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Brake Kits

Q:   How can I figure out if the brake kit I want will fit my wheels?

A:  Most kits require use of a 15" wheel or larger.

For your specific vehicle you can go to the Wilwood website and look up the kits that are available for your make and model. Once you have determined the kits that are available, pick the one that interests you and pull up the “data sheet.” It will provide dimensional drawings for actual brake caliper clearance requirements. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   Will the Wilwood front brake kit affect my track width?

A:  We try to keep our kits as close to the factory “off-sets” as possible and for the most part we meet stock dimensions. On some kits it is impossible to do so and our track width will be slightly wider than stock. Our Bolt-On Brake Kit Catalog contains the track width change for each kit; please refer to your particular application’s data sheet for the exact measurements. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   What brake kit fits my factory rear end?

A:  With over 870 bolt-on kits, Wilwood manufactures brakes for most front and rear applications, and we're constantly adding to the list. You can look up what kits are available for your make and model on our website. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   How do I measure my axle off set?

A:  Measure the distance from the face of your axle-housing flange (where the drum brake backing plate is attached) to the outer face of the axle flange where the wheel studs come through. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support .

Q:   How do I measure & determine my axle flange?

A:  There are 4 bolts that hold the drum brake backing plate to the axle housing flange. Measure the distance between the bolts, horizontally and vertically, center to center. Compare these measurements with the following dimensions: (A) Overall width; (B) Overall height; (C) Top bolt spacing; (D) Lower bolt spacing; (E) Front bolt spacing; (F) Rear bolt spacing and (G) the diameter of the bearing or tube. Using those measurements you can compare it with the axle housing flange chart in the Wilwood website. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   What is the basic difference between a drag kit and a pro street kit?

A:  Drag kits use solid steel rotors (or optional drilled rotors) and yield high brake torque, yet are very lightweight. They are engineered to the absolute minimum in rotating and un-sprung weight, where all that is required is a single stop at the end of a drag run. The lightweight steel rotor is not designed to absorb and release the heat generated when driving in normal traffic and will warp quickly when used on the street. Pro street kits use cast iron rotors that are .810” thick, weighing 7.9lbs.

Their vented design and cast iron material allows them to absorb and release the heat generated when driving in normal traffic.

These kits offer a substantial weight savings over factory disc brakes due to the use of aluminum hubs, rotor adapters, calipers and brackets, while the vented cast iron rotors offer long term durability for street use.

Q:   Do bolt-on brake kits require any alteration to the spindles or rear axles?

A:  Front brake kits occasionally require minor modifications to the spindle such as drilling and tapping a bolt hole to a larger size. Rear axle kits require no modifications provided that you purchase the correct kit for your housing flange and offset. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   Do installation instructions come with Wilwood brake kits?

A:  Yes. With the exception of certain custom applications, all Wilwood kits include step-by-step installation instructions. Please note that brake kits and components should only be installed by experienced mechanics with a good understanding of brake systems.

Q:   What bolt patterns and stud sizes are available in Wilwood bolt-on brake kits?

A:  Front kits, which include Wilwood aluminum hubs, have ½" studs. With a few exceptions, hubs are manufactured to accept both 5x4.50" and 5x4.75" bolt patterns. Hats used in front kits are generally drilled to fit over the original OEM studs. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   Why don't you make a brake kit to fit my application?

A:  Wilwood has over 870 bolt-on kits that fit most front and rear applications and we're constantly adding to the list. If you can’t find your kit on the website, or in our kit catalogue, call and speak to one of our sales representative. They will direct you to a Wilwood dealer who assembles and sells kits using Wilwood components. Chances are good they will have one that fits your application. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Q:   How much better is braking going to be if I use your product over stock?

A:  Most modern stock brake systems work well for average daily street driving and an occasional 60-0 or 80-0 stopping. Typically performance enthusiasts who occasionally compete in racing events, push the stock brake system beyond its capabilities. Driving style, and other performance modifications such as increased horsepower, tire and suspension upgrades, etc., can quickly overwhelm stock brakes. A big brake kit will provide increased heat capacity, which means substantially more resistance to brake fade and caliper distortion with multiple stops from high speed. A firmer pedal due to stronger and stiffer components, as well as better modulation characteristics are also benefits of a properly balanced brake upgrade.

Q:   Will your bolt on brake kits work with the factory power booster and master cylinder?

A:  Yes, our kits are designed to work optimally with your factory setup. If you have any questions, please contact a Wilwood Sales Technician at 805-388-1188 or email Sales/Tech Support.

Wilwood Engineering, Inc
4700 Calle Bolero
Camarillo, CA 93012
Phone: (805) 388-1188
Fax: (805) 388-4938

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