Brake Reservoir
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Senior User
Joined: Feb 2003
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Brake Reservoir
On my 79 f-150 4x4 the front portion of the reservoir is alway dropping fluid. Not very fast, but once every couple of months it will be down an inch or so from the top. Any ideas what would be causing this? (I havent checked all the lines yet)
Thread Starter
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Senior User
Joined: Feb 2003
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Brake Reservoir
A little more detail........not only is it dropping in front, but it seems to be over filling the rear portion of the reservoir, as when you take the cover of, fluid spills all over off of the back. Also, this is the third master cylinder we have tried.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Brake Reservoir
Afraid to say, bad master cylinder.
Next time you replace it flush out the entire brake system. You may have some contamination in the system. Something is causing the seals in the master cylinder to go bad.
Next time you replace it flush out the entire brake system. You may have some contamination in the system. Something is causing the seals in the master cylinder to go bad.
Last edited by Torque1st; May 27, 2003 at 08:29 PM.
Senior User
Joined: Aug 2002
Posts: 176
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From: Indianapolis USA
Brake Reservoir
Where do you get & what brand are made with stainless
sleeves ? I've had the same type of master cylinder probs. with
both my '79 F150's. My first went through them every couple
years, and this one's leaking out the back by booster now.
Was going to post on this, but looks like I'm not the only one...
Thanks. J.R.
sleeves ? I've had the same type of master cylinder probs. with
both my '79 F150's. My first went through them every couple
years, and this one's leaking out the back by booster now.
Was going to post on this, but looks like I'm not the only one...
Thanks. J.R.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Brake Reservoir
Look for a company that strocks ....EIS brake parts
Do a www.google.com for : Master Cylinder with Stainless Steel Sleeves
Do a www.google.com for : Master Cylinder with Stainless Steel Sleeves
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Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Brake Reservoir
Actually if the manufacturers used cast iron they would be OK. Unfortunately they haven't used cast iron in about 20-30 years. Cast steel is used for brake parts nowadays. Cast steel does not have the same excellent corrosion properties that cast iron does.
Stainless does work well
Stainless does work well
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Posting Guru
Joined: Aug 2000
Posts: 1,984
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Brake Reservoir
I just finished installation of a new master cylinder on mine. I did buy a new one, instead of rebuilt. Changing the brake fluid every year or two will 'help' to prevent the corrosion. The DOT 3 fluid is very hygroscopic (absorbs water), and this is what corrodes the master cylinder bore.
Stainless steel; now why didn't I think of that........?
Stainless steel; now why didn't I think of that........?
Senior User
Joined: Aug 2002
Posts: 176
Likes: 0
From: Indianapolis USA
Brake Reservoir
Hey Dennis,
Looked in yahoo & google and at company that had EIS parts,
but couldn't find Ford master cylinders that had stainless sleeves.
Are these available, or do you have to send out yours to have
it sleeved ? One company offered this service, but would like
to buy one ready to bolt in if possible... Thanks. J.R.
Looked in yahoo & google and at company that had EIS parts,
but couldn't find Ford master cylinders that had stainless sleeves.
Are these available, or do you have to send out yours to have
it sleeved ? One company offered this service, but would like
to buy one ready to bolt in if possible... Thanks. J.R.