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Old 03-12-2023, 07:33 PM   #1
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Update on Brake Job

With the help of my nephew we are finally in the installation process, replaced all brake lines, removed rotors from hubs, rebuilt the hydro boost, going to replace front bearings, seals and races, and seals on rear.
Iím having trouble figuring out what master cylinder I should order from Rock Auto, I have cruise control, does anyone have any suggestions which one to order ?
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Old 03-12-2023, 08:12 PM   #2
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Quote:
Originally Posted by RV LYONS View Post
With the help of my nephew we are finally in the installation process, replaced all brake lines, removed rotors from hubs, rebuilt the hydro boost, going to replace front bearings, seals and races, and seals on rear.
Iím having trouble figuring out what master cylinder I should order from Rock Auto, I have cruise control, does anyone have any suggestions which one to order ?
Thanks Attachment 388048Attachment 388049Attachment 388050
I have retired after 50 years of pro mechanic. Have always had good service from Raybestos Brake Products. I also own a 1996 Bounder on a 1995 F-53 chassis with cruise like yours. Looking at RockAuto, I see the dilemma and I see the difference. The listing for "with cruise" has a third port besides the two side ports.

Looked at my chassis and only two ports. Also second port has a fitting installed that brake line attaches to. The "with cruise" master cylinder has both side ports tapped into the casting in addition to the third port. You can see it in the RockAuto pictures.

My F-53 would use the Raybestos #MC39876 even though it is listed for without cruise. If you only have the two ports and the second port has that fitting, That's the one I would get.
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Old 03-12-2023, 08:32 PM   #3
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I have retired after 50 years of pro mechanic. Have always had good service from Raybestos Brake Products. I also own a 1996 Bounder on a 1995 F-53 chassis with cruise like yours. Looking at RockAuto, I see the dilemma and I see the difference. The listing for "with cruise" has a third port besides the two side ports.



Looked at my chassis and only two ports. Also second port has a fitting installed that brake line attaches to. The "with cruise" master cylinder has both side ports tapped into the casting in addition to the third port. You can see it in the RockAuto pictures.



My F-53 would use the Raybestos #MC39876 even though it is listed for without cruise. If you only have the two ports and the second port has that fitting, That's the one I would get.


Thanks, mine has 3 ports, for the cruise control.
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Old 03-12-2023, 08:52 PM   #4
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Thanks, mine has 3 ports, for the cruise control.
The 3 port Master Cylinder is RAYBESTOS MC390158.

Going to make me look why mine is different. Third port must go to a cruise cutoff switch. Thinking mine must have a brake pedal cutoff switch.
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Old 03-13-2023, 12:21 PM   #5
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The 3 port Master Cylinder is RAYBESTOS MC390158.



Going to make me look why mine is different. Third port must go to a cruise cutoff switch. Thinking mine must have a brake pedal cutoff switch.


Mine definitely has 3 ports, Iíll order that master cylinder, what dot brake fluid should I use ? Thanks again
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Old 03-13-2023, 02:13 PM   #6
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Mine definitely has 3 ports, Iíll order that master cylinder, what dot brake fluid should I use ? Thanks again
I would stay with DOT 3 brake fluid. Dot 4 has a slightly higher boiling point, but absorbs moisture faster. Requires more frequent changing. DOT 5 and 5.1 are silicone based and don't mix well with glycol based DOT 3.

Both Ford and Raybestos recommend DOT 3. Works for me.
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Old 03-13-2023, 03:23 PM   #7
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I would stay with DOT 3 brake fluid. Dot 4 has a slightly higher boiling point, but absorbs moisture faster. Requires more frequent changing. DOT 5 and 5.1 are silicone based and don't mix well with glycol based DOT 3.



Both Ford and Raybestos recommend DOT 3. Works for me.


Thanks, I wasnít sure
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Old 03-13-2023, 04:22 PM   #8
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Just a side note, that 3rd port is for the speed control secondary kill switch, check to see if you have the recall update installed, it has a fuseable link the switch
Is prone to leak corroding the wire harness that attaches to it, resulting in possible thermal event.
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Old 03-13-2023, 05:21 PM   #9
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Just a side note, that 3rd port is for the speed control secondary kill switch, check to see if you have the recall update installed, it has a fuseable link the switch
Is prone to leak corroding the wire harness that attaches to it, resulting in possible thermal event.


avfordguy

I bought the rv in 2007, from the original owner, he gave me the recall notice for the Cruise Control, I had it completed at the local dealer. We removed a sensor from the 3 rd. Port on original master cylinder.
Thanks
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Old 03-25-2023, 04:53 PM   #10
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avfordguy

I bought the rv in 2007, from the original owner, he gave me the recall notice for the Cruise Control, I had it completed at the local dealer. We removed a sensor from the 3 rd. Port on original master cylinder.
Thanks


Weíre making progress, brake lines completed, we used 3/16Ē copper/ nickel.
New rotors. Waiting for caliper rebuild kits.
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Old 03-26-2023, 07:40 AM   #11
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Old 03-26-2023, 03:06 PM   #12
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Impressive. That's a lot of rotating mass there. Will be as new, when you're done.
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Old 03-26-2023, 07:48 PM   #13
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Impressive. That's a lot of rotating mass there. Will be as new, when you're done.


Itís gonna stop on a dime and give me 11 cents change
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