help please about brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*big71* · 10-21-2002, 10:09 PM

a frend of my has a 1970 drum front and drum rear he does not want to change over to disk but he want to put a power booster on it what port valve does he need or all them the same i thought disk and drum port valve was diffen. if you can help thanks

*racedvl* · 10-21-2002, 11:21 PM

Disk and drum brakes use diffrent P-valves.

TERRYP · 10-22-2002, 05:15 AM

If you are going to use your old single outlet master, no valve is meeded. Dual master cylinders can be plumbed for cross or front/rear braking. Either way, no valve for all drums.

Fred T · 10-22-2002, 08:44 AM

If you get the master cylinder for a drum/drum setup you don't need a proportioning valve or cross-plumbing. My 69 has drum/drum power brakes with a dual master cylinder.

jmil1974 · 10-22-2002, 08:57 AM

Tell him to think about www.praisedyno.com for some shoes. That, with power, should make his braking very nice (on par with factory disc).

Longhorn Man · 10-23-2002, 12:18 AM

Never seen a single resivour master cylinder on these trucks...power/non power, drum or disc....they all had daul resivours as far as i know.

**68 Stepside** · 10-23-2002, 01:09 AM

I agree with longhornmail. My 66 3/4 ton had a single res; and my 67 C10 panel has a dual...

TJ

TERRYP · 10-23-2002, 05:00 AM

You're right about the single resevoirs only to '66. I was thinking about my panel when I wrote that, which I changed to dual with drums, then put 78 x-member in, with prop valve.

10-21-2002, 10:09 PM	#1
big71 Account Suspended Join Date: Nov 2001 Location: JONESVILL NC Posts: 1,303	help please about brakes a frend of my has a 1970 drum front and drum rear he does not want to change over to disk but he want to put a power booster on it what port valve does he need or all them the same i thought disk and drum port valve was diffen. if you can help thanks

10-22-2002, 05:15 AM	#3
TERRYP GYRO GEARLOOSE Join Date: Jun 2000 Location: Nevada City, CAEverett, WA Posts: 361	If you are going to use your old single outlet master, no valve is meeded. Dual master cylinders can be plumbed for cross or front/rear braking. Either way, no valve for all drums. __________________ Nevada City, CA Everett, Washington 57 3/4 rat, 235, 3spd 66 C-10 Panel, SWB. 350 from '68, 200R4 tranny, 3.07 rear ratio, restoring 68 C10 LWB 350 4spd, 4.56 rear dump runner 82 Camaro, 305, THM-200-R4 84 Monte Carlo 305 TH350, land tuna 85 Tercel SW, snow runner DISGRACED OUTLAW MEMBER OF THE DRUM BRAKE CLUB

10-22-2002, 08:44 AM	#4
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	If you get the master cylinder for a drum/drum setup you don't need a proportioning valve or cross-plumbing. My 69 has drum/drum power brakes with a dual master cylinder. __________________ Fred There is no such thing as too much cam...just not enough engine.

10-22-2002, 08:57 AM	#5
jmil1974 Ain't we cute? Join Date: May 2002 Location: Friendswood, TX Posts: 700	Tell him to think about www.praisedyno.com for some shoes. That, with power, should make his braking very nice (on par with factory disc). __________________ 69 C10 2WD LWB Fleet 350/350 power front disc conversion (6 lug disc kit from gmcpauls) and new engine, PS, A/C, fresh fluids, SHE DRIVES! FOR SALE $3900

10-23-2002, 01:09 AM	#7
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	I agree with longhornmail. My 66 3/4 ton had a single res; and my 67 C10 panel has a dual... TJ __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

10-21-2002, 11:21 PM	#2
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	Disk and drum brakes use diffrent P-valves.

10-23-2002, 12:18 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Never seen a single resivour master cylinder on these trucks...power/non power, drum or disc....they all had daul resivours as far as i know.

10-23-2002, 05:00 AM	#8
TERRYP GYRO GEARLOOSE Join Date: Jun 2000 Location: Nevada City, CAEverett, WA Posts: 361	You're right about the single resevoirs only to '66. I was thinking about my panel when I wrote that, which I changed to dual with drums, then put 78 x-member in, with prop valve. __________________ Nevada City, CA Everett, Washington 57 3/4 rat, 235, 3spd 66 C-10 Panel, SWB. 350 from '68, 200R4 tranny, 3.07 rear ratio, restoring 68 C10 LWB 350 4spd, 4.56 rear dump runner 82 Camaro, 305, THM-200-R4 84 Monte Carlo 305 TH350, land tuna 85 Tercel SW, snow runner DISGRACED OUTLAW MEMBER OF THE DRUM BRAKE CLUB



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