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

**j_cst_10** · 02-08-2009, 09:32 PM

First off, I want to say thanks for the great tech support this sit has to offer, I will be a paying member shortly because I have some parts to sell and possibly a truck.

The question: Is there any difference between a power booster from a '70 with drum brakes or a booster from a 72 with discs?

The reason is I have a 72 with disc brakes that I wanted to swap on my 70 and I purchased a whole power assisted booster/master cylinder set-up off of a 72 to have power brakes. I am unsure now what I want to do with the 72 and wanted to see what my options are.

I want power brakes on my 70 regardless. Can I just switch master cylinders on the booster and use it for the drum '70?

68gmsee · 02-08-2009, 11:12 PM

Since you have all the equipment, swap it out and give it a try. It's really not that difficult to convert.

Keep the same master cylinder and proportional valve from the 70. Just unbolt it from the firewall and without removing the brake lines, carefully move it forward to give you enough room to install the booster and bracket.

Don't forget you also have to change the pushrod. This is probably the harder thing to do on this conversion since you have to work upside down under the steering column.

**El Jay** · 02-08-2009, 11:51 PM

Here's how it's done, complete with some most excellent pictures.

http://67-72chevytrucks.com/vboard/s...d.php?t=221598
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**j_cst_10** · 02-09-2009, 08:12 PM

Man, this site is pretty damn good I must say.

Longhorn Man · 02-09-2009, 09:44 PM

i know it has been done... but I also know that when I tried it on my one ton, it was a no go. Tried it a few times.... been a few years now though ('02) and I have no idea what the problem was.

02-08-2009, 09:32 PM	#1
j_cst_10 Senior Member Join Date: Nov 2008 Location: Cleveland, OH Posts: 588	Power brake question First off, I want to say thanks for the great tech support this sit has to offer, I will be a paying member shortly because I have some parts to sell and possibly a truck. The question: Is there any difference between a power booster from a '70 with drum brakes or a booster from a 72 with discs? The reason is I have a 72 with disc brakes that I wanted to swap on my 70 and I purchased a whole power assisted booster/master cylinder set-up off of a 72 to have power brakes. I am unsure now what I want to do with the 72 and wanted to see what my options are. I want power brakes on my 70 regardless. Can I just switch master cylinders on the booster and use it for the drum '70?

02-08-2009, 11:12 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Power brake question Since you have all the equipment, swap it out and give it a try. It's really not that difficult to convert. Keep the same master cylinder and proportional valve from the 70. Just unbolt it from the firewall and without removing the brake lines, carefully move it forward to give you enough room to install the booster and bracket. Don't forget you also have to change the pushrod. This is probably the harder thing to do on this conversion since you have to work upside down under the steering column. Last edited by 68gmsee; 02-08-2009 at 11:12 PM.

02-08-2009, 11:51 PM	#3
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Power brake question Here's how it's done, complete with some most excellent pictures. http://67-72chevytrucks.com/vboard/s...d.php?t=221598 __________________ __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

02-09-2009, 08:12 PM	#4
j_cst_10 Senior Member Join Date: Nov 2008 Location: Cleveland, OH Posts: 588	Re: Power brake question Man, this site is pretty damn good I must say.

02-09-2009, 09:44 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Power brake question i know it has been done... but I also know that when I tried it on my one ton, it was a no go. Tried it a few times.... been a few years now though ('02) and I have no idea what the problem was.



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