Jul 2007 Location: Wichita KS Posts: 1,599	Re: Power brake question Thanks for the help so far mine has discs but no power brakes. It is weird that it is a 292 with ps heavy duty suspension and 4:10 posi

06-25-2008, 05:24 AM	#6
petey-pablo "THE GREEN GOBLIN" Join Date: Mar 2008 Location: Fremont Ca. Posts: 1,025	Re: Power brake question Me to would like to know I want to add power to my 72 front disc rear drum!

06-25-2008, 08:21 AM	#7
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Power brake question I tried to start a thread on this too, as the thread in FAQ is very vague. In my research the duel diaphragm offers greater stopping power over a single. The 3/4 ton trucks used duels, but I’m only able to find a 10 3/4 dia. I would like to know where to get the smallest possible unit. Like you, I have non power brakes with front disc brakes. What I’m finding is the rod is mounted lower on the brake peddle for power brakes. I would like to hear from people who have done this with & without lowering the rod. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

06-25-2008, 11:50 AM	#8
Sinisterspeed Registered User Join Date: Apr 2008 Location: Gales Creek, Oregon Posts: 619	Re: Power brake question Booster & Master Cylinder Specifcations Use this data to design your own system or to upgrade an existing power brake system. 7" STREET ROD POWER BOOSTER (PB7001) The 7" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 950 psi with a 1" bore master cylinder. This pressure level will work great for four wheel drum systems and disc/drum vehicles which are relatively light. This booster is not recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system. This is the booster supplied with our under floor pedal kits. 7" DUAL DIAPHRAGM POWER BOOSTER (PB7537) The 7" dual diaphragm street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of about 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier. 8" STREET ROD BOOSTER (PB8531) The 8" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier. This booster is recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system. 9" SLIMLINE (PB9002) The 9" slimline booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1100 psi with a 1" bore master cylinder. This pressure level will work great for disc/drum vehicles. This booster is recommended for heavy disc brake cars like 55 Chevy's or for street rods. 9" DUAL DIAPHRAGM BOOSTERS The 9" dual diaphragm ultra booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1400 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems on heavier cars and trucks. MC2912H This 1-1/8" bore master cylinder works with any of the boosters above and is recommended for disc/disc systems. The master Cylinder comes with a piston adapter. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below). Outlets: A=9/16 B=1/2 MC1321H This 1" bore master cylinder works with any of the boosters above and is recommended for disc/drum or disc/disc systems. Outlets on both sides. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below). Outlets: A=9/16 B=1/2. -------------------------------------------------------------------------------- There are basically two different master cylinders that we use for our Chevy and Ford kits, the deep bore master cylinder and the shallow bore master ylinder. To determine which master cylinder your booster is setup to mate with, you can do the following simple check. For shallow bore master cylinders, the pushrod should be approximately flush with or below the booster face. Deep bore master cylinders will protrude past the face of the booster body by about 1” to 1-1/2”. Note that deep bore master cylinders are required for manual brakes and shallow bore master cylinders are generally used for power brake systems. We now supply a master cylinder piston adapter (pictured) to accommodate both master cylinders. You will only use this adapter when you have a deep bore master cylinder with a short booster pushrod. __________________ There are two kinds of people, those who finish what they start and so on. 70 GMC Longhorn (A.K.A Money Bucket) 57 Chev 3100 05 Chevy LLY Dmax. 67 Chevy Camaro Dad's Budget Build 55 My Longhorn Build

06-25-2008, 11:52 AM	#9
Sinisterspeed Registered User Join Date: Apr 2008 Location: Gales Creek, Oregon Posts: 619	Re: Power brake question copied this from the FAQ/Tech area of MBM where I got mine from. Hope it helps __________________ There are two kinds of people, those who finish what they start and so on. 70 GMC Longhorn (A.K.A Money Bucket) 57 Chev 3100 05 Chevy LLY Dmax. 67 Chevy Camaro Dad's Budget Build 55 My Longhorn Build

08-29-2018, 04:56 PM	#13
1BAD65 Registered User Join Date: Jan 2012 Location: Madera,CA Posts: 111	Re: Power brake question [QUOTE=Sinisterspeed;2780462]Booster & Master Cylinder Specifcations Use this data to design your own system or to upgrade an existing power brake system. 7" STREET ROD POWER BOOSTER (PB7001) The 7" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 950 psi with a 1" bore master cylinder. This pressure level will work great for four wheel drum systems and disc/drum vehicles which are relatively light. This booster is not recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system. This is the booster supplied with our under floor pedal kits. 7" DUAL DIAPHRAGM POWER BOOSTER (PB7537) The 7" dual diaphragm street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of about 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier. 8" STREET ROD BOOSTER (PB8531) The 8" street rod booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1200 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems and disc/drum vehicles which are heavier. This booster is recommended for heavy disc brake cars like 55 Chevy's or for any four wheel disc brake system. 9" SLIMLINE (PB9002) The 9" slimline booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1100 psi with a 1" bore master cylinder. This pressure level will work great for disc/drum vehicles. This booster is recommended for heavy disc brake cars like 55 Chevy's or for street rods. 9" DUAL DIAPHRAGM BOOSTERS The 9" dual diaphragm ultra booster requires 18" of vacuum to operate properly. With this vacuum level the booster will produce a maximum pressure output of 1400 psi with a 1" bore master cylinder. This pressure level will work great for four wheel disc systems on heavier cars and trucks. MC2912H This 1-1/8" bore master cylinder works with any of the boosters above and is recommended for disc/disc systems. The master Cylinder comes with a piston adapter. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below). Outlets: A=9/16 B=1/2 MC1321H This 1" bore master cylinder works with any of the boosters above and is recommended for disc/drum or disc/disc systems. Outlets on both sides. Master Cylinders work for manual or power applications (see Check Booster Pushrod Adjustment Below). Outlets: A=9/16 B=1/2. -------------------------------------------------------------------------------- THIS IS WHY I LOVE THIS FORUM !! TONS OF INFORMATION AVAILABLE AT YOUR FINGERTIPS GETTING THE BCK1006-8531 MODEL - BOOSTER, MC , AND EXTENSION ROD $99! THANKS!



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.