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Old 09-04-2011, 01:00 AM   #1
B_derK20
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Join Date: Apr 2011
Location: Clifton, CO
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Which hydroboost unit for a swap?

I'm getting ready to dump the vaccum assist brakes and swap over to a hydroboost setup, but I'm not sure which of these 2 units I want. The first unit was pulled out of an '84 K20 with a 6.2 and the other unit I have came from a '78 C30 with a 350. I got the pedals and everything in between from both trucks, and it looks like it should be a straight-foward deal. The master off of the C30 is larger than the one from the K20, but the hydroboost itself from the K20 looks to be in a little better shape. Can I swap master cylinders from one to the other or will both setups be the same? The truck receiving the swap is my '83 K20.

Thanks in advance!
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Old 09-04-2011, 03:38 AM   #2
BLE 'BURBAN
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Re: Which hydroboost unit for a swap?

I'd use the 84 model myself.
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Old 09-12-2011, 01:57 AM   #3
83GMCK2500
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Re: Which hydroboost unit for a swap?

Been thinking about upgrading to hydroboost on mine, I am curious if all hydroboost units were created equal? I know master cylinders have different bore sizes, but know have found nothing about the HB units.
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1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt
1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050
1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350

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