2004 Mountaineer Brake Issues
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2004 Mountaineer Brake Issues
So we've been having issues with the brakes. We installed two front calipers and new rotors. We can't seem to bleed the brakes, we have plenty of fluid going through but no pressure. We also installed and bench bled a new Master Cylinder. We are getting plenty of fluid out of all 4 calipers but no pressure. It seems to not be building any pressure. We also hear a whooshing/sucking noise in the front driver side but cannot pinpoint a location. We can hear this every time we pump the peddle but no obvious leaks and we are not loosing fluid.
Logistics Pro
Joined: Jun 2009
Posts: 4,817
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From: Cedar Rapids, IA
What do you mean by "plenty of fluid...but no pressure?" Do you mean that even though there's a lot of fluid that comes out the lines when the bleeders are open, you are not getting strong braking force?
Could the whooshing sound you are hearing be an issue with the vacuum brake booster?
-Rod
Could the whooshing sound you are hearing be an issue with the vacuum brake booster?
-Rod
Senior User
Joined: Apr 2009
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From: Isanti, MN
Sounds like the ABS unit. Have someone listen with a big screwdriver to their ear on the ABS module while you bleed the brakes or just see if they can hear it outright from the ABS unit. Entirely possible that you have an open solenoid. You might try disconnecting the battery or try to cycle the solenoids to see if they are all able to move.
Senior User
Joined: Apr 2009
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From: Isanti, MN
Either a scan tool with bidirectional support ( mechanic grade) or you're going to have to look at the wiring diagrams to see what you need to jump to activate them. A factory service manual would be ideal to have as it would outline the test procedure. You might be able to determine a problem looking at the abs unit with a multimeter... I'd have to look at whatever documents I have a bit to help you further ( I'm at work currently)
Logistics Pro
Joined: Jun 2009
Posts: 4,817
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From: Cedar Rapids, IA
Does your Mountaineer have a 3-channel or 4-channel ABS system? One way to tell is to look for an "RSC" or "AdvanceTrac" logo. Another way would be to look for rear wheel speed sensors. If there's a sensor on each rear wheel, it's 4-channel. If there's only one sensor and it's on the rear differential housing, it's 3-channel.
If you have a 4-channel ABS system then I really doubt the ABS is the cause for the lack of fluid to rear.
Also, you don't have the key on when you're bleeding the brakes, do you? If so, there's no reason to have the key on and I recommend you don't turn it on. Plus, with the key off, the ABS pump will not run or perform the self test so without the key on, if you still hear the noise, it's not the ABS.
-Rod
If you have a 4-channel ABS system then I really doubt the ABS is the cause for the lack of fluid to rear.
Also, you don't have the key on when you're bleeding the brakes, do you? If so, there's no reason to have the key on and I recommend you don't turn it on. Plus, with the key off, the ABS pump will not run or perform the self test so without the key on, if you still hear the noise, it's not the ABS.
-Rod
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