manual to power brake conversion stick truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**old Rusty C10** · 11-13-2014, 01:44 PM

My latest creation is a 74 stepside made out of parts that I had or came with the chasis or from my donor 79 c20
Heres the question

The cab I had was originally a manual brake cab. The reason I say this is because every one of the cabs ive seen with the power brake setup they have an extra couple of studs in the upper part of the mounting for the brake assemvbly . This cab does not.

My questions are as follows as I am havng problems finding the brake linkages
Can I just install the brake booster/master from the 79 into this truck and leave out the two top bolts?

I need to change the pedal assembly in this truck from a automatic to a 3 speed stick setup.. Will the linkages be different there for the brake pedal?
Lastly will I need to change the rotors calipers drums and rear brake assemblies because of the change of setup?
Pics of the donor truck and the build enclosed for review

Just for fun I have the original sticker from the truck that I have the complete drivetrain , chassis, and harness from and it is as follows
Model cc10703
Killarney green
Fleetisde pickup box
Manual Disc/drum brake
Heavy duty clutch
cloth seat trim
Slate green Vimyl int
Heavy duty rear spring
L6 engine 250 CID
Painted rear bumper

mattybilt79 · 11-13-2014, 02:56 PM

Actually the power and hydro boosters are available with both patterns from my recent experience of getting a replacement hydroboost. Parts store had listings for 4 bolt and 6 (H) pattern boosters. The brake rod that attaches to the pedal should be matched to the booster/master you use because there are different lengths but you should be able to use all the parts and swap them straight across. The brakes should work fine but may need a manual adjuster put in to dial brake pressure down to the rears front discs shouldn't need to change anything.

KrazyRay · 11-13-2014, 04:41 PM

I did a manual to power brake upgrade a few months ago on a 77 and I just used the 4 bolts. Also, I had to change out the brake pedal because the hole for the rod is a different diameter between manual and power brakes.

11-13-2014, 01:44 PM	#1
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	manual to power brake conversion stick truck My latest creation is a 74 stepside made out of parts that I had or came with the chasis or from my donor 79 c20 Heres the question The cab I had was originally a manual brake cab. The reason I say this is because every one of the cabs ive seen with the power brake setup they have an extra couple of studs in the upper part of the mounting for the brake assemvbly . This cab does not. My questions are as follows as I am havng problems finding the brake linkages Can I just install the brake booster/master from the 79 into this truck and leave out the two top bolts? I need to change the pedal assembly in this truck from a automatic to a 3 speed stick setup.. Will the linkages be different there for the brake pedal? Lastly will I need to change the rotors calipers drums and rear brake assemblies because of the change of setup? Pics of the donor truck and the build enclosed for review Just for fun I have the original sticker from the truck that I have the complete drivetrain , chassis, and harness from and it is as follows Model cc10703 Killarney green Fleetisde pickup box Manual Disc/drum brake Heavy duty clutch cloth seat trim Slate green Vimyl int Heavy duty rear spring L6 engine 250 CID Painted rear bumper Attached Images __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-13-2014, 02:56 PM	#2
mattybilt79 Registered User Join Date: Nov 2014 Location: Arizona mostly Posts: 114	Re: manual to power brake conversion stick truck Actually the power and hydro boosters are available with both patterns from my recent experience of getting a replacement hydroboost. Parts store had listings for 4 bolt and 6 (H) pattern boosters. The brake rod that attaches to the pedal should be matched to the booster/master you use because there are different lengths but you should be able to use all the parts and swap them straight across. The brakes should work fine but may need a manual adjuster put in to dial brake pressure down to the rears front discs shouldn't need to change anything. Last edited by mattybilt79; 11-13-2014 at 03:07 PM.

11-13-2014, 04:41 PM	#3
KrazyRay Registered User Join Date: Jun 2009 Location: Oroville, CA Posts: 4,827	Re: manual to power brake conversion stick truck I did a manual to power brake upgrade a few months ago on a 77 and I just used the 4 bolts. Also, I had to change out the brake pedal because the hole for the rod is a different diameter between manual and power brakes.



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