No Rear Brakes with lots of troubleshooting need help!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KFreddy · 03-18-2007, 09:53 PM

With disc all around you can ditch the combination valve but you will need to add and use a proporting valve for front/rear bias adjustment...

NPilot1975 · 03-19-2007, 10:10 AM

Is there a way tell if the MC is good without taking it off? I had the lid off, if the brakes were pumped there was a jet of fluid that would come up in each bowl (not out of the bowl but above the surface of the fluid.) I was told this is not good. I get fluid at all four corners, but the front discs work and the rear drums have nothing. I am assuming MC or Combo Valve????

JimKshortstep4x4 · 03-19-2007, 07:24 PM

I would suggest taking the line to the rear off of the prop valve and try bleeding it there first. If no fluid comes through it is the prop valve or the MC.
To eliminate the prop valveas a problem bleed the rear of the MC only.

All of the Master Cylinders that I have seen have the fluid stream up when depressing the brake pedal.

Sometimes bleeding the rear brakes can take forever so if the MC and prop valve check out, just keep bleeding the rear.

Jim

GREASEMONKEY72 · 03-19-2007, 07:42 PM

one another thing to think about is the wheel cylenders

goodluck

03-18-2007, 09:53 PM	#1
KFreddy Active Member Join Date: Apr 2005 Location: Miami, Florida Posts: 286	Re: No Rear Brakes with lots of troubleshooting need help!! With disc all around you can ditch the combination valve but you will need to add and use a proporting valve for front/rear bias adjustment...

03-19-2007, 10:10 AM	#2
NPilot1975 Senior Member Join Date: Aug 2002 Location: Plymouth, MA Posts: 891	Re: No Rear Brakes with lots of troubleshooting need help!! Is there a way tell if the MC is good without taking it off? I had the lid off, if the brakes were pumped there was a jet of fluid that would come up in each bowl (not out of the bowl but above the surface of the fluid.) I was told this is not good. I get fluid at all four corners, but the front discs work and the rear drums have nothing. I am assuming MC or Combo Valve???? __________________ 1972 Blazer body...need to get a thread started for the rest of the story Last edited by NPilot1975; 03-19-2007 at 10:14 AM.

03-19-2007, 07:24 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: No Rear Brakes with lots of troubleshooting need help!! I would suggest taking the line to the rear off of the prop valve and try bleeding it there first. If no fluid comes through it is the prop valve or the MC. To eliminate the prop valveas a problem bleed the rear of the MC only. All of the Master Cylinders that I have seen have the fluid stream up when depressing the brake pedal. Sometimes bleeding the rear brakes can take forever so if the MC and prop valve check out, just keep bleeding the rear. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

03-19-2007, 07:42 PM	#4
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: No Rear Brakes with lots of troubleshooting need help!! one another thing to think about is the wheel cylenders goodluck __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME



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