disks installed which booster and m/c? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CMC67 · 09-02-2009, 08:59 PM

I installed disks up front on my 67 from a 72. The booster and m/c on there was already on the truck but both are shot. So do I get a 67 replacement booster and m/c or use set up from disk brake equipped truck? Please help.

CMC67 · 09-02-2009, 10:25 PM

should I use 67 master cyl. or 71-72

unclewatts · 09-03-2009, 12:16 AM

The 67 MC is a drum MC. The 72 MC is a disk MC with a larger capacity reservoir. I would very strongly recommend using 72 MC. The booster I'm pretty sure is the same for both disk or drum brakes. Find out what kind of booster the truck you got the disks from had. Be aware the GM offered both Delco and Bendix boosters for 71-72 half ton trucks. If it's a big pancake looking thing that's black, it's a Delco. If it's more cannister shaped and gold, it's a Bendix. Also, buy a new/rebuilt MC and booster. that way you know you have a safe braking system. BTW, I think you have to change out the old drum prop valve for a newer disk prop valve or an adjustable one. Sorry I'm spending all your money but you wanna do it right when it comes to brakes.

dwcsr · 09-03-2009, 01:26 AM

You may also need a new prop valve for Disc/Drum

SIXT8LOU · 09-03-2009, 01:27 AM

what else to you switch out to make the swap work?? thanks

**special-K** · 09-03-2009, 07:28 AM

For disC brake swaps you want to get the master cylinder and proportioning valve to go with the calipers.

unclewatts · 09-03-2009, 02:58 PM

Make sure you get the right length pushrod that goes between the MC and the booster.

CMC67 · 09-04-2009, 09:01 PM

So if I get a replacement booster which is a bendix style on my truck, the pushrod should be correct? Then get a disk brake m/c and my only worries should be the lines goin in to m/c and if the prop valve is correct. How to tell if prop valve is working properly? I also looked at autozone boosters are all the same between years.

KrazyRay · 09-04-2009, 09:38 PM

I also noticed that the booster mounting brackets are longer on the disc brakes than the drums. I think they are about 5 1/2 inches long and the drums are about 3 1/2 inches.

unclewatts · 09-04-2009, 10:41 PM

Quote:

Originally Posted by CMC67

So if I get a replacement booster which is a bendix style on my truck, the pushrod should be correct? Then get a disk brake m/c and my only worries should be the lines goin in to m/c and if the prop valve is correct. How to tell if prop valve is working properly? I also looked at autozone boosters are all the same between years.

As long as you are using the same type of booster I'm pretty sure that the pushrod will be the same. When you get everything installed and the system properly bled take a drive and slam the brakes on. If the rear tires lock up about the same time that the fronts do and you don't have a brake warning light, then your prop valve is working OK. If the rear end locks up real early or not at all, then you have the wrong/defective prop valve.

mbgmike · 09-05-2009, 10:20 AM

Here are some pics
they left is a Delco

the right is a Bendix

You can get a new replacement master cylinder with an adaptor piston rod to work with manual or power brakes. We sell them. We also sell New Delco style boosters.

SCOTI · 09-05-2009, 10:45 AM

Quote:

Originally Posted by mbgmike

....You can get a new replacement master cylinder with an adaptor piston rod to work with manual or power brakes. We sell them. We also sell New Delco style boosters.

Good to know. I made mine using part of my original & part of the one from the donor truck.

CMC67 · 09-05-2009, 02:28 PM

thanks for all the help and advise. I let yall know what happens.

mbgmike · 09-06-2009, 12:55 AM

Quote:

Originally Posted by CMC67

thanks for all the help and advise. I let yall know what happens.

If you need help let us know. We do brakes.

09-02-2009, 08:59 PM	#1
CMC67 Registered User Join Date: Jun 2009 Location: Eastpointe,MI Posts: 7	disks installed which booster and m/c? I installed disks up front on my 67 from a 72. The booster and m/c on there was already on the truck but both are shot. So do I get a 67 replacement booster and m/c or use set up from disk brake equipped truck? Please help.

09-02-2009, 10:25 PM	#2
CMC67 Registered User Join Date: Jun 2009 Location: Eastpointe,MI Posts: 7	Re: disks installed which booster and m/c? should I use 67 master cyl. or 71-72

09-03-2009, 12:16 AM	#3
unclewatts 70 Chevrolet=Obsession Join Date: Jun 2009 Location: nice ca Posts: 1,067	Re: disks installed which booster and m/c? The 67 MC is a drum MC. The 72 MC is a disk MC with a larger capacity reservoir. I would very strongly recommend using 72 MC. The booster I'm pretty sure is the same for both disk or drum brakes. Find out what kind of booster the truck you got the disks from had. Be aware the GM offered both Delco and Bendix boosters for 71-72 half ton trucks. If it's a big pancake looking thing that's black, it's a Delco. If it's more cannister shaped and gold, it's a Bendix. Also, buy a new/rebuilt MC and booster. that way you know you have a safe braking system. BTW, I think you have to change out the old drum prop valve for a newer disk prop valve or an adjustable one. Sorry I'm spending all your money but you wanna do it right when it comes to brakes. __________________ I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner) Last edited by unclewatts; 09-03-2009 at 02:54 PM.

09-03-2009, 01:26 AM	#4
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: disks installed which booster and m/c? You may also need a new prop valve for Disc/Drum

09-03-2009, 01:27 AM	#5
SIXT8LOU Registered User Join Date: Oct 2007 Location: Corona,Ca Posts: 146	Re: disks installed which booster and m/c? what else to you switch out to make the swap work?? thanks __________________ 68 C/10 short bed 77 C/20 silverado long bed 05 GMC Duramax Crew

09-03-2009, 07:28 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: disks installed which booster and m/c? For disC brake swaps you want to get the master cylinder and proportioning valve to go with the calipers. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-03-2009, 02:58 PM	#7
unclewatts 70 Chevrolet=Obsession Join Date: Jun 2009 Location: nice ca Posts: 1,067	Re: disks installed which booster and m/c? Make sure you get the right length pushrod that goes between the MC and the booster. __________________ I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner)

09-04-2009, 09:01 PM	#8
CMC67 Registered User Join Date: Jun 2009 Location: Eastpointe,MI Posts: 7	Re: disks installed which booster and m/c? So if I get a replacement booster which is a bendix style on my truck, the pushrod should be correct? Then get a disk brake m/c and my only worries should be the lines goin in to m/c and if the prop valve is correct. How to tell if prop valve is working properly? I also looked at autozone boosters are all the same between years.

09-04-2009, 09:38 PM	#9
KrazyRay Registered User Join Date: Jun 2009 Location: Oroville, CA Posts: 4,827	Re: disks installed which booster and m/c? I also noticed that the booster mounting brackets are longer on the disc brakes than the drums. I think they are about 5 1/2 inches long and the drums are about 3 1/2 inches.

09-05-2009, 10:20 AM	#11
mbgmike Registered User Join Date: Aug 2005 Location: Pasadena,Tx /Pto Pta DR Posts: 5,415	Re: disks installed which booster and m/c? Here are some pics they left is a Delco the right is a Bendix You can get a new replacement master cylinder with an adaptor piston rod to work with manual or power brakes. We sell them. We also sell New Delco style boosters. Attached Images Last edited by mbgmike; 09-05-2009 at 10:20 AM.

09-05-2009, 02:28 PM	#13
CMC67 Registered User Join Date: Jun 2009 Location: Eastpointe,MI Posts: 7	Re: disks installed which booster and m/c? thanks for all the help and advise. I let yall know what happens.



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