Brakes, front/rear balance problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tomme · 08-25-2005, 04:36 PM

Hi!

I have problems with the front rear brake balance on my 1970 C20 with stock power drums, rear brakes locks before front.

I have adjusted the brake shoes as good as i can, but the problems stays.
The rear brakes locks easily on asphalt but not the front, although the shoes are new and the wheel cylinders seems to work ok.

I am now suspecting an internal leakage in the master cylinder.
I have not found a new master cylinder here in Sweden, so i have just replaced the gaskets in the old cylinder, there where some marks that was not possible to hone away, so i will possibly still have some problems.

One thing that came to my mind is the routing of the brake lines, if it matters wich outlet on the cylinder the lines for front and rear are connected to.

On my car the lines to the front brakes are connected to the front port of the cylinder, and the rear brakes to the rear port.

Can this possibly be wrong?
Does it really matter on an all-drums car?

I have contact with a guy who claims to have disc brake spindles from a -72 C20 with 8 bolts, so i might consider a swap on my truck.

Any comments on possible causes to my balance problems are much welcome.

Regards
Tomme

dwcsr · 08-25-2005, 07:13 PM

yes it does make a difference where the lines go on the master. I don't know on your model where they go, maybe some one here has the same truck and can tell you. But it sounds like you have them backwards.

squizzleboy · 08-25-2005, 09:07 PM

Yes just swap the lines. It puts more power to the front than the back.

**JIMs70GMC** · 08-25-2005, 09:58 PM

both mine are front to rear and rear to front if you know what I mean, swap them.

Tomme · 08-26-2005, 02:31 AM

Seems like iv'e got some line swapping to do.

Thanks all for your replies!

I'll be back with the result...

08-25-2005, 04:36 PM	#1
Tomme Registered User Join Date: Jul 2005 Location: Uppsala-Sweden Posts: 31	Brakes, front/rear balance problem Hi! I have problems with the front rear brake balance on my 1970 C20 with stock power drums, rear brakes locks before front. I have adjusted the brake shoes as good as i can, but the problems stays. The rear brakes locks easily on asphalt but not the front, although the shoes are new and the wheel cylinders seems to work ok. I am now suspecting an internal leakage in the master cylinder. I have not found a new master cylinder here in Sweden, so i have just replaced the gaskets in the old cylinder, there where some marks that was not possible to hone away, so i will possibly still have some problems. One thing that came to my mind is the routing of the brake lines, if it matters wich outlet on the cylinder the lines for front and rear are connected to. On my car the lines to the front brakes are connected to the front port of the cylinder, and the rear brakes to the rear port. Can this possibly be wrong? Does it really matter on an all-drums car? I have contact with a guy who claims to have disc brake spindles from a -72 C20 with 8 bolts, so i might consider a swap on my truck. Any comments on possible causes to my balance problems are much welcome. Regards Tomme __________________ 1966 Impala 2D HT 1940 1/2 ton Truck

08-25-2005, 09:07 PM	#3
squizzleboy Registered User Join Date: Jun 2005 Location: california Posts: 111	Yes just swap the lines. It puts more power to the front than the back. __________________ 63 chevy 350 crate th350 silverado seats american autowire harness

08-25-2005, 09:58 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	both mine are front to rear and rear to front if you know what I mean, swap them. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-26-2005, 02:31 AM	#5
Tomme Registered User Join Date: Jul 2005 Location: Uppsala-Sweden Posts: 31	Seems like iv'e got some line swapping to do. Thanks all for your replies! I'll be back with the result... __________________ 1966 Impala 2D HT 1940 1/2 ton Truck

08-25-2005, 07:13 PM	#2
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	yes it does make a difference where the lines go on the master. I don't know on your model where they go, maybe some one here has the same truck and can tell you. But it sounds like you have them backwards.



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