Bleeding Master cylinder on car - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Bleeding Master cylinder on car

Reply
 
 
 
Thread Tools Search this Thread
Old 02-17-2008, 07:04 PM   #1
wolfsdad
Junior Member
Thread Starter
 
wolfsdad's Avatar
 
Member Since: Jan 2006
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
Default Bleeding Master cylinder on car

Am about to replace the 2 lines that feed down from the master cylinder as they got damaged by a falling block and tackle from an overhead hoist Luckily, this seems to be the only damage.

I have read posts before about bench bleeding new master cylinders before putting them on the car. I wondered if before the new lines are fitted, I could simply refill cylinder ( fluid was lost ) and bleed it using two small pipes that feed back into it by slowly pressing the brake pedal and then refit new lines.
Thanks.
wolfsdad is offline   Reply With Quote
Old 02-17-2008, 07:36 PM   #2
Durango_Boy
CF Senior Member
 
Durango_Boy's Avatar
 
Member Since: Aug 2006
Location: Columbia Missouri
Posts: 24,128
Thanks: 0
Thanked 1 Time in 1 Post
Default

It's best to bench bleed it, and then bleed again after it's in the car.
Durango_Boy is offline   Reply With Quote
Old 02-17-2008, 08:28 PM   #3
Merlinhaggard
CF Senior Member
 
Merlinhaggard's Avatar
 
Member Since: Jan 2007
Posts: 589
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by wolfsdad View Post
Am about to replace the 2 lines that feed down from the master cylinder as they got damaged by a falling block and tackle from an overhead hoist Luckily, this seems to be the only damage.

I have read posts before about bench bleeding new master cylinders before putting them on the car. I wondered if before the new lines are fitted, I could simply refill cylinder ( fluid was lost ) and bleed it using two small pipes that feed back into it by slowly pressing the brake pedal and then refit new lines.
Thanks.
Yes. You can... cut the lines short, like a couple inches and put some hose on them and run back into the cyl. Pump it until theres no bubbles.. same difference..
I would have the new lines in before removing the old ones and hook the new ones up immediatly making sure theres plenty of fluid in the resivoir. Be sure to keep plenty of fluid in there while the new lines are filling up. You can gravity bleed them and they will use fluid quick. Watch it. If it emptys you have to start over..
Merlinhaggard is offline   Reply With Quote
Old 02-17-2008, 08:47 PM   #4
'75
CF Senior Member
 
'75's Avatar
 
Member Since: Dec 2007
Location: McHenry Illinois
Posts: 4,706
Thanked 101 Times in 98 Posts
Default

One of the reasons for bench bleeding is that you can get the master cylinder sitting level. On the car the front is usually elevated. You could jack up the rear of the car enough to get the master cylinder sitting level before the bleeding, but if you're going to that much trouble, the mc is not that hard to remove.
'75 is offline   Reply With Quote
Old 02-17-2008, 11:00 PM   #5
ZD75blue
CF Senior Member
 
ZD75blue's Avatar
 
Member Since: Nov 2000
Location: NC,USA
Posts: 16,417
Thanks: 0
Thanked 0 Times in 0 Posts
Default

You can do it with the lines on the car if the rest of the lines are mostly filled with fluid. Slide some vacuum line over the new lines and fill them up with fluid. Then hook up to the master cylinder and get most of the air out of the four corners.

Crack the lines loose at the master cylinder and run them like they are bleeders. Gotta wrap rags around the lines in the car and put a pan under the master cylinder... some drip will find paint. Hold pressure, crack the lines loose fluid and air will bubble out of the threads. When it is just fluid, go bleed at each corner again.

Its easy enough to do, but if you can bleed it on the bench do it as its a lot easier. The above works if you don't have some spare lines. (I figured out how to do it on a master that had a remote resevoir and I had nothing that fit the ports! )
ZD75blue is offline   Reply With Quote
Old 02-18-2008, 09:55 AM   #6
Jud Chapin
CF Senior Member
Support Corvetteforum!
St. Jude Donor '11-'12-'13-'14-'15-'16
 
Jud Chapin's Avatar
 
Member Since: Sep 2001
Location: Wellington Florida
Posts: 6,117
Thanked 31 Times in 29 Posts
Default

Yes, the M/C must be level while bleeding. That is why they tell you to "bench" bleed it. I wouldn't try it any other way as you are asking for trouble. If you frequent this forum often, I'm sure you have seen many posts where members are having mucho trouble bleeding their brakes.
Jud Chapin is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Bleeding Master cylinder on car
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Pressure bleeding master cylinder? Meta C5 Tech 5 06-24-2014 02:05 PM
    Installing 1967 Master Brake Cylinder Old Shep C1 & C2 Corvettes 12 06-07-2013 09:20 PM
    Brakes? I have none. 1990 Corvette Rogman C4 Tech/Performance 16 11-11-2012 11:27 PM
    Brake Master Cylinder Bleed? Vette Dog C5 Tech 6 10-28-2009 03:19 PM
    How to bench bleed new master cylinder? Rich's94vert C4 Tech/Performance 4 04-12-2002 02:23 PM


    Tags
    bleed, bleeding, brake, c3, c5, c5corvettebleedmastercylinder, c6, car, corvette, cracking, cylinder, cylneder, master, pressure, vehicle

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 09:44 AM.