Update on Brake Job

[RV LYONS]

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.
I’m 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

[code2e]

Originally Posted by RV LYONS

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.
I’m 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.

[RV LYONS]

Originally Posted by code2e

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.

[code2e]

Originally Posted by RV LYONS

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.

[RV LYONS]

Originally Posted by code2e

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, I’ll order that master cylinder, what dot brake fluid should I use ? Thanks again

[code2e]

Originally Posted by RV LYONS

Mine definitely has 3 ports, I’ll 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.

[RV LYONS]

Originally Posted by code2e

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 wasn’t sure

[avfordguy]

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.

[RV LYONS]

Originally Posted by avfordguy

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

[RV LYONS]

Originally Posted by RV LYONS

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

We’re making progress, brake lines completed, we used 3/16” copper/ nickel.
New rotors. Waiting for caliper rebuild kits.

[RV LYONS]

[code2e]

Originally Posted by RV LYONS

Attachment 388883Attachment 388884

Impressive. That's a lot of rotating mass there. Will be as new, when you're done.

[RV LYONS]

Originally Posted by code2e

Impressive. That's a lot of rotating mass there. Will be as new, when you're done.

It’s gonna stop on a dime and give me 11 cents change