Wilwood MasterCylinder No: 260-11179 - Manual (Page 2)

• 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
Switch Connections: If your vehicle is already equipped with a brake light
switch on the brake pedal, the switch in the combination valve does not
need to be used, and it may be removed. Plug the unused port with a
1/8-27 NPT pipe plug (not included). For all other applications, or if you wish
to eliminate the switch on the brake pedal, use the switch in the
proportioning valve block.
1. Before connecting the lead wires, cut the ends (that do not have the
clip) on a 45° angle. Coat both cut ends with Dielectric Grease to ease
sliding the wires through the holes in the dust boot. Slide the clips onto
the spade connectors and cover with the dust boot.
2. Connect one lead of the brake light pressure switch to a 12 volt, 15 amp
fused circuit. This should be a battery direct, always hot circuit. Do not
use an ignition key switch activated circuit.
3. Connect the other pressure switch wire to the lead wire going to the
brake lights.
4. Be sure the brake lights are properly grounded, and all connections are
secure and insulated.
Fluid: The Wilwood proportioning valve block is fully compatible with all
types of brake fluid including DOT 3, 4, 5, and 5.1 fluids. DOT 3, 4 and 5.1
fluids are fully miscible, but DOT 5 silicone fluid should never be mixed with
any other fluids. Always follow the vehicle manufacturers fluid recommendations for any vehicle. A complete flush and fill with fresh fluid is recommended for
all installations. For best performance, use Wilwood Hi-Temp 570, EXP 600 Plus, or Wilwood FIVE DOT 5 high performance fluids.
Bleeding: To properly bleed the brake system, begin with the caliper farthest from the master cylinder. For fixed mount calipers with two bleed screws on top,
bleed the outboard bleed screw first, then bleed the inboard screw. Repeat this procedure until all calipers have been bled, ending with the caliper closest to
the master cylinder. Once the system has been bled, the pedal should maintain a consistent, firm feel. If the pedal returns to a spongy feel after it has rested
from the bleeding process, this is an indication that air still exists in the system. If this occurs, repeat the bleeding process until all air has been purged and the
pedal retains a firm feel. NOTE: When installing a new master cylinder, it is important to follow proper bench bleeding procedures. Follow the installation
instructions provided with the new master cylinder. If a firm pedal can not be achieved after bleeding the system, the master cylinder may not be properly sized
for the brake system.
Proportioning Valve Adjustment: The proportioning valve is used to adjust the rate of increase in rear brake line pressure, relative and proportionate to the
increase in front brake line pressure. For safety and performance, the rear brakes should never lock before the front brakes. Otherwise, an out of control situation
could occur.
1. Begin with the valve in the full proportioned (least pressure) position by turning the knob all the way out (counter-clockwise rotation).
2. In a safe location, make several hard stops from 30 MPH observing the function of the rear brakes. If the rear brakes do not lock up before the front, gradually
increase the rear line pressure by rotating the valve clockwise (two turns each time).
3. Continue these adjustments until the maximum amount of rear brake pressure can be achieved, and no wheel rear lock is observed.
4. Test the vehicle again at 50 MPH and make any additional adjustments as needed.
Help: If after following the instructions, you still have difficulty with installing, bleeding, or adjusting your Wilwood Combination Proportioning Valve, consult your
chassis builder, the retailer where the valve was purchased, a qualified brake technician, or Wilwood Customer Service at (805) 388-1188.
4.43
(112,4)
.35 (8,8)
THRU
2 PLACES PRESSURE
SWITCH
1/8-27 NPT
-3 INVERTED
FLARE
5 PLACES
1.37
(34,7)
1.00
(25,4)
.79 (20,0)
.91
(23,2)
.96
(24,4)
.93
(23,5)
1.25 (31,8)
.46
(11,6)
2.25 (57,1)
3.58 (90,8)
4.94 (125,3)
1.30 (33,0)
2 PLACES
.35
(8,9)
1.02
(25,8)
1.10
(27,8)
Figure 1. Combination Proportioning Valve, Knob Style,
Mounting Dimensions