Wilwood High Volume Master Cylinder - Manual

INSTALLATION AND BLEEDING
INSTRUCTIONS
WILWOOD HIGH VOLUME ALUMINUM MASTER CYLINDERS
4700 Calle Bolero • Camarillo, CA 93012 Phone 805 / 388-1188 • Fax 805 / 388-4938
Before installation of the Wilwood High Volume Aluminum Master Cylinder, read these instructions carefully to familiarize
yourself with the procedure before you begin. Also, for your reference (on the reverse side of this sheet) is an exploded view
of the High Volume Aluminum Master Cylinder. NOTE: Wilwood High Volume Aluminum Master Cylinders should be bench
bled before installation in the chassis.
PROCEDURE:
•Install an appropriate pipe thread to flare adapter fitting (not supplied) in the 1/8 inch NPT master cylinder outlet hole using
PFTE thread tape sealant.
•Bench bleeding: Bolt the cylinder to a pedal bracket or gently hold it in a vise. Remove the reservoir cap. Fill the reservoir
approximately 2/3 full with Wilwood Hi-Temp° 570 brake fluid (P/N 290-0632), or for severe braking or sustained high heat
operation, use Wilwood EXP 600 Plus Racing Brake Fluid (P/N 290-6209). WARNING: DOT 5 silicone brake fluid is NOT
recommended for racing or performance driving , use only DOT 3, DOT 4 or DOT 5.1 brake fluid. Firmly push the
cylinder rod all the way down and place a finger over the outlet fitting. Let the rod return all the way before removing the
finger from the outlet hole. Repeat the process until all the fluid coming from the outlet is bubble free. Be sure to watch the
fluid level in the reservoir. If the reservoir is less than 1/3 full, add fluid before further bleeding. Temporarily plug the outlet
fitting and install the reservoir cap.
•Alternative bench bleeding method: Temporarily install a pipe thread to tubing fitting and clear plastic return line (not
supplied) back to the reservoir. Slowly pump and return master cylinder piston throughout its full stroke until no bubbles
return to the reservoir. Disconnect tubing and fitting while temporarily plugging the outlet fitting, then install reservoir cap.
•Install the master cylinder in the chassis. Connect the brake line being careful not to let air into the outlet fitting. Thread the
push rod into the pedal clevis. Remove the reservoir cap and bleed the brake system as normal. Be sure to refill the
reservoir if the fluid level falls below 1/3 full. If a power bleeder is used, follow the manufacturer’s instructions.
BLEED THE SYSTEM:
•To properly bleed the brake system, begin with the caliper farthest from the master cylinder. Bleed the outboard bleed screw
first, then the inboard. Repeat the procedure until all calipers in the system are bled, ending with the caliper closest to the
master cylinder.
DS-412H REV DATE: 06-27-12
Part numbers applicable to this procedure:
Description Part No. Rebuild Kit Part No.
1 inch bore 260-6766 260-6900
7/8 inch bore 260-6765 260-6899
3/4 inch bore 260-6764 260-6898
WARNING
IT IS THE RESPONSIBILITY OF THE PERSON INSTALLING ANY BRAKE COMPONENT OR KIT TO DETERMINE THE SUITABILITY OF THE
COMPONENT OR KIT FOR THAT PARTICULAR APPLICATION. IF YOU ARE NOT SURE HOW TO SAFELY USE THIS BRAKE COMPONENT OR
KIT, YOU SHOULD NOT INSTALL OR USE IT. DO NOT ASSUME ANYTHING. IMPROPERLY INSTALLED OR MAINTAINED BRAKES ARE
DANGEROUS. IF YOU ARE NOT SURE, GET HELP OR RETURN THE PRODUCT. YOU MAY OBTAIN ADDITIONAL INFORMATION AND
TECHNICAL SUPPORT BY CALLING WILWOOD AT (805) 388-1188, OR VISIT OUR WEB SITE AT WWW.WILWOOD.COM. USE OF WILWOOD
TECHNICAL SUPPORT DOES NOT GUARANTEE PROPER INSTALLATION. YOU, OR THE PERSON WHO DOES THE INSTALLATION MUST
KNOW HOW TO PROPERLY USE THIS PRODUCT. IT IS NOT POSSIBLE OVER THE PHONE TO UNDERSTAND OR FORESEE ALL THE ISSUES
THAT MIGHT ARISE IN YOUR INSTALLATION.
RACING EQUIPMENT AND BRAKES MUST BE MAINTAINED AND SHOULD BE CHECKED REGULARLY FOR FATIGUE, DAMAGE, AND WEAR.