Owner's manual

Wilwood • Phone 805 / 388-1188 • Fax 805 / 388-4938 • www.wilwood.com
E-mail Technical Assistance: [e-mail]
Tandem Master Cylinders
Part No. Description Part No. Description
260-9439 7/8” Bore M/C - Standard Finish 260-8556 1-1/8” Bore M/C - Standard Finish
260-9439-P 7/8” Bore M/C - Bright Finish 260-8556-P 1-1/8” Bore M/C - Bright Finish
260-9439-BK 7/8” Bore M/C - Black Finish 260-8556-BK 1-1/8” Bore M/C - Black Finish
260-8555 1” Bore M/C - Standard Finish
260-8555-P 1” Bore M/C - Bright Finish
260-8555-BK 1” Bore M/C - Black Finish
Components and Accessories
Part No. Description Part No. Description
260-1874 2 PSI Residual Pressure Valve 290-0632 Wilwood Hi-Temp 570 DOT 3 Fluid
260-1876 10 PSI Residual Pressure Valve 290-6209 Wilwood EXP 600 Plus Super Hi-Temp Fluid
260-8419 Knob Adjustable Proportioning Valve
260-8420 Lever Adjustable Proportioning Valve
• Make sure pedal is firm: Hold firm pressure on pedal for several minutes, it should remain in position without
sinking. If pedal sinks toward floor, check system for fluid leaks. DO NOT drive vehicle if pedal does not stay firm
or can be pushed to the floor with normal pressure.
• At very low speed (2-5 mph) apply brakes hard several times while turning steering from full left to full right, repeat
several times. Remove the wheels and check that components are not touching, rubbing, or leaking.
• Carefully examine all brake components, brake lines, and fittings for leaks and interference.
• Make sure there is no interference with wheels or suspension components.
• Drive vehicle at low speed (15-20 mph) making moderate and hard stops. Brakes should feel normal and
positive. Again check for leaks and interference.
• Always test vehicle in a safe place where there is no danger to (or from) other people or vehicles.
• Always wear seat belts and make use of all safety equipment.
WARNING • DO NOT DRIVE ON UNTESTED BRAKES
BRAKES MUST BE TESTED AFTER INSTALLATION OR MAINTENANCE
MINIMUM TEST PROCEDURE
CALCULATING EFFECTIVE PISTON BORE AREA TO DETERMINE PLUMBING
To determine the effective piston bore area of any caliper, you must first calculate the area for each piston bore found on one
side of the caliper. Use the formula " Area = (bore x bore) x .785" for each piston bore size. Then, add the areas of all pistons
on that one side of the caliper to determine the total effective piston bore area. Compare the difference between the front and
rear calipers and attach the line from the primary outlet "A" to the calipers at the end of the vehicle with the greater total
effective piston bore area.