Owner's manual

Wilwood • Phone 805 / 388-1188 • Fax 805 / 388-4938 • www.wilwood.com
E-mail Technical Assistance: [e-mail]
• Always mount the master cylinder to a
secure, reinforced element of the chassis.
There should be no movement or
deflection at the mount point when brake
pedal pressure is applied.
• Prior to attaching the fluid lines, fill the
reservoirs with Wilwood fluid from a new,
sealed container and purge any air from
the master cylinder. Be sure the cylinder is
level during the bleeding operation. If the
cylinder is not level when mounted in the
vehicle, you can perform this operation
prior to attaching the master cylinder to its
mount. The diagram illustrates one
method of recycling the fluid into the reservoir until all air has been eliminated. Exercise care to
not spill or spray brake fluid. Take all proper safety precautions including eye and skin protection
and do not position your face directly above the reservoir. This process will assure a quick and
effective full system bleed later.
• Once all fluid connections have been made, the complete system must be bled and checked
for leaks prior to any test of the vehicle.
Plumbing Notes and Precautions
• Each master cylinder kit includes one 9/16-18, one 1/2-20, and two 3/8-24 inverted flare
threaded line adapters for connections to the brake lines (Adapters are not installed and are
shipped in the reservoir of the master cylinder, remove lid to access). Two hex head plugs are
supplied to block the unused outlet ports. Pressure may be taken from either side of the master
cylinder. After selecting the size and location of the outlet ports to be used, lubricate adapter fitting threads lightly with silicone or
lithium based grease, then install the fittings and plugs, using the aluminum crush washers and torque each to 20-25 foot pounds.
• The line adapters supplied with each master cylinder are for use with double flared brake line. Use only double flared lines. Do
not attempt to use single flared connections. Do not use additional sealant or any other type of gaskets on the fittings, lines, or
plugs.
• Connect one of the primary outlet ports (A) to the brakes at the end of the vehicle with the greatest total effective piston bore area.
On most vehicles, this will be the front brake line (see note next page).
• Connect one of the secondary outlet ports (B) to the brakes at the end of the vehicle with the lesser total effective piston bore
area. On most vehicles, this will be the rear brake line (see note next page).
• Use of reinforced flexible lines should be limited to the connection between the fixed chassis and the moving suspension. All other
lines along the fixed chassis should be hard steel lines.
• On four wheel disc brake applications, where the fluid reservoir is mounted higher than the caliper bleed screws, a residual
pressure valve is usually not required.
• On disc brake applications where the fluid reservoir is mounted lower than the caliper bleed screws may require a 2 pound residual
pressure valve. This can prevent fluid drain back and excessive pedal travel on initial engagement.
• All drum brake applications require an inline 10 pound residual pressure valve.
• Use an adjustable proportioning valve to set the front to rear brake bias.
.48 (12,2) DIA
1.21 (30,7) .61 (15,5)
3.22
(81,8)
1
Piston Detail • 1” and 1-1/8”
Bore Master Cylinders Only
3.46 (87,9)
6.81 (173,0)
8.15 (207,0)
.09 (2,3)
2 PL
3.22 (81,8)
4.30 (109,2)
1.61
(40,9)
.33 (8,4) DIA
THROUGH
2 PLACES
SECONDARY
OUTLET "B"
1/2-20 UNF
PRIMARY
OUTLET "A"
1/2-20 UNF
.61 (15,5) 3.50
(88,9)*
6.40 (162,6)
.86 (21,8)
1.01 (25,7)
3/8-24
THREAD*
R .21
(5,3)
3.22
(81,8)
2.50
(63,5)
3.14 (79,8)
1.12
*PUSHROD INCLUDED WITH 7/8" BORE SIZE ONLY
Wilwood Dual Outlet Tandem Chamber Master Cylinder, Mounting Dimensions
REBUILD NOTE:
WILWOOD TANDEM MASTER CYLINDERS ARE NOT USER SERVICEABLE DUE TO THE NECESSITY OF SPECIAL TOOLS FOR
DISASSEMBLY. IN THE EVENT REBUILDING SERVICE IS REQUIRED, PLEASE CONTACT WILWOOD TECHNICAL DEPARTMENT AT
[phone] TO ARRANGE FOR RETURNING MASTER CYLINDER FOR FACTORY REBUILD AND/OR REPAIR AT A NOMINAL COST.