Which hydroboost unit for a swap? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

B_derK20 · 09-04-2011, 01:00 AM

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!

BLE 'BURBAN · 09-04-2011, 03:38 AM

I'd use the 84 model myself.

83GMCK2500 · 09-12-2011, 01:57 AM

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.

09-04-2011, 01:00 AM	#1
B_derK20 Registered User Join Date: Apr 2011 Location: Clifton, CO Posts: 76	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!

09-04-2011, 03:38 AM	#2
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: Which hydroboost unit for a swap? I'd use the 84 model myself. __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

09-12-2011, 01:57 AM	#3
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	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. __________________ Devin 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 My Introduction with my '83s History New Daily, the '96



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