Another Question On Changing Brake Fluid
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Senior User
Joined: Nov 2003
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From: Gainesville, MO
Another Question On Changing Brake Fluid
I was doing some reading in my repair manual on the 4 wheel antilock system and ran across several caution warnings on changing calipers, master cylinder and the wheel cylinders. It cautions against opening the system due to the chance of getting air into the abs system which requires an "expensive tool found only at dealerships or specially equiped shops" to bleed the system. I was just curious if anyone had ran into this problem.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
If you keep the master cylinder from running totally dry when changing calipers or hoses, or when bleeding, then there is very little chance that air can get into the ABS system. The key is to not allow the fluid to spill freely all over the place once things are apart.
Cargo Master
Joined: Nov 2004
Posts: 2,858
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From: Friendswood, Texas
What about changing the master cylinder? Is bench bleeding the MC and bending the tubing form the MC to the ABS unit upward while the MC is out sufficient to keep air out of the ABS unit?? I need to replace the MC and this year and a half oldthread is the first one I've seen where somebody asked about it. Surely someone has replaced the MC on a pre-97 with 4-wheel ABS system. I'm probably being overly concerned but I would really like to hear form someone who's done it before I do mine.
Senior User
Joined: Nov 2003
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I have not replaced my MC, but I did change both of my front disk pads on my 98 Ranger. I don't have front ABS brakes, but my brake light keep comming on. I was loosing brake fluid somewhere. My reservoir in the MC needed to be filled up every-other -day. After a week I was able to take the time to look closerat my whole system. My right wheel cylinder was leaking. After replacing it, no more problems. My poit is I did have to read/re-read my repair manual....It said if you get air past the bottom of the MC while bleeding your brakes that it could get air in the ABS controller. If air gets into it, the ABS light would come on. Then you would need the ABS controller bled at the shop using that special tool. I too would like to know more details ot THAT procedure.
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