Power Drum Brakes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JRBECK64 · 05-18-2010, 08:40 PM

I had a power booster on my 69 when I tore it apart and now I am using a frame that has drum brakes all around that I rebuilt. The question is there is a proportioning valve under my drum brake master cylinder so could I attach the power unit to the drum brake master cylinder to create power drum brakes? Has anyone done this? If so please let me know how they work.

Thanks,
JRBECK64

junkyardjohn · 05-19-2010, 07:07 AM

YES YOU CAN & YES I HAVE. 69s HAD DRUM BRAKES ALL AROUND ALSO. THE P/B BOOSTER & PROP. VALVE PERFORM TWO COMPLETELY DIFFERENT FUNTIONS & WORK IDEPENDANTLY OF EACH OTHER.

JOHN (I THINK THATS WHAT YOU ARE ASKING)

68gmsee · 05-19-2010, 09:42 AM

I converted my 69 to power brakes many years ago and never had an issue. I used all of the components including the prop. valve from the donor truck.

I converted my 68 GMC but I used the combination valve that it had. I was constantly getting rear wheel lockup and scaring everyone with the screeching brake sound so I converted back to manual brakes.

You can purchase an adjustable proportioning valve if you encounter this problem.

forgot to include this:
http://www.chevyhiperformance.com/te...lve/index.html

JRBECK64 · 05-19-2010, 12:39 PM

Quote:

Originally Posted by junkyardjohn

YES YOU CAN & YES I HAVE. 69s HAD DRUM BRAKES ALL AROUND ALSO. THE P/B BOOSTER & PROP. VALVE PERFORM TWO COMPLETELY DIFFERENT FUNTIONS & WORK IDEPENDANTLY OF EACH OTHER.

JOHN (I THINK THATS WHAT YOU ARE ASKING)

Thanks for the info. I am going to give it a try and see how they work. If I need to, I will buy an adjustable proportioning valve if there is any lock up issues. With the size tires I am putting on this truck and just the weight of the truck I would feel better with my Son having power brakes. If these dont get the job done I will do a Disc Brake conversion and I will determine that before my Son drives it. I have had people in the past tell me that when you power assist these drums they really work good so we will see how it goes.
Thanks again.

JRBECK64

dauntless_powered · 05-19-2010, 01:35 PM

I have power drums on my 67 and they work great. Right now she is pulling to the left when you apply them, I have not investigated this yet.

05-18-2010, 08:40 PM	#1
JRBECK64 Registered User Join Date: Sep 2008 Location: Cornelius Oregon Posts: 1,073	Power Drum Brakes? I had a power booster on my 69 when I tore it apart and now I am using a frame that has drum brakes all around that I rebuilt. The question is there is a proportioning valve under my drum brake master cylinder so could I attach the power unit to the drum brake master cylinder to create power drum brakes? Has anyone done this? If so please let me know how they work. Thanks, JRBECK64

05-19-2010, 07:07 AM	#2
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,425	Re: Power Drum Brakes? YES YOU CAN & YES I HAVE. 69s HAD DRUM BRAKES ALL AROUND ALSO. THE P/B BOOSTER & PROP. VALVE PERFORM TWO COMPLETELY DIFFERENT FUNTIONS & WORK IDEPENDANTLY OF EACH OTHER. JOHN (I THINK THATS WHAT YOU ARE ASKING) __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST Last edited by junkyardjohn; 05-19-2010 at 07:09 AM.

05-19-2010, 09:42 AM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Power Drum Brakes? I converted my 69 to power brakes many years ago and never had an issue. I used all of the components including the prop. valve from the donor truck. I converted my 68 GMC but I used the combination valve that it had. I was constantly getting rear wheel lockup and scaring everyone with the screeching brake sound so I converted back to manual brakes. You can purchase an adjustable proportioning valve if you encounter this problem. forgot to include this: http://www.chevyhiperformance.com/te...lve/index.html Last edited by 68gmsee; 05-19-2010 at 09:45 AM.

05-19-2010, 01:35 PM	#5
dauntless_powered Registered User Join Date: Aug 2008 Location: groton, ct Posts: 152	Re: Power Drum Brakes? I have power drums on my 67 and they work great. Right now she is pulling to the left when you apply them, I have not investigated this yet. __________________ Erik 1967 K10 SWB Big Window - Bone Stock 1955 JEEP CJ5 13K orig miles (Resto waiting patiently in the garage)



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