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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

SN95 Hydroboost in a Fox | Brake lines

  • Thread starter Thread starter arc_jpiv
  • Start date Start date Sep 4, 2025
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    brakes foxbody
A

arc_jpiv

New Member
Sep 4, 2025
1
0
1
Florida
Sep 4, 2025
#1
  • Sep 4, 2025
  • #1
Hey y'all,
found an sn95 hydroboost unit with MC in my local boneyard for about 50 bucks. Got it back, drilled 2 holes and threw it right in my 93. I've setup HB units before on my truck and Bronco, so I get the hydraulic part.

My mustang has 3 brake lines that I can see. Two from the prop-valve and one comes up by the fuel hoses. I think 2 are for the fronts and one runs to the rear.
My master cylinder (99-04) has 4 ports, 2 on the side, 2 on the bottom. Which ports do the brake lines thread into the MC? Is there any specific order?

TIA,
Parker

 
D

dljr415

New Member
Apr 27, 2025
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0
1
San Francisco ca
Jan 9, 2026
#2
  • Jan 9, 2026
  • #2
What’s up guys I’m new here was wondering if anyone had any tips on what Willwood master cylinder I should run on my 89 fox if I’m running a hydroboost setup from a 99 mustang? I already have my Willwood disc brake kit for the front I’m about to order the rears today but I wanna know what master I should get and if anyone has done it?
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,846
3,975
183
Claremore, OK
Jan 10, 2026
#3
  • Jan 10, 2026
  • #3
Call Willwood as they should know this being a brake designer and manufacturer.
 
Reactions: General karthief and dljr415

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,236
17,921
224
Massachusetts
Jan 10, 2026
#4
  • Jan 10, 2026
  • #4
Regardless of the MC, you need to do a 2-port conversation on the Fox. Max Motorsports sells kits for this. Which one you get depends on the MC.

If using the SN95 MC you need to know which one you are using as there are 4 of them.

Brake Line Kits

Same goes for the Wilwood. Need to know the application as it will vary the two ports in the MC.


I’m using hydroboost with a Baer MC myself
 

2000xp8

SN Certified Technician
Aug 8, 2003
8,022
1,615
194
NJ
Jan 14, 2026
#5
  • Jan 14, 2026
  • #5
Doesn't look like you used the hydroboost mounting kit from maximummotorsports.
I'd rethink that plan before going further, the geometry is going to be off and the brakes feel notably better with the kit.
 
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