Question on rear Disc brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**idbeast** · 05-16-2018, 03:07 PM

Question on rear Disc brakes, are you running 3/16" line all the way back from the master cylinder/ proportioning valve, or are you running 1/4" from the master cylinder/ proportioning valve back to the rear shock cross member and teeing to 3/16" lines.

1project2many · 05-16-2018, 06:00 PM

The size of the tubing should be based on the volume of fluid needed for the caliper. If the calipers are single piston you can often get away with 3/16" all the way back. For multiple piston calipers it's more important to use larger line.

PDW HOTRODS · 05-16-2018, 06:24 PM

It wouldn't hurt hurt to go 1/4. If it's a little bigger than you need, not a problem. The rubber lines from the axle to the calipers will be the size needed for the calipers and will restrict any extra.

1project2many · 05-16-2018, 09:48 PM

Also, if you install 1/4" line now you're covered if for some reason you decide to go with larger brakes later.

**idbeast** · 05-16-2018, 11:40 PM

I'm using the Single piston rear calipers from the 79-85 Eldorado, Toronado, Riviera.

_Ogre · 05-18-2018, 12:13 PM

my whole system is plumbed in 3/16" as recommended by inline tube for 4 wheel discs

**mr48chev** · 05-18-2018, 08:02 PM

Best bet would be to figure out what the size of the brake lines to the rear of the Cad the calipers were intended for are and go from there.

05-16-2018, 03:07 PM	#1
idbeast Senior Member Join Date: Oct 2016 Location: Olympia, WA Posts: 523	Question on rear Disc brakes Question on rear Disc brakes, are you running 3/16" line all the way back from the master cylinder/ proportioning valve, or are you running 1/4" from the master cylinder/ proportioning valve back to the rear shock cross member and teeing to 3/16" lines.

05-16-2018, 06:00 PM	#2
1project2many Registered User Join Date: Mar 2012 Location: Lakes Region NH Posts: 3,200	Re: Question on rear Disc brakes The size of the tubing should be based on the volume of fluid needed for the caliper. If the calipers are single piston you can often get away with 3/16" all the way back. For multiple piston calipers it's more important to use larger line.

05-16-2018, 06:24 PM	#3
PDW HOTRODS Registered User Join Date: Nov 2006 Location: Sutherlin Oregon Posts: 502	Re: Question on rear Disc brakes It wouldn't hurt hurt to go 1/4. If it's a little bigger than you need, not a problem. The rubber lines from the axle to the calipers will be the size needed for the calipers and will restrict any extra.

05-16-2018, 09:48 PM	#4
1project2many Registered User Join Date: Mar 2012 Location: Lakes Region NH Posts: 3,200	Re: Question on rear Disc brakes Also, if you install 1/4" line now you're covered if for some reason you decide to go with larger brakes later.

05-16-2018, 11:40 PM	#5
idbeast Senior Member Join Date: Oct 2016 Location: Olympia, WA Posts: 523	Re: Question on rear Disc brakes I'm using the Single piston rear calipers from the 79-85 Eldorado, Toronado, Riviera.

05-18-2018, 12:13 PM	#6
_Ogre Registered User Join Date: Jan 2012 Location: Motown Posts: 7,680	Re: Question on rear Disc brakes my whole system is plumbed in 3/16" as recommended by inline tube for 4 wheel discs __________________ cool, an ogre smiley Ogre's 58 Truk build how to put your truck year and build thread into your signature shop air compressor timer

05-18-2018, 08:02 PM	#7
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,709	Re: Question on rear Disc brakes Best bet would be to figure out what the size of the brake lines to the rear of the Cad the calipers were intended for are and go from there. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.



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