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Brake peddle goes to floor after starting vehicle

Tiny
CARPETMAN1759
  • MEMBER
  • 2002 CHEVROLET S-10
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 117,000 MILES
No brakes! Rusted out brake line to rear brakes at frame near exhaust manifold. Replaced with 12 inch flared tubing which is working great with no leaks. Installed a new master cylinder and bled the brakes. Great brake peddle until you start the truck and the peddle goes to the floor. Brakes were working fine until the hole in the line happened. Rotors, pads and calibers are a month old. What am I missing?
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Friday, July 29th, 2016 AT 5:31 PM

14 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Maybe it's your bleeding technique?

Here is the way I was brought up!

See this link

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

The Medic
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
CARPETMAN1759
  • MEMBER
  • 81 POSTS
Used three different ways to bleed them. The gravity, two man pump and release the screws and used a vacuum pump. Gone through each method three times with no change. There cannot be that much air in the ABS system can there?
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
At times, yes. Especially if you are not closing the bleeder screws properly.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
CARPETMAN1759
  • MEMBER
  • 81 POSTS
Been shade tree mechanic for forty years. I think I should be able to close bleeders properly by now. What ever the problem is I know it has to be something stupid.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Here is the bleed sequence as per Mitchel 1let me know how you get on.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
CARPETMAN1759
  • MEMBER
  • 81 POSTS
I have this same write-up in one of my books. Have done this three times today and have great peddle after it is done, but when I start the engine the peddle just hits the floor when you push on the peddle. Thanks for your time!
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I went through this with a Suburban with ABS you can try and try to bleed the brakes did not happen. What you do is bleed the brakes like normal. Then you use the automated bleed procedure with a professional high end expensive scan tool. What they have you do is hold the the brake pedal while running the automated bleed procedure with the scan. Sometimes you have to do it more then once. It runs the ABS system to help purge the air out of it.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
CARPETMAN1759
  • MEMBER
  • 81 POSTS
I was thinking my truck was to old to have that type of ABS. My truck is a 2002. The problem is I cannot drive it to the garage the way it is. I guess I could cut holes in the floor and use my shoes.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I have had pre-2000 vehicles requiring a scan tool to bleed the brakes. I wish there was a go around before I got my professional scan tool that did stuff like that. I had to turn away work because of it.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
CARPETMAN1759
  • MEMBER
  • 81 POSTS
Thanks for the info! I guess I will find a way to get it to the shop.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You have tried your best to do it without it a scan tool. Unfortunately there are a lot of repair situations that require special tools. I wish it was not like that.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
CARPETMAN1759
  • MEMBER
  • 81 POSTS
WELL, Got it done! It took me a while. Did not need NO scanner tool, This truck is to old for that method. Just spent the day bleeding and got the air out. Thanks to everyone that replied.
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Glad we could help. Please use 2CarPros anytime
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Thursday, August 27th, 2020 AT 6:27 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I was going by the repair information I had with abs had a 2005 suburban same bleeding procedure couldn't be bleed till using the scan tool. Glad to hear you got it.
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Thursday, August 27th, 2020 AT 6:27 PM

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