Another brake convertion ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mikie 1954 · 02-09-2010, 03:42 PM

FIRST: My truck is a 1964 GMC 3/4 ton with stock drum brakes. SECOND: I have a 1974 chevy 3/4 ton that I bought about 20 years ago to use on the ranch as a slave . i used it untill the moter gave up the gost, the transfer grumble so I parked it about 5 years ago. NOW MY ? CAN I use the power brake booster from it on my gmc with drum brakes, and if so what is involved . thanks MIKIE

**Clyde65** · 02-09-2010, 04:29 PM

I dont think so, the disc/drum master is different than a drum/drum I believe. I would probably call Master Brakes and ask them.

70 Suburban · 02-09-2010, 10:14 PM

you can split the lines use a 70 or older double m/c with it and not use the prop valve

**Bugeyev8** · 02-09-2010, 10:41 PM

why don't you swap the whole front end cross member brakes and all from the 74 to the 64, its a direct bolt on and then you can use the master clyinder and booster

mikie 1954 · 02-09-2010, 11:29 PM

THE TRUCK IS A 4X4. I forgot to say tha part, although I did say the transfer was grumbling. I have thought about makeing it into a 4x4 but that would be down the road.

**Captainfab** · 02-09-2010, 11:53 PM

If you want power brakes on your '64 I would recommend switching the master cylinder to one designed for power drum brakes. I have used the one for the '67-'70 pickups but this requires a split brake system. I'm not sure if you could use a '63-'66 power brake master on the newer booster. The dual reservior master cylinder is a better and safer one to use.

mikie 1954 · 02-15-2010, 10:28 PM

THANKS , now if I use a double m/c out of a 67 to 70 pu do I need any one from those years or a 1/2 ton , 3/4 ton or what. Also why won't the one from the 74 work? I have been reading up on this board about spliting the lines and that does seam to be the best way to go . SORRY for the dumb ? but i just want it strate in my mind. THANKS AGIAN FOR THE INFO & EVERYONES HELP ! MIKIE

70 Suburban · 02-15-2010, 11:22 PM

because the 74 has a pressure check for the disk brakes. you will need a m/c from a drum drum truck.

mikie 1954 · 02-15-2010, 11:31 PM

SO just go to the auto parts store and ask for a double m/c for a 67-70 pu drum / drum right. again thanks

70 Suburban · 02-15-2010, 11:33 PM

yep

**Chevy Fleetside** · 02-15-2010, 11:43 PM

You will need to cut the rod that goes to the brake pedal and extend it also. You can use the brake rod from the 64 becuase it is adjustable. The later model brake booster rods are too short. Ask me how I know.

The two middle holes will line up and you can drill the two lower holes. You can cut the top of the bracket off as you will probably not be using the upper holes, or you can just leave it.

mikie 1954 · 02-16-2010, 02:35 PM

I went out this morning to state takeing the booster off the 74 chevy and realized it is a 1984 pu. DOESthis change things or will it still work, sorry for the wrong info. THANKS Mikie

**Captainfab** · 02-17-2010, 01:49 AM

Nope should be the same booster.

mikie 1954 · 02-17-2010, 01:35 PM

THANK YOU 70 Suburban, Captainfab,& Chevy Fleetside. Thank you gays for the help. Also nice engine bay fleetside. Mikie

rain_man · 02-17-2010, 09:48 PM

anyone got pics of the mod on the push rod
i relly want/need a master for the 61 and i want to use a split line setup
thanks

**Chevy Fleetside** · 02-18-2010, 12:22 AM

Quote:

Originally Posted by rain_man

anyone got pics of the mod on the push rod
i relly want/need a master for the 61 and i want to use a split line setup
thanks

I can get a picture of it Thursday for you. I bolted it to the truck but I can take it off. We basically cut the rod in half and used the other side of the 65 rod and welded it up with a sleeve over it.

rain_man · 02-18-2010, 09:06 AM

thanks

mikie 1954 · 02-18-2010, 09:12 PM

I have been reading up on splitting the brake lines and cannot find where the font or back line goes to. I think that the line for the front brakes go to the outlet on m/c closest to the firewall ? In the FAQ section this is asked but not answerd. THANKS AGIAN Mikie

**Captainfab** · 02-19-2010, 02:14 AM

Which master cylinder are you using? The '67-'70 pickup master?

Quote:

Originally Posted by mikie 1954

I have been reading up on splitting the brake lines and cannot find where the font or back line goes to. I think that the line for the front brakes go to the outlet on m/c closest to the firewall ? In the FAQ section this is asked but not answerd. THANKS AGIAN Mikie

mikie 1954 · 02-19-2010, 02:31 AM

The m/c I got is for a 69 chevy 3/4 ton pu. mikie

**Captainfab** · 02-20-2010, 02:29 AM

Then I believe the front master cylinder port is the front brakes, and the rear is the rear.

mikie 1954 · 02-28-2010, 04:09 PM

Got the booster conversion done. I had the wrong fittings to adapt to the double m/c to brake lines so I tried the origanel single m/c and it works great.Will get the right fitting and put on double m/c as soon as I can [40 miles round trip to closest autoparts store]. thanks chevy fleetside for the heads up on the push rod. I had a b--ch of a time getting the bolt that goes from push rod to brake pedle back in until I called one of my daughters to help hold booster up. THANKS TO EVERYONE THAT GAVE GREAT ADDVICE MIKIE!

