Okay guys needs some brake help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

king-918 · 04-03-2015, 02:13 AM

My 86 SWB has never had brakes since I owned it now I need a good aftermarket adjustable proportioning valve and hopefully a link on brake lines, thanks in advance

D13 · 04-03-2015, 08:03 AM

Inline Tube for the lines, buy the stainless, NAPA for hoses, Raybestos or AC from FLPA or Rock Auto for calipers etc. Why do you need an adjustable valve? Did you go disc on the rear? Otherwise look at a stock set up.

**hatzie** · 04-03-2015, 10:40 AM

4wheel disc conversions don't need an adjustable combination valve. Several options exist for drop-in fixed combination valves that are properly balanced for disc/disc systems.
Here's one of them from Right Stuff.
http://www.jegs.com/i/Right-Stuff/96...ductId=1502558

I assume you are installing a Master Cylinder/Power Assist biased for Disc/Disc systems... If you aren't changing at least the Master Cylinder to a Disc/Disc unit stick with the Disc/Drum combination valve.

king-918 · 04-03-2015, 12:42 PM

Thanks for the reply. I do still have the stock booster and master but they can be replaced too. the truck and been converted to rear disk and the bed will constantly hold Atleast 300 lbs of extra weight.

king-918 · 04-03-2015, 12:51 PM

Quote:

Originally Posted by D13

Inline Tube for the lines, buy the stainless, NAPA for hoses, Raybestos or AC from FLPA or Rock Auto for calipers etc. Why do you need an adjustable valve? Did you go disc on the rear? Otherwise look at a stock set up.

Do you know what the lines are called by any chance or part#

**hatzie** · 04-03-2015, 01:03 PM

If you don't want to convert the MC & Booster keep the factory combination valve & install an adjustable bias valve in the rear brake line.

Wilwood, Tilton, Baer, etc make an inline rotary "Proportioning" valve to adjust the rear brake bias. I'd stay away from the adjustable combination valves.

I will say this... Some of the bias is controlled by the piston sizes in the MC and rear calipers.
I've converted two 1970's German Water Cooled A1 VW's to 4wheel disc brakes using late 1990's A3 VW rear disc components. I didn't change anything but the rear brake and stub axles. They didn't lock the rear wheels even in simulated panic stops. They did cut my braking distance down significantly.

You may want to assemble the system, bleed it, and test drive very late at night in a large empty mall type parking lot or long dead-end commercial street. Bring a couple friends to help, take some tape measurements, put out some cheap cones, and write a bunch of stuff down. If your local LEO are not complete asshats and you are obviously serious they won't bother you.

**MikeB** · 04-03-2015, 05:26 PM

If your truck's tires are the same size front & rear, and you are using stock calipers and discs, with drums on the rear, then go ahead and use the factory type proportioning valve.

If your rear tires are taller than the fronts, or if you have larger rotors, then use an adjustable valve for optimal balance.

04-03-2015, 02:13 AM	#1
king-918 Registered User Join Date: Nov 2011 Location: Oklahoma City Oklahoma Posts: 1,056	Okay guys needs some brake help My 86 SWB has never had brakes since I owned it now I need a good aftermarket adjustable proportioning valve and hopefully a link on brake lines, thanks in advance __________________ <----Christopher My Tardis Oh yeah I'm really a Toyota guy, but had some stuff sitting around. Oklahoma

04-03-2015, 08:03 AM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: Okay guys needs some brake help Inline Tube for the lines, buy the stainless, NAPA for hoses, Raybestos or AC from FLPA or Rock Auto for calipers etc. Why do you need an adjustable valve? Did you go disc on the rear? Otherwise look at a stock set up. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

04-03-2015, 10:40 AM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Okay guys needs some brake help 4wheel disc conversions don't need an adjustable combination valve. Several options exist for drop-in fixed combination valves that are properly balanced for disc/disc systems. Here's one of them from Right Stuff. http://www.jegs.com/i/Right-Stuff/96...ductId=1502558 I assume you are installing a Master Cylinder/Power Assist biased for Disc/Disc systems... If you aren't changing at least the Master Cylinder to a Disc/Disc unit stick with the Disc/Drum combination valve. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-03-2015, 12:42 PM	#4
king-918 Registered User Join Date: Nov 2011 Location: Oklahoma City Oklahoma Posts: 1,056	Re: Okay guys needs some brake help Thanks for the reply. I do still have the stock booster and master but they can be replaced too. the truck and been converted to rear disk and the bed will constantly hold Atleast 300 lbs of extra weight. __________________ <----Christopher My Tardis Oh yeah I'm really a Toyota guy, but had some stuff sitting around. Oklahoma

04-03-2015, 01:03 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Okay guys needs some brake help If you don't want to convert the MC & Booster keep the factory combination valve & install an adjustable bias valve in the rear brake line. Wilwood, Tilton, Baer, etc make an inline rotary "Proportioning" valve to adjust the rear brake bias. I'd stay away from the adjustable combination valves. I will say this... Some of the bias is controlled by the piston sizes in the MC and rear calipers. I've converted two 1970's German Water Cooled A1 VW's to 4wheel disc brakes using late 1990's A3 VW rear disc components. I didn't change anything but the rear brake and stub axles. They didn't lock the rear wheels even in simulated panic stops. They did cut my braking distance down significantly. You may want to assemble the system, bleed it, and test drive very late at night in a large empty mall type parking lot or long dead-end commercial street. Bring a couple friends to help, take some tape measurements, put out some cheap cones, and write a bunch of stuff down. If your local LEO are not complete asshats and you are obviously serious they won't bother you. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-03-2015, 05:26 PM	#7
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,597	Re: Okay guys needs some brake help If your truck's tires are the same size front & rear, and you are using stock calipers and discs, with drums on the rear, then go ahead and use the factory type proportioning valve. If your rear tires are taller than the fronts, or if you have larger rotors, then use an adjustable valve for optimal balance. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 04-03-2015 at 05:34 PM.



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