Help with Power brake conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

red450ih · 09-30-2003, 04:56 PM

I got a complete power brake booster from a 73 GMC and put it on my 74 Chevrolet. It bolted up fine, but when I tried to slide the PB rod onto the brake pedal it wouldnt go. I then looked at the manual master cyl and the hole is bigger on the end. Do I need to get a booster from a 74, or do I need to get a PB pedal assembly? I was going to drill the hole out, but there is not enough material on either side to allow that. I thought this would be a smooth bolt on, but guess not.

Thanks,
Keith

79BIG10 · 09-30-2003, 05:59 PM

I know on my PB rod I could loosen it up and take it off and place on the new one. Can you change them out by just unscrewing the rod itself? Also when you get ready to test it out don't fasten the retaining pin in the brake pedal assembly since you can make your brakes apply sooner or slower by adjusting the length on the same rod. The longer it is the faster the brakes start being applied.

**Captkaos** · 10-01-2003, 11:05 AM

Sounds like you need the rod from the '73. The manual and power rods are different, or am I missunderstanding you? I put an '86 booster on my '73 with no problems.

red450ih · 10-02-2003, 05:02 AM

The 73 booster rod does not have a hole large enough to fit onto the 74 brake pedal "attach point."

Thanks,
Keith

79BIG10 · 10-02-2003, 05:14 PM

I understand the brake attch point part but the 74 won't screw on like the 73 did? Or did the 73 not have it where you can adjust the linkage out?

red450ih · 10-03-2003, 01:11 PM

Brandon,

My 74 has manual brakes and there is no adjustment like the power booter from the 73. Maybe the later boosters have a larger hole in the rod. The length isn't a problem right now.

Thanks,
Keith

09-30-2003, 04:56 PM	#1
red450ih Registered User Join Date: Mar 2001 Location: Nashville, Tennessee Posts: 225	Help with Power brake conversion I got a complete power brake booster from a 73 GMC and put it on my 74 Chevrolet. It bolted up fine, but when I tried to slide the PB rod onto the brake pedal it wouldnt go. I then looked at the manual master cyl and the hole is bigger on the end. Do I need to get a booster from a 74, or do I need to get a PB pedal assembly? I was going to drill the hole out, but there is not enough material on either side to allow that. I thought this would be a smooth bolt on, but guess not. Thanks, Keith __________________ GMC

09-30-2003, 05:59 PM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	I know on my PB rod I could loosen it up and take it off and place on the new one. Can you change them out by just unscrewing the rod itself? Also when you get ready to test it out don't fasten the retaining pin in the brake pedal assembly since you can make your brakes apply sooner or slower by adjusting the length on the same rod. The longer it is the faster the brakes start being applied. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

10-01-2003, 11:05 AM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Sounds like you need the rod from the '73. The manual and power rods are different, or am I missunderstanding you? I put an '86 booster on my '73 with no problems. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

10-02-2003, 05:02 AM	#4
red450ih Registered User Join Date: Mar 2001 Location: Nashville, Tennessee Posts: 225	The 73 booster rod does not have a hole large enough to fit onto the 74 brake pedal "attach point." Thanks, Keith __________________ GMC

10-02-2003, 05:14 PM	#5
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	I understand the brake attch point part but the 74 won't screw on like the 73 did? Or did the 73 not have it where you can adjust the linkage out? __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

10-03-2003, 01:11 PM	#6
red450ih Registered User Join Date: Mar 2001 Location: Nashville, Tennessee Posts: 225	Brandon, My 74 has manual brakes and there is no adjustment like the power booter from the 73. Maybe the later boosters have a larger hole in the rod. The length isn't a problem right now. Thanks, Keith __________________ GMC

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