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Air in braking system?

3 months after having a service at a back street garage my brakes have become weak. A friend had a look in the fluids resivior and told me that the brake fluid had been mixed with oil to top it up. The fluid in the resivior is thick and slimey and of a creamy texture. I have tried to drain the system and flush it with new fluid but the braking system appears to be air locked or jammed with slime. How do i shift the air or slime and fill the system with correct new fluid? Thanks for your help.

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If your system has been contaminated you will need to replace the Master cylinder first. You have to hope that the contaminant did not get down to the calipers because the seals for brake systems will not hold up if there is oil. Remove the master and open all bleeders. Use some low pressure compressed air and blow out the system. Install the new master, fill it up and let the system gravity bleed until you see fluid is coming out of the bleeders. When you have fresh fluid coming out of all the bleeders close them and follow the sequence below to bleed air.

If some of them are not gravity bleeding, close the one that are and give it more time. If still some will not bleed, have someone close all the bleeders and open the farthest from the Master. Rt. Rear. Left Rear. Rt front, Left front is the bleed sequence. You may have to do this several times. (the locations are sitting in your drivers seat)

I have had to repair many cars in the late 90's when a shop in Albany NY had an employee that was deliberately contaminating brakes. It takes two months to destroy the seals in the Master. Again I hope it has not made it's way to the calipers or wheel cylinders. If contaminant made it down there, do not waist the time or money trying to clean them, put new one on the car. You do not want them to fail and when they do it will be when you apply your brakes hard to stop fast, then it will be too late.

hope this helps.

Posted on Apr 27, 2010

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Then master cylinder maybe damaged from the contamination,you may need to replace the master,try bleeding the master cylinder at the brake lines to clean it out,then start at the right rear wheel,then the left rear wheel,then the right front wheel,and then the left front wheel,do this in order.

Posted on Apr 27, 2010


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HINT: If any work is done on the brake system or if air in the brake lines is suspected, bleed the air from the system.

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b)BLEED MASTER CYLINDER HINT: If the master cylinder has been disassembled or if the reservoir becomes empty, bleed the air from the master cylinder.

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