4Wheel disk brake question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mudder · 02-05-2012, 09:56 AM

What is everyone using for the master and booster that have gone with the rear disks? Nice to find something that is a bolt on. Mine have been decent but the seals in the master go bad every once in a while.

freakshow108 · 02-05-2012, 12:05 PM

Check out Frank on the board he goes by Pickmup. I have a 71 K20 that I converted to 4 wheel disc and he set me up with a firewall forward kit for a smoking price. Hope this helps.
Posted via Mobile Device

6600DURAMAX · 02-05-2012, 01:11 PM

I am just using an ebay hydro boost unit with a disc/disc master and proportioning valve. Works great till the power steering belt jumps off. hahaha

**argonaut** · 02-05-2012, 07:48 PM

I have a CPP setup. Its an 8" dual diaphragm booster with what I believe is a corvette type master cylinder and an aftermarket proportioning valve.

ghettoluxury · 02-05-2012, 11:40 PM

Factory GM hydroboost from 73-87.

rocket20 · 02-06-2012, 10:56 AM

did you guys get a kit or put it together from junk yard or parts store

6600DURAMAX · 02-07-2012, 08:56 AM

Some pics of my setup, I really needed the hydroboost since my cam only makes about 8-9 inches of vacumm at idle in park and around 5-7 in gear.

I bought the master and prop valve from PirateJack, hoses were custom made, and the hydro boost was a new Ebay item. bolted up faily easily just had to cut and weld my brake rod

**argonaut** · 02-07-2012, 03:25 PM

Mine was a kit from CPP. It came pre-assembled with bracket, booster, master cylinder and prop valve, and push rod. I had to modify the pushrod a bit to get the correct length and made a new hole in the pedal arm to mount the pushrod to. I also had to add two additional holes to the firewall to mount the bracket.
My rebuilt, stockish 402 big block pulls plenty of vacuum at idle so the vacuum diaphragm booster works well for me.

Burt4x4 · 02-07-2012, 05:23 PM

I used a K30 Booster/Master (Dual diaphram)(plumed oppisite of the 1/2ton master).
My P-valve is still stock 1972. My disk brakes work but I still want to open up the P-valve and remove the guts for the rear and instal in-line adj. P-valve...or they even sell a replacement 4wheel disk p-valve a few have used...

rocket20 · 02-09-2012, 09:50 PM

do you recomend the hydro boost setup ... how is the pedel responce

02-05-2012, 09:56 AM	#1
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,339	4Wheel disk brake question? What is everyone using for the master and booster that have gone with the rear disks? Nice to find something that is a bolt on. Mine have been decent but the seals in the master go bad every once in a while.

02-05-2012, 12:05 PM	#2
freakshow108 Registered User Join Date: May 2010 Location: Eatonville WA Posts: 296	Re: 4Wheel disk brake question? Check out Frank on the board he goes by Pickmup. I have a 71 K20 that I converted to 4 wheel disc and he set me up with a firewall forward kit for a smoking price. Hope this helps. Posted via Mobile Device

02-05-2012, 01:11 PM	#3
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,107	Re: 4Wheel disk brake question? I am just using an ebay hydro boost unit with a disc/disc master and proportioning valve. Works great till the power steering belt jumps off. hahaha __________________ 1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years

02-05-2012, 07:48 PM	#4
argonaut Senior Member Join Date: Aug 2008 Location: Long Beach, CA Posts: 1,813	Re: 4Wheel disk brake question? I have a CPP setup. Its an 8" dual diaphragm booster with what I believe is a corvette type master cylinder and an aftermarket proportioning valve. __________________ Jason M. @argonaut62 1972 K5 Blazer CST, Turquoise 1966 K20 Short Fleet Pickup, Big Ugly 1964 C10 Short Fleet, Gertrude 2001 Porsche 911 Carrera 1996 Ford Bronco XLT 1980 Jeep Wagoneer 2008 Honda CBR1000RR 2005 Honda RC51 1981 Honda CB750C No dis-assemble Johnny Five! No dis-assemble!

02-05-2012, 11:40 PM	#5
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 1,991	Re: 4Wheel disk brake question? Factory GM hydroboost from 73-87. __________________ 1949 Five Window, 1973 Step Side, 2000 Z71

02-06-2012, 10:56 AM	#6
rocket20 Registered User Join Date: Apr 2011 Location: Omaha NE Posts: 63	Re: 4Wheel disk brake question? did you guys get a kit or put it together from junk yard or parts store

02-07-2012, 08:56 AM	#7
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,107	Re: 4Wheel disk brake question? Some pics of my setup, I really needed the hydroboost since my cam only makes about 8-9 inches of vacumm at idle in park and around 5-7 in gear. I bought the master and prop valve from PirateJack, hoses were custom made, and the hydro boost was a new Ebay item. bolted up faily easily just had to cut and weld my brake rod Attached Images __________________ 1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years

02-07-2012, 03:25 PM	#8
argonaut Senior Member Join Date: Aug 2008 Location: Long Beach, CA Posts: 1,813	Re: 4Wheel disk brake question? Mine was a kit from CPP. It came pre-assembled with bracket, booster, master cylinder and prop valve, and push rod. I had to modify the pushrod a bit to get the correct length and made a new hole in the pedal arm to mount the pushrod to. I also had to add two additional holes to the firewall to mount the bracket. My rebuilt, stockish 402 big block pulls plenty of vacuum at idle so the vacuum diaphragm booster works well for me. __________________ Jason M. @argonaut62 1972 K5 Blazer CST, Turquoise 1966 K20 Short Fleet Pickup, Big Ugly 1964 C10 Short Fleet, Gertrude 2001 Porsche 911 Carrera 1996 Ford Bronco XLT 1980 Jeep Wagoneer 2008 Honda CBR1000RR 2005 Honda RC51 1981 Honda CB750C No dis-assemble Johnny Five! No dis-assemble!

02-07-2012, 05:23 PM	#9
Burt4x4 Registered User Join Date: Feb 2000 Location: Modesto, CA Posts: 1,842	Re: 4Wheel disk brake question? I used a K30 Booster/Master (Dual diaphram)(plumed oppisite of the 1/2ton master). My P-valve is still stock 1972. My disk brakes work but I still want to open up the P-valve and remove the guts for the rear and instal in-line adj. P-valve...or they even sell a replacement 4wheel disk p-valve a few have used... __________________ 1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks

02-09-2012, 09:50 PM	#10
rocket20 Registered User Join Date: Apr 2011 Location: Omaha NE Posts: 63	Re: 4Wheel disk brake question? do you recomend the hydro boost setup ... how is the pedel responce



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