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Wilwood High Volume Aluminum Master Cylinder

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1/8" NPT
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3.50" pushrod
Wilwood High Volume Aluminum Master Cylinder

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Q & A

What's in the Box

Wilwood high-volume aluminum master cylinders have the highest fluid capacity of any integral reservoir design. With a total capacity of 8.2 ounces, there is at least 26% more fluid than most competitive brands. More fluid volume means cooler temperatures and additional insurance for extreme conditions where high pad wear can compromise fluid levels during long events. With 1-7/16" of piston travel, there is plenty of margin when used with large four or six piston calipers.

An internal slosh baffle guarantees a constant fluid supply to the bore chamber during hard cornering, acceleration and braking. This unique baffle also eliminates aeration into the reservoir from return fluid that can occur during brake release and bleeding procedures.

  • Die-cast from high-grade aluminum
  • Heavy-duty internal piston springs provide fast retraction for immediate release and positive fluid transfer without the need for cumbersome external pushrod springs
  • Pedal feel is improved, piston retraction is guaranteed, fluid recovery is quicker and the bleeding process is simplified
  • Formed steel lids, heavyweight bail wires and bellows type gaskets keep the fluid in and the moisture out with correct pressure balancing during fluid displacement
  • 1/8"-27 NPT fluid port

835-260676 Instructions (PDF)

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection.

You may also be interested in:

Wilwood 290-0632 570 Brake Fluid, 12 oz Bottle
(Part #8352900632)

Wilwood's specially formulated Hi-Temp 570° Racing Brake Fluid has a minimum 570 degree dry boiling point to withstand the severe heat requirements of automotive racing. Hi-Temp 570's low viscosity allows easy bleeding of your brake system, eliminating aeration of the brake fluid caused by foaming due to excessive pumping of the pedal. 

This high temp brake fluid comes in a convenient 12 ounce container hermetically sealed to guarantee against unwanted absorption of moisture which can drastically lower the fluids boiling point (fluid from larger containers tends to become contaminated with moisture, lowering its boiling point and making it unsuitable for racing applications). 

  • Dry Boiling Point:  573° F
  • Wet Boiling Point:  313° F

8352900632 Instructions (PDF)

Wilwood Combination Remote Fill Master Cylinder Kit
(Part #70174)

Six different bore sizes and four different installation configurations are available in this master cylinder kit. Precision machined from high strength aluminum, this kit includes both small and large size reservoirs which can be mounted for more convenient service access. Standard mounting bolt hole configurations provide easy applications for racing and off road vehicles, specialty cars, recreation and industrial vehicles.

Bore sizes available include: 5/8", 3/4", 7/8", 13/16", 1", 1-1/8".

  • Includes small and large reservoirs which can be direct or remote mounted
  • Aluminum cylinder with plastic reservoir tank
  • Mounting flange is a vertical pattern on a 2-1/4" on center
  • Master cylinder has a single 3/8-24 brake line outlet
  • The two side mount holes are 3" from center to center

70174 Instructions (PDF)

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection.

Wilwood 290-6209 EXP 600 Plus Racing Brake Fluid, 500 ML Bottle
(Part #8352906209)

EXP 600 Plus is a highly refined blend developed for extreme performance under the high heat and extreme pressure of professional motorsports. EXP 600 Plus has been tested to 626° F with a wet boiling point of 417° F. These numbers far exceed any DOT or SAE specifications. 

It is true that racing brake fluids need to have high boiling points. It is also true that fluids need to have low moisture affinity to slow the natural absorption rate of water vapor. But the true test of any high temp brake fluid is how well it resists aeration and compressibility after it has been heated and pressure cycled a few hundred times. The real test is at the track. EXP has been proven to maintain firm pedal feel and quick response, long after others have failed. 

Note: For optimum performance, EXP 600 Plus should not be diluted with any other brake fluids. Add new fluid to a clean system. 

8352906209 Instructions (PDF)

Master Cylinder Return Spring Kit
(Part #9402400)

Helps keep the driver from burning up the brakes. Works with most single bail aluminum racing master cylinders. Includes spring and retainer. 

  • Zinc-plated high strength coil spring
  • Anodized billet aluminum retainer
  • Made in the U.S.A. 
  • Spring Diameter:  1-3/4" O.D.
  • Free Height:  3-1/4"
Wilwood Compact Master Cylinder
(Part #835260103)

Wilwood’s Compact Combination Master Cylinders have been designed for limited space applications requiring the output capacity of a full size master cylinder. The ultra short 3.37”compact body provides 2.16” of additional clearance between the mounting flange and the fluid outlet. A full 1.12” of piston stroke meets or exceeds the stroke capacity of most full size cylinders. With 1/8” NPT fluid outlet port located at the top radius of the cylinder bore, reduces the chances for trapped air. The black E-Coated aluminum body resists corrosion and maintains a durable long lasting finish. 

Includes a large and small reservoir, hose and hardware for remote mounting if required. Features a heavy internal return spring.

835-260103 Instructions (PDF)

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection

AFCO Integral Reservoir Master Cylinder
(Part #106662)
                        AFCO engineers started with a clean sheet when  they designed their new line of master cylinders. Utilizing experience  from their market-leading master cylinders, AFCO's new model offers the  great performance that you would expect from an AFCO product.

With one-piece design that incorporates a high-capacity reservoir and precisely machined/polished cylinder bore, the new piece makes efficient use of space and materials.
  • External return spring maintains positive feel and helps prolong pad life by ensuring quick reaction to released pedal force
  • Precise fitting lid held in place by a heavy gauge retainer
  • Slim design rubber boot allows easy installation into most pedal assemblies
  • Aluminum bore with hard anodized pistons
  • Unique built-in minimum and maximum fill tabs are easy to read and make quick work of checking fluid even in dark pit areas
  • Common dual-mounting bolt patterns for most racing applications
  • Choose 3/4, 7/8, or 1" bore
  • Designed for 1/8" NPT fittings for easy replacement

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection.

Wilwood 330-7085 High Volume Master Cylinder Replacement Lid
(Part #8353306724)

Formed steel lid with bellows type gasket to keep the fluid in and the moisture out with correct pressure balancing during fluid displacement. Replacement for Wilwood high volume aluminum master cylinders.

Wilwood 260-6898 High Volume Master Cylinder Rebuild Kits
(Part #8352606-0750)

Rebuild kit for Wilwood high volume master cylinders. Contains piston, seals, snap ring, push rod, lid gasket and replacement dust boot assembly. All parts necessary for maintenance and repair of your master cylinder.