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Bleeding brakes

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Graeme Toft

Joined: 09 Jan 2006
Posts: 123

Posted: Sat Mar 17, 2007 2:28 am Post subject: Bleeding brakes

Hi guys, can someone tell me what the best was is  to bleed matco brakes. For some reason I have two different types. The pilot  side has the 2 x MC-1 and the starboard side has 2 x MC-3.  

 Regards

Graeme 

   [quote][b]

d(at)cfisher.com
Guest

Posted: Sat Mar 17, 2007 2:42 am Post subject: Bleeding brakes

Graeme,  I have not done dual system like that  but if it plumbed lilke this  http://matco.elixirlabs.com/users/matco/images/mastercylinder21a.jpg

 I would do it as a single systems  below.

 http://matco.elixirlabs.com/users/matco/images/PRESS_BLEED.jpg

 Looks like the reserviors are on the    left side .  

  

 Dave

  

  

 [quote]   ---

7suds(at)Chartermi.net
Guest

Posted: Sat Mar 17, 2007 5:19 am Post subject: Bleeding brakes

Graeme,

 Do not know if it is the best but it worked very well for me.  I used a 12 volt fuel pump, hooked it to a gal jug with brake fluid in it and  the other end to the bleeder on the brake. I also had the top plug of the  brake fluid reservoir replaced with a hose barb and hose that went  back to the gal jug. I would bump the fuel pump on and off while I worked the  brake until there were no more air bubbles in the line. (Leaving the fuel pump  I was using "on" all the time would pop the line off the  brake bleader, a smaller pressure pump would have been better but it was what I  had). Then do the same on the other side. My Matcos would weep at the seals and  I would have to re-bleed them every couple months or they would get  squishy.

 Lloyd

  

 [quote]   ---

kitfox69(at)earthlink.net
Guest

Posted: Sat Mar 17, 2007 6:57 am Post subject: Bleeding brakes

A trick I learned, while I was on the Maintinance Committee for my Flying club, was to run a piece of clear plastic oxygen hose from the bleeder at the brake, and back to the filler on the resiuvoir (sp). Just pump the brake pedal and the air will exit the end of the hose, while the fluid returns to the tank. Simple and works like a charm. Oh, and don't use the hose for your oxygen after bleeding your brakes. He! He!.

  

  

 Floyd Johnson

 kitfox69(at)earthlink.net (kitfox69(at)earthlink.net)

 EarthLink Revolves Around You.

  

 

   [quote][b]

lcfitt(at)sbcglobal.net
Guest

Posted: Sat Mar 17, 2007 11:04 am Post subject: Bleeding brakes

Graeme,  the way it was recommended to me as I was building is to use a 

lever type pump oil  can, fill it with the brake fluid and using a short 

length of plastic tubing connect it to the bleed fittings on the caliper and 

pump away.  Monitor the reservoirs.



Lowell



---

d(at)cfisher.com
Guest

Posted: Sat Mar 17, 2007 11:30 am Post subject: Bleeding brakes

Lowell,

Yup same here and if his setup is the same as the pic I sent earlier then 

that explains why they are different from left to right.  The one side would 

have the reservoir in it and the other it just flows through as you pump the 

fluid through.



One should add that MIL SPEC fluid only should be used.



Dave

---

d(at)cfisher.com
Guest

Posted: Sat Mar 17, 2007 11:32 am Post subject: Bleeding brakes

Floyd,  That might work on a application with the  bleeders pointed up but with the bleeder at the bottom of caliper I think you  woudl find it  hard to get all the air out.

  

 Air in system equals a spongy pedal. 

  

 Dave 

  

  

 [quote]   ---

lcfitt(at)sbcglobal.net
Guest

Posted: Sat Mar 17, 2007 1:52 pm Post subject: Bleeding brakes

Dave,  I don't understand the logic here.  If the bleeders are on the 

bottom, attach the tube, crack the bleeder then pump.  All the air will be 

expelled. Explain where the residual air will be found.



Lowell



---

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sat Mar 17, 2007 3:01 pm Post subject: Bleeding brakes

I start, surprisingly, by  draining my brake system down enough to be sure there will be no bubbles in the  brake lines or master cylinder.  Then I use a $1.95 pumper style oil can  with a bit of clear tubing pushed on over the end and put the other end on the  bleeding nipple.  I use the small pump in the oil can to drive fluid into  the wheel cylinder and back through the system.  Takes around a can full  (~3 oz.) of fluid to fill the brake system. 

  

 You know when it is done by  closing the bleeder and having a good solid brake.  Just incase I put  too much fluid in the system I wrap the base of master cylinder/ reservoir with  a rag.  Three times out of four I don't need it.  Using a barb  nipple in the top of the reservoir to create a closed loop as far as I can see  will cause a bit more mess but never the less is  interesting.

  

  

 

Noel [quote]   

   --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

dwight purdy

Joined: 10 Feb 2006
Posts: 85

Posted: Sat Mar 17, 2007 3:36 pm Post subject: Bleeding brakes

That sounds great!



           Dwight Purdy model ll



 



 At 10:57 AM 3/17/2007 -0400, you wrote:



  	  Quote: 	
		  A trick I learned, while I was on the Maintinance Committee for my Flying club, was to run a piece of clear plastic oxygen hose from the bleeder at the brake, and back to the filler on the resiuvoir (sp). Just pump the brake pedal and the air will exit the end of the hose, while the fluid returns to the tank. Simple and works like a charm. Oh, and don't use the hose for your oxygen after bleeding your brakes. He! He!.

