Brakes Went The Floor... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironangel** · 09-16-2012, 03:16 PM

Stopped at the pay window at Micky-D's and all of the sudden the pedal went to the floor and now all I have is rear brakes. Pedal's soft nearly all the way to the floor. Is it the Master Cylinder or Power Brake Booster? I've already purchased a new booster but when I removed the MC, there was brake fluid puddled between the MC and the booster. 72 C-10 with power disc brakes. New lines, cylinders, shoes & hardware. I havent noticed any leaks until I removes the MC. The brakes would fade sitting at a light or steady application...Just want some other opinions...Thanks in advance

~Michael Hill~

**Stocker** · 09-16-2012, 03:34 PM

Quote:

Originally Posted by Ironangel

brake fluid puddled between the MC and the booster.

Bad master cylinder

DesertCat · 09-16-2012, 03:36 PM

Sounds like the m/c, the fluid is a dead give away, but take a very close look at the front calipers, lines and PV as well.

Frkypunk70 · 09-16-2012, 06:17 PM

Had a brake line do that on my 71 chevelle once. Couldnt find the leak initially because it was running down the frame rail.
Posted via Mobile Device

**Ironangel** · 09-16-2012, 11:37 PM

Right on, Thanks for the replys. I'm picking up a new MC tomorrow. I had the truck in the shop earlier today messing with MC and decided to wait until tomorrow before I render it imobile for a couple of hours so I parked it in the yard and went on to do some mowing and catch a game. I get home this evening and I smell a very strong odor of gasoline! After a quick look see I realize the fuel pump is leaking! I know it wasnt leaking when it was in the shop this afternoon, I only drove it 100 feet and parked it! Guess it felt neglected!

09-16-2012, 03:16 PM	#1
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Brakes Went The Floor... Stopped at the pay window at Micky-D's and all of the sudden the pedal went to the floor and now all I have is rear brakes. Pedal's soft nearly all the way to the floor. Is it the Master Cylinder or Power Brake Booster? I've already purchased a new booster but when I removed the MC, there was brake fluid puddled between the MC and the booster. 72 C-10 with power disc brakes. New lines, cylinders, shoes & hardware. I havent noticed any leaks until I removes the MC. The brakes would fade sitting at a light or steady application...Just want some other opinions...Thanks in advance ~Michael Hill~ __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

09-16-2012, 03:36 PM	#3
DesertCat Registered User Join Date: Mar 2011 Location: Valley of the Sunstroke, Arizona Posts: 1,210	Re: Brakes Went The Floor... Sounds like the m/c, the fluid is a dead give away, but take a very close look at the front calipers, lines and PV as well. __________________ My build thread - Devastation and Reform http://67-72chevytrucks.com/vboard/s...d.php?t=567131

09-16-2012, 06:17 PM	#4
Frkypunk70 Registered User Join Date: Mar 2010 Location: Scranton,Pa Posts: 423	Re: Brakes Went The Floor... Had a brake line do that on my 71 chevelle once. Couldnt find the leak initially because it was running down the frame rail. Posted via Mobile Device __________________ "When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car. "

09-16-2012, 11:37 PM	#5
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Brakes Went The Floor... Right on, Thanks for the replys. I'm picking up a new MC tomorrow. I had the truck in the shop earlier today messing with MC and decided to wait until tomorrow before I render it imobile for a couple of hours so I parked it in the yard and went on to do some mowing and catch a game. I get home this evening and I smell a very strong odor of gasoline! After a quick look see I realize the fuel pump is leaking! I know it wasnt leaking when it was in the shop this afternoon, I only drove it 100 feet and parked it! Guess it felt neglected! __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

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