Owner's manual

ManualsBrandsWilwood ManualsFor bicyclesAluminum Tandem Master Cylinder

4700 Calle Bolero • Camarillo, CA 93012 Phone 805 / 388-1188 • Fax 805 / 388-4938

Installation Notes and Precautions

• Check the length and diameter of the push rod

from the pedal or power booster. It should fully

engage the bottom of the recess in the master

cylinder piston assembly without interference

along the sides or shoulders. For short push

rod power brake boosters, use the spacer

supplied to reduce the overall depth of the

piston recess. The piston detail diagram on

page 2 illustrates the overall depth and

diameter of the push-rod recess.

• When the pedal is released, the piston

assembly must fully return to the snap-ring

retainer at the end of the cylinder bore.

Consequently, the push rod must be long

enough to remain captured inside the piston

recess when the pedal is fully retracted. Adjust

the length of the push rod and available pedal

travel as necessary. Return springs and pedal

stops are always recommended.

WARNING

THIS COMPONENT IS DESIGNED FOR USE IN CUSTOM BRAKE SYSTEMS ON PERFORMANCE, RACING, AND OTHER SPECIAL

PURPOSE BUILT OFF-ROAD VEHICLES. IT IS NOT INTENDED AS A DIRECT REPLACEMENT FOR ANY OEM APPLICATION.

DS-487F REV DATE 01-24-11

ALUMINUM TANDEM MASTER CYLINDER

SPECIFICATION SHEET • INSTRUCTIONS

Master Cylinder Part Numbers

260-8555/-P/-BK

260-8556/-P/-BK

260-9439/-P/-BK

Component Specifications

Piston / Bore Diameter 7/8, 1 and 1-1/8 inches

Piston Stroke / Push Rod Travel 1.10 inches

Volume Output Ratio (A/B) 2:1

Pressure Output Ratio (A/B) 50 / 50

Reservoir Capacity: Primary (A) 13.93 Cubic inches

Secondary (B) 8.43 Cubic inches

Bright Finish Shown

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.

Typical Bleeder Tube Setup and Use

PRESS IN AND

RELEASE

SEVERAL TIMES

BLEEDER TUBES

*Diagram Depicts 7/8” Bore Size with Pushrod

www.wilwood.com

Summary of content (3 pages)

PAGE 1
www.wilwood.com ALUMINUM TANDEM MASTER CYLINDER SPECIFICATION SHEET • INSTRUCTIONS Master Cylinder Part Numbers 260-8555/-P/-BK 260-8556/-P/-BK 260-9439/-P/-BK Component Piston / Bore Diameter Piston Stroke / Push Rod Travel Volume Output Ratio (A/B) Pressure Output Ratio (A/B) Reservoir Capacity: Primary (A) Secondary (B) Bright Finish Shown Specifications 7/8, 1 and 1-1/8 inches 1.10 inches 2:1 50 / 50 13.93 Cubic inches 8.
PAGE 2
• 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. 6.40 (162,6) .33 (8,4) DIA THROUGH 2 PLACES 3.14 (79,8) 1.01 (25,7) 3/8-24 THREAD* 3.22 (81,8) R .21 (5,3) .86 (21,8) 1.12 2.50 • Prior (63,5) to attaching the fluid lines, fill the PRIMARY SECONDARY OUTLET "A" OUTLET "B" .61 (15,5) 3.50 reservoirs with Wilwood fluid from a new, 1/2-20 UNF 1/2-20 UNF 1.
PAGE 3
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.