02-09-2010, 03:42 PM	#1
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Another brake convertion ? FIRST: My truck is a 1964 GMC 3/4 ton with stock drum brakes. SECOND: I have a 1974 chevy 3/4 ton that I bought about 20 years ago to use on the ranch as a slave . i used it untill the moter gave up the gost, the transfer grumble so I parked it about 5 years ago. NOW MY ? CAN I use the power brake booster from it on my gmc with drum brakes, and if so what is involved . thanks MIKIE

02-09-2010, 04:29 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Another brake convertion ? I dont think so, the disc/drum master is different than a drum/drum I believe. I would probably call Master Brakes and ask them. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

02-09-2010, 10:14 PM	#3
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: Another brake convertion ? you can split the lines use a 70 or older double m/c with it and not use the prop valve __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

02-09-2010, 10:41 PM	#4
Bugeyev8 Senior Member Join Date: Aug 2009 Location: San Leandro, Ca 94577 Posts: 854	Re: Another brake convertion ? why don't you swap the whole front end cross member brakes and all from the 74 to the 64, its a direct bolt on and then you can use the master clyinder and booster

02-09-2010, 11:29 PM	#5
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? THE TRUCK IS A 4X4. I forgot to say tha part, although I did say the transfer was grumbling. I have thought about makeing it into a 4x4 but that would be down the road.

02-09-2010, 11:53 PM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Another brake convertion ? If you want power brakes on your '64 I would recommend switching the master cylinder to one designed for power drum brakes. I have used the one for the '67-'70 pickups but this requires a split brake system. I'm not sure if you could use a '63-'66 power brake master on the newer booster. The dual reservior master cylinder is a better and safer one to use. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 02-09-2010 at 11:54 PM.

02-15-2010, 10:28 PM	#7
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? THANKS , now if I use a double m/c out of a 67 to 70 pu do I need any one from those years or a 1/2 ton , 3/4 ton or what. Also why won't the one from the 74 work? I have been reading up on this board about spliting the lines and that does seam to be the best way to go . SORRY for the dumb ? but i just want it strate in my mind. THANKS AGIAN FOR THE INFO & EVERYONES HELP ! MIKIE

02-15-2010, 11:22 PM	#8
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: Another brake convertion ? because the 74 has a pressure check for the disk brakes. you will need a m/c from a drum drum truck. __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

02-15-2010, 11:31 PM	#9
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? SO just go to the auto parts store and ask for a double m/c for a 67-70 pu drum / drum right. again thanks

02-15-2010, 11:33 PM	#10
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: Another brake convertion ? yep __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

02-15-2010, 11:43 PM	#11
Chevy Fleetside Registered User Join Date: Sep 2006 Location: San Francisco Posts: 4,782	Re: Another brake convertion ? You will need to cut the rod that goes to the brake pedal and extend it also. You can use the brake rod from the 64 becuase it is adjustable. The later model brake booster rods are too short. Ask me how I know. The two middle holes will line up and you can drill the two lower holes. You can cut the top of the bracket off as you will probably not be using the upper holes, or you can just leave it. Attached Images __________________ "A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536 Last edited by Chevy Fleetside; 02-15-2010 at 11:45 PM.

02-16-2010, 02:35 PM	#12
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? I went out this morning to state takeing the booster off the 74 chevy and realized it is a 1984 pu. DOESthis change things or will it still work, sorry for the wrong info. THANKS Mikie

02-17-2010, 01:49 AM	#13
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Another brake convertion ? Nope should be the same booster. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-17-2010, 01:35 PM	#14
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? THANK YOU 70 Suburban, Captainfab,& Chevy Fleetside. Thank you gays for the help. Also nice engine bay fleetside. Mikie

02-17-2010, 09:48 PM	#15
rain_man Registered User Join Date: Dec 2009 Location: daytona beach fl Posts: 187	Re: Another brake convertion ? anyone got pics of the mod on the push rod i relly want/need a master for the 61 and i want to use a split line setup thanks __________________ 61 step/long bed SBW(SOLD) NEED A NEW PROJECT



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02-18-2010, 09:06 AM	#17
rain_man Registered User Join Date: Dec 2009 Location: daytona beach fl Posts: 187	Re: Another brake convertion ? thanks __________________ 61 step/long bed SBW(SOLD) NEED A NEW PROJECT

02-18-2010, 09:12 PM	#18
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? I have been reading up on splitting the brake lines and cannot find where the font or back line goes to. I think that the line for the front brakes go to the outlet on m/c closest to the firewall ? In the FAQ section this is asked but not answerd. THANKS AGIAN Mikie

02-19-2010, 02:31 AM	#20
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? The m/c I got is for a 69 chevy 3/4 ton pu. mikie

02-20-2010, 02:29 AM	#21
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Another brake convertion ? Then I believe the front master cylinder port is the front brakes, and the rear is the rear. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-28-2010, 04:09 PM	#22
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Another brake convertion ? Got the booster conversion done. I had the wrong fittings to adapt to the double m/c to brake lines so I tried the origanel single m/c and it works great.Will get the right fitting and put on double m/c as soon as I can [40 miles round trip to closest autoparts store]. thanks chevy fleetside for the heads up on the push rod. I had a b--ch of a time getting the bolt that goes from push rod to brake pedle back in until I called one of my daughters to help hold booster up. THANKS TO EVERYONE THAT GAVE GREAT ADDVICE MIKIE!

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