brake bleeding issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shelby987 · 11-17-2005, 11:03 AM

this is not for one of our trucks, but I am sure it should apply....I had to replace the rear wheel cylinders on my 93 oldsmobile....and for some reason I can't seem to get pedal feel back to where it should be. I replaced the rear wheel cylinders, the front rotors, and pads and shoes on all four corners.....I have bleed the system started at the rr, lr, fr, and the fl corners of the car....and the pedal still goes almost all the way to the floor.....any suggestions?
I wasn't sure if I needed to bleed the fronts, but after just bleeding the rears, the pedal was on the floor, so I went back and did all four corners.
The problem, when the car is off, the pedal feels firm after initial bleeding.....when I start the car....i get one or two good firm steps on the brakes.....then its right to the floor......best and brightest.....help would be appreciated!

**truckdude239** · 11-17-2005, 11:15 PM

umm sounds like an bad master cylider

LUV2XCLR8 · 11-17-2005, 11:48 PM

Quote:

Originally Posted by truckdude239

umm sounds like an bad master cylider

My thoughts exactly, sorry

shelby987 · 11-18-2005, 08:28 AM

Is it possible that the master cylinder would just go bad without any symptoms? Short of being caused by adding fluid while bleeding the brakes.....what are the odds it would just break during a brake replacement?

**Palf70Step** · 11-18-2005, 08:33 AM

Does the car have Antilock breaks. I know my GMC, I couldn't ever get it to bleed right becuase of that. They say it requires something special from the dealer.

shelby987 · 11-18-2005, 08:46 AM

no abs.....it doesn't even have overdrive......very plain......and yes, I have bleed brakes before

**truckdude239** · 11-18-2005, 09:52 AM

yes they can when you are bleeding the brakes you can "overstroke" the master cylider which baslicy mean that when your bleeding you push the cups in the master cylider farer then they normally do and ppast where they normally stop is gunk and rust which will eat up the cups. its not uncomen to blow it mc while bleeding. they say to bench bleed the new mc but i install it in the car if possible fill it with fuild but the bleed kit on it and have someone out side watching for bubbles while i slowly push the brake pedel

11-17-2005, 11:03 AM	#1
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	brake bleeding issues this is not for one of our trucks, but I am sure it should apply....I had to replace the rear wheel cylinders on my 93 oldsmobile....and for some reason I can't seem to get pedal feel back to where it should be. I replaced the rear wheel cylinders, the front rotors, and pads and shoes on all four corners.....I have bleed the system started at the rr, lr, fr, and the fl corners of the car....and the pedal still goes almost all the way to the floor.....any suggestions? I wasn't sure if I needed to bleed the fronts, but after just bleeding the rears, the pedal was on the floor, so I went back and did all four corners. The problem, when the car is off, the pedal feels firm after initial bleeding.....when I start the car....i get one or two good firm steps on the brakes.....then its right to the floor......best and brightest.....help would be appreciated! Last edited by shelby987; 11-17-2005 at 11:03 AM.

11-17-2005, 11:15 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: brake bleeding issues umm sounds like an bad master cylider __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

11-18-2005, 08:28 AM	#4
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	Re: brake bleeding issues Is it possible that the master cylinder would just go bad without any symptoms? Short of being caused by adding fluid while bleeding the brakes.....what are the odds it would just break during a brake replacement? __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!

11-18-2005, 08:33 AM	#5
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: brake bleeding issues Does the car have Antilock breaks. I know my GMC, I couldn't ever get it to bleed right becuase of that. They say it requires something special from the dealer. __________________ 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!

11-18-2005, 08:46 AM	#6
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	Re: brake bleeding issues no abs.....it doesn't even have overdrive......very plain......and yes, I have bleed brakes before __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!

11-18-2005, 09:52 AM	#7
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: brake bleeding issues yes they can when you are bleeding the brakes you can "overstroke" the master cylider which baslicy mean that when your bleeding you push the cups in the master cylider farer then they normally do and ppast where they normally stop is gunk and rust which will eat up the cups. its not uncomen to blow it mc while bleeding. they say to bench bleed the new mc but i install it in the car if possible fill it with fuild but the bleed kit on it and have someone out side watching for bubbles while i slowly push the brake pedel __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

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