Any tips on bleeding MII brakes?
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Senior User
Joined: Jun 2002
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From: San Jose, CA USA
Any tips on bleeding MII brakes?
IM AT MY WITS END! Did a search, no luck. Any tips on bleeding Mustang II brakes? It's an MII power brake unit , and it is giving my stress levels run for it's money. 4 attempts and much 
in 24 hours have done nothing for my Blood pressure. Any tips appreciated. I don't want to resort to Flintstone braking system!
in 24 hours have done nothing for my Blood pressure. Any tips appreciated. I don't want to resort to Flintstone braking system!
old and in the way
Joined: Jul 1997
Posts: 5,921
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From: Lovely Hueytown Alabama
Any tips on bleeding MII brakes?
Renee ???
more details... what is the problem ? typically you bleed the master cylinder into itself... hook up the lines and bleed the longest line first then shorter down to the shortest .
tell us what your problem is... spongy pedal, low pedal, no pedal ????
john
more details... what is the problem ? typically you bleed the master cylinder into itself... hook up the lines and bleed the longest line first then shorter down to the shortest .
tell us what your problem is... spongy pedal, low pedal, no pedal ????
john
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Senior User
Joined: Jun 2002
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From: San Jose, CA USA
Any tips on bleeding MII brakes?
Followed all those steps....we bled all the air out of the lines, and just when we think we got it, (resistance is felt behind pedal)...we fire up the engine to test it out and the pedal goes all the way to the floor to stop it! Could there be air left in there? What are we missing? HTH. I just keep hearing from fellow members of local truck club that MII are a PITA to bleed, but none have any tips to offer. They gave up and have theirs done by "brake guy". Thanks in advance!
Last edited by Keahi73; Aug 2, 2003 at 12:12 PM.
Postmaster
Joined: Mar 2000
Posts: 3,730
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From: Waynesville, OH
Any tips on bleeding MII brakes?
Renee, when you went back to bleed the brakes the second (and third, and fourth, etc.) time, did you get any air with the fluid? If so, then you aren't getting all the air out when you get some pedal pressure even though it might seem like it. So long as there isn't any more air getting into the system (low brake reservoir during bleeding, etc.), you'll eventually get all the air out if you keep removing some each time you bleed it.
Have you tried bleeding them with the engine running so the booster is on line? I never have tried that on any of my cars and I don't know if there would be a problem doing it that way.
Have you tried bleeding them with the engine running so the booster is on line? I never have tried that on any of my cars and I don't know if there would be a problem doing it that way.
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Joined: Jun 2002
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From: San Jose, CA USA
Any tips on bleeding MII brakes?
Ok, sessions 5 & 6. Bled the brakes til there wasn't ANY air. Made sure to keep an eye on the resevoir as well.session6 we tried with the engine running.
Truck will stop, but pedal still sinks to the floor. I think we're overlooking something. I think I will wait until this evening for more attempts. Perhaps call a "fresh" brain/body into the picture.(One who hasn't been messing with them all day!)
Truck will stop, but pedal still sinks to the floor. I think we're overlooking something. I think I will wait until this evening for more attempts. Perhaps call a "fresh" brain/body into the picture.(One who hasn't been messing with them all day!)
Lead Driver
Joined: Oct 1999
Posts: 6,776
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From: Kalispell, MT
Any tips on bleeding MII brakes?
Maybe I missed it, but what is the condition of your master cylinder? If it's rusted or pitted or have a blown seal you won't be able to keep the pedal up when running.
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Senior User
Joined: Jun 2002
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From: San Jose, CA USA
Any tips on bleeding MII brakes?
Master cyl, is new/rebuilt. I just sent hubby to the parts store for a new one. Have had a bad one "fresh" from the store before, and in my infinite tired wisdom, forgot all about that way back in bleeding session 2! LOL!
Will make sure and check the seal this time though! Here's to success....
Will make sure and check the seal this time though! Here's to success....
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Joined: Aug 2001
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From: Elwood, Ne 68937
Any tips on bleeding MII brakes?
I'm having the same problem that you are having. Did you get it to work, if so what did you do.
Thanks
Thanks
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Senior User
Joined: May 2002
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From: Fremont, CA
Any tips on bleeding MII brakes?
Hey Renee, I thought you guys fixed that problem. I really think you guys have a fitting somewhere thats letting air in. Are the cylinders good in the rear? The way to bleed them is pump the pedal 3-4 times and hold it, while holding the pedal have the other person open the bleeder screw until only fluid comes out, tighten the screw and then release the pedal. then move to the next wheel
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From: San Jose, CA USA
Any tips on bleeding MII brakes?
Yes Paul, we fixed the problem. I don't know what did it. Bench bleeding the M/C first or the umteenth bleeding of the brake lines!
Here is some advice on MII brake bleeding I got from an MII forum.
Here is some advice on MII brake bleeding I got from an MII forum.
First you have to bench bleed the master cylinder before it is installed in the truck. If you are not sure how to do this it goes like this:
install master cylinder in a bench vise
fill master cylinder to the top with new clean brake fluid
using a screw driver or punch, depress shaft of master cylinder about 3/4's of a stroke
oh I forgot, install a master cylinder bleeder hose kit before you start
repeat the bleeding procedure until there are no bubbles that are visable through the bleeder hose kit,
install master cylinder
start with the wheel that is furtherest away Right Rear
then do Left Front followed by Left Rear and then Right Front
I use a simple one man system to bleed brakes
use a old oil container or brake fuild container. Drill a hole in the cap large enough for a 5/16th vacuum line to pass through it
Have the length long enough to attach to the bleeder and rest on the floor
Poor a little bit of brake fluid into the container and make sure that the vacuum line sits at the bottom
Crack the bleeder screw
Slowly pump brake fluid about 20 times only going half way down to floor.
Double check master cyl brake fluid level
tighten bleeder and proceed to the next wheel and repeat the steps
Double check the fluid level and bleeder screws
Make sure that if your using drum rear brakes that they are adjusted properly too. This should of been done before you started bleeding. Sorry just thought of it.
That should do it
Good Luck
__________________
Frank Andricciola
install master cylinder in a bench vise
fill master cylinder to the top with new clean brake fluid
using a screw driver or punch, depress shaft of master cylinder about 3/4's of a stroke
oh I forgot, install a master cylinder bleeder hose kit before you start
repeat the bleeding procedure until there are no bubbles that are visable through the bleeder hose kit,
install master cylinder
start with the wheel that is furtherest away Right Rear
then do Left Front followed by Left Rear and then Right Front
I use a simple one man system to bleed brakes
use a old oil container or brake fuild container. Drill a hole in the cap large enough for a 5/16th vacuum line to pass through it
Have the length long enough to attach to the bleeder and rest on the floor
Poor a little bit of brake fluid into the container and make sure that the vacuum line sits at the bottom
Crack the bleeder screw
Slowly pump brake fluid about 20 times only going half way down to floor.
Double check master cyl brake fluid level
tighten bleeder and proceed to the next wheel and repeat the steps
Double check the fluid level and bleeder screws
Make sure that if your using drum rear brakes that they are adjusted properly too. This should of been done before you started bleeding. Sorry just thought of it.
That should do it
Good Luck
__________________
Frank Andricciola