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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6345
Experience:  ASE Master Certified, ASE Advanced Gasoline Engine Performance
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Can't get brake master cylinder off 2001 ford e150

Customer Question

Can't get brake master cylinder off 2001 ford e150
Submitted: 7 months ago.
Category: Ford
Expert:  A. Penland replied 7 months ago.

Cannot get it off the brake booster or are you talking about the fluid reservoir?

Customer: replied 7 months ago.
Booster
Customer: replied 7 months ago.
Took nuts off. Disconnected brake lines. Screwdriver to pry off. Got air leaking so I stopped and got you
Expert:  A. Penland replied 7 months ago.

Do you have retaining nuts removed that hold the master on the booster?
DO you have the brake lines off the master?

Customer: replied 7 months ago.
Expert:  A. Penland replied 7 months ago.

You will have to move it side to side to wiggle it loose from the studs. There is a seal between the booster and the master. Also, remove the vacuum line from the booster to release the vacuum.

Customer: replied 7 months ago.
Did all that
Expert:  A. Penland replied 7 months ago.

Can you send a picture of the booster and master cylinder retaining points?

Customer: replied 7 months ago.
Did you get it
Expert:  A. Penland replied 7 months ago.

Ok. There is corrosion on the studs that the master cylinder slides onto. If you have not already, spray penetrating oil onto the studs and push down on the front of the master and try to work it free once you allow the penetrating oil to work into the corrosion. The corrosion is built up and is stopping the master from sliding off the studs. You may need to carefully work a flat blade screwdriver between the booster and master to get it loose.

Customer: replied 7 months ago.
I used screwdriver and I got air leaking so I stopped and got you
Expert:  A. Penland replied 7 months ago.

Take the vacuum line off the booster. It should be attached to the upper corner of the booster. It is a large rubber hose with a plastic check valve inserted into the booster through a rubber o ring. What you were hearing is vacuum releasing which is normal.

Customer: replied 7 months ago.
I'm using pb blaster
Customer: replied 7 months ago.
What is the air coming from
Expert:  A. Penland replied 7 months ago.

The air coming from the brake booster. There is a seal between the master cylinder and the booster to keep the vacuum sealed in the booster.

Customer: replied 7 months ago.
There is no seal with the new master
Expert:  A. Penland replied 7 months ago.

There should be. It is a rubber seal like o ring.

Customer: replied 7 months ago.
About an inch in diameter
Expert:  A. Penland replied 7 months ago.

I should fit around the master cylinder section that inserts into the brake booster. It will be about 1/8 " thick.

Customer: replied 7 months ago.
How about a torch
Expert:  A. Penland replied 7 months ago.

Be careful with a torch. You do not want to damage the rubber vacuum diaphragm in the brake booster. You damage that, and you will have to also replace the brake booster.

Customer: replied 7 months ago.
Maybe mc isn't my problem. What's the box the brake lines go to
Expert:  A. Penland replied 7 months ago.

That is the ABS assembly for the anti lock brakes. What is the problem you are having?

Customer: replied 7 months ago.
3 of my brakes aren't releasing both front and right rear
Customer: replied 7 months ago.
They're so hot you could fry an egg on them I've replaced right rear seal 3 times
Customer: replied 7 months ago.
The rear adjustment wheel are screwed all the way in?????
Expert:  A. Penland replied 7 months ago.

It could be the ABS system, the HCU (Hydraulic Control Unit). This is the mechanical side of it and it sends and controls the brake fluid to all 4 wheels.

Customer: replied 7 months ago.
Ah ha so what should I do now
Expert:  A. Penland replied 7 months ago.

First, inspect the rubber flex lines to each wheel for kinks and swelling. Then replace the HCU for the ABS system.

Customer: replied 7 months ago.
not the master cylinder
Expert:  A. Penland replied 7 months ago.

The master cylinder will not cause one wheel to lock up. It will either effect all 4 wheels, or just the front or just the rear. The ABS system controls all 4 wheels.

Customer: replied 7 months ago.
Any way to test
Expert:  A. Penland replied 7 months ago.

With all 4 wheels up on jack stands. step on the brakes and release. See if any wheels are locked up. Then crack the brake line to that wheel, se if it frees up. If it does, the problem is the HCU.

Customer: replied 7 months ago.
I will try it
Expert:  A. Penland replied 7 months ago.

ok

Customer: replied 7 months ago.
Have you ever seen green or black brake fluid
Expert:  A. Penland replied 7 months ago.

No. Brake fluid should be clear. New fluid is. If it is green or black, it is either really old and dirty or contaminated with something other than brake fluid.