  

  

 Floyd Johnson

 kitfox69(at)earthlink.net (kitfox69(at)earthlink.net)

 EarthLink Revolves Around You.

  



 

  	  Quote: 	
		  



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[/b] 	




 3/17/2007 12:33 PM

_________________
dwight
model II

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sat Mar 17, 2007 4:12 pm Post subject: Bleeding brakes

Just keep away from the Skydrol 



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

dosmythe(at)cox.net
Guest

Posted: Sat Mar 17, 2007 5:45 pm Post subject: Bleeding brakes

I have no idea what the "SKYDROL' comment means.  The subject is, Bleeding 

Brakes.  please try to stay on tract.  This is not a Chat Room.



Don Smythe

---

eskflyer(at)lvcisp.com
Guest

Posted: Sat Mar 17, 2007 6:00 pm Post subject: Bleeding brakes

Did u bother to do a internet search on SKYDROL

YES THIS IS A CHAT ROOM AND     I FOR ONE APPRECIATE NOEL'S POSTS.



KEEP EM COMIN NOEL



JOHN PERRY PISSED AT THE NON HUMOROUS ONES

---

84KF
Guest

Posted: Sat Mar 17, 2007 6:04 pm Post subject: Re: Bleeding brakes

" have no idea what the "SKYDROL' comment means."



Hey...I thought it was good humor. 



It makes a good car wax... go try it.  (just kidding group, just kidding)

Steve

eskflyer(at)lvcisp.com
Guest

Posted: Sat Mar 17, 2007 6:07 pm Post subject: Bleeding brakes

YEAH i am replying again For your INFORMATON SKYDROL is a aviation Hydraulic 

fluid .

Dont hammer on NOEL for  you not knowing what something is why dont you ask 

next time . and gee you might be informed and learn something new in your 

life .

It is staying on track because you do not want to put it in your brakes cuzz 

it will ruin all the seals .



Me again

JOHN PERRY STILL PISSED AT The NON HUMOROUS ONES

---

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sat Mar 17, 2007 6:43 pm Post subject: Bleeding brakes

Just read the post I replied to.   



Dave had mentioned to use a brake fluid with a mil spec.  Skydrol is also a

hydraulic (brake) fluid.  The problem is it will eat all the seals in your

brake system.  Then it will attack any plastics or rubber it comes in

contact with, with few exceptions.  The usable Mil specs MIL H- 5606, MIL

H-83282, or MIL H-46170 (I looked up the numbers to be sure) are not in any

way compatible with the synthetic Phosphate-ester base Skydrol/Hyjet which

may be left around a hangar.



If you need further explanation contact me off list.  I'll be happy to

accommodate you.



BTW. That comment was on track....as was my description of the method I've

been using for bleeding brakes for some time now.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

84KF
Guest

Posted: Sat Mar 17, 2007 8:13 pm Post subject: Re: Bleeding brakes

If I remember right from A&P school days, Skydrol is used in high-attitude aircraft, and very high pressure hydraulic systems. Like nitrogen, it will not contain  or absorb moisture,...which would freeze at altitude. As said before, very corrosive, and highly toxic to skin. It's no joke among the air-carrier mechanics. very bad stuff. But it works.

Anyway...  



steve

d(at)cfisher.com
Guest

Posted: Sun Mar 18, 2007 3:33 am Post subject: Bleeding brakes

Lowell,

Exactly ..............  pump the fluid from the bleeeder with a oil can. You 

will oush the air up to the master.

If you have loops in the line anywhere air will be pushed UP .



Doing it the way FLoyd mentioned might work but it would take alot more 

line, alot more time and might not get air trapped in a loop in the line.



Works for me fine with oil can , fast and efficeint and simple with no need 

to run lines from brakes to Masters.  I could see this getting messy



Make sure you use Mil spec fliud  5606 i think is the number.



Dave

---

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Sun Mar 18, 2007 7:24 am Post subject: Bleeding brakes

I've bled my brakes a couple of times (I had to replace wheel  

cylinder O-rings once) since I built my plane, and I use the oilcan  

method, combined with counting the number of strokes of the pumper.  

When I get to about 40 strokes, I measure the amount (with a dip  

stick) of fluid in the master reservoir, and if it is within a half- 

inch of being full, I suction it out with a small hypodermic. This  

method does not allow for ANY mess, if you pay attention, and refill  

the oilcan often, and check the master reservoir and reduce the  

volume when near full.

I found out the number of strokes needed by filling the master  

cylinder directly with the oilcan. This told me the maximum number of  

strokes to be applied (while bleeding) before the master cylinder  

should be emptied.

My plane has Cleveland master cylinders, Matco wheel cylinders, and  

one master reservoir.



Lynn



On Mar 17, 2007, at 7:00 PM, Noel Loveys wrote:



 	  Quote: 	
		   I start, surprisingly, by draining my brake system down enough to  

 be sure there will be no bubbles in the brake lines or master  

 cylinder.  Then I use a $1.95 pumper style oil can with a bit of  

 clear tubing pushed on over the end and put the other end on the  

 bleeding nipple.  I use the small pump in the oil can to drive  

 fluid into the wheel cylinder and back through the system.  Takes  

 around a can full (~3 oz.) of fluid to fill the brake system.



 You know when it is done by closing the bleeder and having a good  

 solid brake.  Just incase I put too much fluid in the system I wrap  

 the base of master cylinder/ reservoir with a rag.  Three times out  

 of four I don't need it.  Using a barb nipple in the top of the  

 reservoir to create a closed loop as far as I can see will cause a  

 bit more mess but never the less is interesting.

 Noel

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

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