Brake pedal bleeding down, master cylinder options?
Thread Starter
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Tuned
Joined: Dec 2014
Posts: 296
Likes: 2
From: Denver, CO
Brake pedal bleeding down, master cylinder options?
Brake pedal is bleeding down at stops, brake system needs attention obviously.
i replaced the factory soft lines with aftermarket Crown stainless about a year ago, no leaks found, and fluid in master cylinder has not dropped and still full.
Research so far points to master cylinder or ABS unit. I called Ford dealer today and they say the Motorcraft master cylinder is discontinued. Next best option?
I will try activating the ABS on a gravel road soon, any other advice? Forscan to bleed is what I understand the other option to be.
thanks!
i replaced the factory soft lines with aftermarket Crown stainless about a year ago, no leaks found, and fluid in master cylinder has not dropped and still full.
Research so far points to master cylinder or ABS unit. I called Ford dealer today and they say the Motorcraft master cylinder is discontinued. Next best option?
I will try activating the ABS on a gravel road soon, any other advice? Forscan to bleed is what I understand the other option to be.
thanks!
Cargo Master
Joined: Nov 2017
Posts: 3,096
Likes: 534
From: Rock Hill, SC
Not sure what your part number is, I just replaced most of my brake parts Sept 2022. The master cylinder, and calipers were avail new for my 7.3, 5C3Z-2140-LB. I see now the Master cylinder is coming up NLA, WOW....
Did your dealer do a nationwide search?
Here is the Dorman equivalent for the part I listed,
https://www.dormanproducts.com/p-23583-m390530.aspx
Did your dealer do a nationwide search?
Here is the Dorman equivalent for the part I listed,
https://www.dormanproducts.com/p-23583-m390530.aspx
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
The ABS will pulse the brakes, but I don't think it creates the pressure.
Amazon has the Dorman for $83 or Raybestos for $70.
The Raybestos and Dorman have the same part no., are they related somehow?
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
Interesting the Raybestos master cylinder on Amazon shows in the first picture one of the pressure sensors included, but doesn't show it in the last pic.
The Dorman doesn't show the sensor at all.
Not sure which sensor it is, but I remember reading one of the sensors is hard to find.
The Dorman doesn't show the sensor at all.
Not sure which sensor it is, but I remember reading one of the sensors is hard to find.
Mountain Pass
Joined: Apr 2017
Posts: 150
Likes: 0
I went down this road. Same symptoms. Changed master cylinder and no difference. Ended up getting a abs unit off eBay and had dealer put in. 100%
fixed
fixed
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Thread Starter
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Tuned
Joined: Dec 2014
Posts: 296
Likes: 2
From: Denver, CO
Just left a dirt lot where I was able to activate the ABS and confirmed it is "functioning" as you can feel the pulsing. Obviously it could still be the issue but starting with a master cylinder seems to be the logical (and cheapest) first step. Really hoping the ABS is not the source of the issue but won't know until after the master cylinder swap.
I cannot locate a Dorman locally and based on a busy work/family schedule I need to get the swap done today. Here's hoping that I don't regret installing an auto parts store house brand master cylinder...
thanks all for the advice and input!
I cannot locate a Dorman locally and based on a busy work/family schedule I need to get the swap done today. Here's hoping that I don't regret installing an auto parts store house brand master cylinder...
thanks all for the advice and input!
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Cargo Master
Joined: Nov 2017
Posts: 3,096
Likes: 534
From: Rock Hill, SC
Interesting the Raybestos master cylinder on Amazon shows in the first picture one of the pressure sensors included, but doesn't show it in the last pic.
The Dorman doesn't show the sensor at all.
Not sure which sensor it is, but I remember reading one of the sensors is hard to find.
The Dorman doesn't show the sensor at all.
Not sure which sensor it is, but I remember reading one of the sensors is hard to find.
Brake fluid sensor. The one from Ford included a new pigtail adapting the new supplied sensor to connect to your existing harness. The sensor vendor must have changed.
Thread Starter
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Tuned
Joined: Dec 2014
Posts: 296
Likes: 2
From: Denver, CO
Another thought on this issue. In the past I have knocked the vacuum line off the engine side connection resulting in loss of brakes. Pedal went to the floor but was more severe. I wonder if a slight vacuum leak could be the culprit…
Mountain Pass
Joined: May 2016
Posts: 245
Likes: 57
If you diagnose it as a bad vacuum booster, you could replace with a hydroboost setup. I had a donor truck, which made it much easier, here is a thread I made to document this: https://www.ford-trucks.com/forums/1...onversion.html.
I have found the hydroboost setup to be much more confidence-inspiring than the vacuum boost setup.
Good luck!
I have found the hydroboost setup to be much more confidence-inspiring than the vacuum boost setup.
Good luck!
