OK If I upgrade to power discs do I have to change the booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Vince M · 12-02-2002, 08:53 PM

Started looking for a front member today to replace the one on my 68 that has power drum brakes. Im looking for a 71-72 unit (with discs) but was wondering if it would be necessary to change the power booster and master cylinder with it. Anything else I should be concerned about.

crazy longhorn · 12-02-2002, 10:50 PM

I think you will be ok on the booster, but will need to replace the master,lines & the prop valve.....

Mike C · 12-02-2002, 10:51 PM

I have the power drum booster on my truck and did the disc conversion. The brakes work AWESOME at highway speeds (high vacuum), but at slow speeds, sometimes takes a LOT of pedal. I do have a Crower 270 cam however. I plan on swapping to the disc booster eventually when I get it off of my Suburban.

gashog · 12-02-2002, 11:00 PM

You'll need a disc brake master cyl. and a proportioning valve. I like to buy new one's for reliability, their not that expensive.
I used my old power drum booster with no problems. Lines wll also be different so get everything you can from the doner truck, It will make life a lot easier.

Hooter · 12-02-2002, 11:05 PM

Mine as well replace the old sacked put booster anyways while everything is apart. Because brakes are somewhat important

Vince M · 12-02-2002, 11:49 PM

I found a donor vehicle (71) that's got everything complete on it so I'm going to look at it this weekend. Guy wants $50 for the stuff so I can't go wrong. He already sold the rear end out of it so I'll be hunting one of them next. 5 Lug on the front and 6 on the rear doesn't sound like a good idea.

Thanks everyone for the help. I'll be asking a bunch more ?'s once I get deeper into it.

12-02-2002, 08:53 PM	#1
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	OK If I upgrade to power discs do I have to change the booster Started looking for a front member today to replace the one on my 68 that has power drum brakes. Im looking for a 71-72 unit (with discs) but was wondering if it would be necessary to change the power booster and master cylinder with it. Anything else I should be concerned about. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.

12-02-2002, 10:50 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I think you will be ok on the booster, but will need to replace the master,lines & the prop valve..... __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

12-02-2002, 10:51 PM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	I have the power drum booster on my truck and did the disc conversion. The brakes work AWESOME at highway speeds (high vacuum), but at slow speeds, sometimes takes a LOT of pedal. I do have a Crower 270 cam however. I plan on swapping to the disc booster eventually when I get it off of my Suburban. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

12-02-2002, 11:00 PM	#4
gashog Active Member Join Date: Oct 2002 Location: Lake co. california Posts: 192	You'll need a disc brake master cyl. and a proportioning valve. I like to buy new one's for reliability, their not that expensive. I used my old power drum booster with no problems. Lines wll also be different so get everything you can from the doner truck, It will make life a lot easier. __________________ 69 Custom/10 454 Turbo 400 and 70 Custom/20 350 Turbo 350, 73 cheyanne C/10 also 69 camaro Z/28 and 85 Iroc Z

12-02-2002, 11:05 PM	#5
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	Mine as well replace the old sacked put booster anyways while everything is apart. Because brakes are somewhat important __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

12-02-2002, 11:49 PM	#6
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	I found a donor vehicle (71) that's got everything complete on it so I'm going to look at it this weekend. Guy wants $50 for the stuff so I can't go wrong. He already sold the rear end out of it so I'll be hunting one of them next. 5 Lug on the front and 6 on the rear doesn't sound like a good idea. Thanks everyone for the help. I'll be asking a bunch more ?'s once I get deeper into it. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.



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