No fluid to rear brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72K10 · 03-07-2005, 11:25 PM

Had soggy brakes, so replaced master cylinder. Went to bleed brakes, and the bleeder broke off. Replaced both rear wheel cylinders. Then the brake line blew out between master cylinder and rear. Replaced it as well. Went to bleed brakes, again, and nothing comes out of the rear bleeders. What's up with that? Any clues?

Chris

Longhorn Man · 03-07-2005, 11:28 PM

May have to bench bleed the master cylinder again.

Cat Fuzz · 03-08-2005, 01:33 AM

Prolly got some crud in the M/C.

**Palf70Step** · 03-08-2005, 06:35 AM

Your proportioning valve may be stuck or bad. Bench bleed the master cylinderand make sure it flows. Then checl the output from the proportioning valve to the rear. If you have fluid there and not the rear, then you have a bad line somewhere. My 82's proportioning valve was bad and it did what your's was doing....and i drove me nuts since I never had seen one fail before that.

**guyryan100** · 03-08-2005, 09:31 PM

I read here before (and had success with) a suggestion of stomping the crap out of the pedal in order to cause the proportioning valve to open up the rear. As I understood it, the proportioning valve may have closed off the rear if you ran dry on fluid in that chamber, but a good hard series of stomps would open it back up and get your fluid flowing.

Can someone confirm this?

**guyryan100** · 03-09-2005, 11:16 AM

Anybody?

**COBALT** · 03-09-2005, 11:20 AM

I can't confirm that, but I know what happens when you don't have good fluid pressure to the rear brakes....you blow a front wheel cylinder and loose your brakes entirely.

:\

03-07-2005, 11:25 PM	#1
72K10 Registered User Join Date: Dec 1999 Location: New York Posts: 288	No fluid to rear brakes Had soggy brakes, so replaced master cylinder. Went to bleed brakes, and the bleeder broke off. Replaced both rear wheel cylinders. Then the brake line blew out between master cylinder and rear. Replaced it as well. Went to bleed brakes, again, and nothing comes out of the rear bleeders. What's up with that? Any clues? Chris __________________ RLTW 70C10 72K10 72K10 Cheyenne 72C10 Cheyenne Super

03-08-2005, 01:33 AM	#3
Cat Fuzz My son, my joy. Join Date: Sep 2003 Location: Spokane WA Posts: 463	Prolly got some crud in the M/C. __________________ '69 Chevy 3/4 ton, 327cid, Carter AFB, Edelbrock intake, HEI, TH400. Founding member of the No Money To Spend On My Truck Club. When your at Home Depot, you WISH you had gotten an 8 foot bed!

03-08-2005, 06:35 AM	#4
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,083	Your proportioning valve may be stuck or bad. Bench bleed the master cylinderand make sure it flows. Then checl the output from the proportioning valve to the rear. If you have fluid there and not the rear, then you have a bad line somewhere. My 82's proportioning valve was bad and it did what your's was doing....and i drove me nuts since I never had seen one fail before that. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-09-2005, 11:20 AM	#7
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	I can't confirm that, but I know what happens when you don't have good fluid pressure to the rear brakes....you blow a front wheel cylinder and loose your brakes entirely. :\ __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

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03-07-2005, 11:28 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	May have to bench bleed the master cylinder again.

03-08-2005, 09:31 PM	#5
guyryan100 Registered User Join Date: Sep 2001 Location: Cumming, GA Posts: 481	I read here before (and had success with) a suggestion of stomping the crap out of the pedal in order to cause the proportioning valve to open up the rear. As I understood it, the proportioning valve may have closed off the rear if you ran dry on fluid in that chamber, but a good hard series of stomps would open it back up and get your fluid flowing. Can someone confirm this?

03-09-2005, 11:16 AM	#6
guyryan100 Registered User Join Date: Sep 2001 Location: Cumming, GA Posts: 481	Anybody?



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