FAQs & Tech Tips

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New! MM Technical Services: MM’s Engineering Team will provide setup recommendations specifically tailored for your Mustang. Get help choosing options for a Maximum Grip Box, deciding on coil-over spring rates, selecting a brake master cylinder, and advice on converting your Fox to Hydroboost.

New! Swapping a Coyote into a Fox Mustang? MM's Hydroboost Conversion Kits allow easy installation of a 1996-2004 Mustang Hydroboost power brake assist unit into a 1979-1993 Mustang.

New! Swapping an IRS into your Fox Mustang? MM makes it easier with a brake line kit made just for this conversion. Bolts-in, with no cutting or flaring of brake lines. Designed to fit standard IRS brake hoses.

New! MM now offers a tool for the giant nut securing a Mustang Hydroboost. This MM socket fits the 1-7/8" nut holding the Hydroboost to the firewall mount. Required when changing a Hydroboost unit.

New! MM's billet aluminum Pedal Box Spacer for Fox Mustangs. Replace the breakage-prone OEM plastic spacer when converting to manual brakes or Hydroboost.

Canadians! Please read the latest about ordering from Canada/shipping to Canada.

We've posted the parts list and link to the video of MM's Mustang in /DRIVE Tuner car Shootout

Replacement O-rings for Mustang power steering rack fittings, 1979-2004
Actual product may differ from photo.


  • Item # Service-9
  • Manufacturer: Maximum Motorsports


These O-rings seal the connection between the power steering hose fittings and the steering rack. The stock O-rings will not survive more than just a very few times tightening the fitting to the rack.

These same O-rings and sealant are included in our AN hose power steering fitting kit. (ST-73)

  • Includes two pair of PTFE O-rings to seal the hose fittings to the steering rack.
  • Includes hydraulic pressure-rated thread sealant.
  • Does not include hoses or hose fittings.

Related Products

  • New O-rings to replace your worn, damaged, leaky seals
  • Hydraulic thread sealant provides secondary seal.
  • Two pair of PTFE O-rings
  • Two sizes, to fit the two fittings on the Mustang
  • Hydraulic thread sealant


You can read Maximum Motorsports' highly detailed Service-9 installation instructions before purchase.