69 Power Brake Upgrade - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**lawest** · 02-02-2011, 02:46 AM

I am swapping out the axles on my 69 4X4 with a donor set from a '78. Since my '69 also has manual brakes I was going to try to use the power booster from the /78 as well. Does anyone know if this will work, and if not, where can I get the right booster. Thanks.

**lawest** · 02-12-2011, 12:28 AM

Anyone?

**Yukon Jack** · 02-14-2011, 11:17 AM

You may have to do something with the rod that attaches to your brake pedal - the length could be different. I believe you will also find your hard lines that go to your master will be different so you will need some adapter fittings to go from one size to another.

You'll be going from all drums to disks up front so you will need to use the 78's proportioning valve also. I did a similar change on my 70 K5 and went ahead and just made all new front hard lines so I didn't have to have adapter fittings. The 78's rubber front brake lines are different than you 69 and also require adapter fittings - when I figured that, that is when I decided to run all new hard lines up front. Hated to have adapter fittings at the master and also had the rubber line connection.

I think the hard line for the rear brakes fit the rubber hose at the rear axle, but I'm not 100% sure about that.

**lawest** · 02-25-2011, 09:04 PM

Thanks alot Jack, sounds like it is definitely doable. Do you remember if the brake pedal rod just needs to be cut off, or am I going to have to fabricate something?

GMCMAX · 02-26-2011, 12:23 AM

Followed the booster bracket trimming and coupler pics in this thread when I put a 73 booster/master on my 68.
http://67-72chevytrucks.com/vboard/s...d.php?t=215980
I had to drill one more hole on each side of the brackets to mate the firewall. No mod to the pedal arm on mine.

Max

02-02-2011, 02:46 AM	#1
lawest Registered User Join Date: Jan 2008 Location: Tuttle, OK Posts: 205	69 Power Brake Upgrade I am swapping out the axles on my 69 4X4 with a donor set from a '78. Since my '69 also has manual brakes I was going to try to use the power booster from the /78 as well. Does anyone know if this will work, and if not, where can I get the right booster. Thanks. __________________ 69 K10 SWB Project Dream '69 2011 K2500 Silverado Beat to fit, Paint to match Dream '69 Build Thread

02-12-2011, 12:28 AM	#2
lawest Registered User Join Date: Jan 2008 Location: Tuttle, OK Posts: 205	Re: 69 Power Brake Upgrade Anyone? __________________ 69 K10 SWB Project Dream '69 2011 K2500 Silverado Beat to fit, Paint to match Dream '69 Build Thread

02-14-2011, 11:17 AM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: 69 Power Brake Upgrade You may have to do something with the rod that attaches to your brake pedal - the length could be different. I believe you will also find your hard lines that go to your master will be different so you will need some adapter fittings to go from one size to another. You'll be going from all drums to disks up front so you will need to use the 78's proportioning valve also. I did a similar change on my 70 K5 and went ahead and just made all new front hard lines so I didn't have to have adapter fittings. The 78's rubber front brake lines are different than you 69 and also require adapter fittings - when I figured that, that is when I decided to run all new hard lines up front. Hated to have adapter fittings at the master and also had the rubber line connection. I think the hard line for the rear brakes fit the rubber hose at the rear axle, but I'm not 100% sure about that. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

02-25-2011, 09:04 PM	#4
lawest Registered User Join Date: Jan 2008 Location: Tuttle, OK Posts: 205	Re: 69 Power Brake Upgrade Thanks alot Jack, sounds like it is definitely doable. Do you remember if the brake pedal rod just needs to be cut off, or am I going to have to fabricate something? __________________ 69 K10 SWB Project Dream '69 2011 K2500 Silverado Beat to fit, Paint to match Dream '69 Build Thread

02-26-2011, 12:23 AM	#5
GMCMAX Active Member Join Date: Jan 2006 Location: Lower Mid-East Ca. Posts: 326	Re: 69 Power Brake Upgrade Followed the booster bracket trimming and coupler pics in this thread when I put a 73 booster/master on my 68. http://67-72chevytrucks.com/vboard/s...d.php?t=215980 I had to drill one more hole on each side of the brackets to mate the firewall. No mod to the pedal arm on mine. Max __________________ Never try to teach a pig to sing; it wastes your time and annoys the pig! Gets More Chicks My lugnuts require more torque than your honda makes! 68 GMC, 4X4 conversion w/73 k20 running gear and springs, 350 4spd, 4.10's, D44 powerlok front, 14BFF govlock rear, 33" tires, lifted 4". Last edited by GMCMAX; 02-26-2011 at 12:29 AM.



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