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Balance Bar Adjusting by Scott Gillespie

The balance bar is an adjustable lever (usually a threaded rod), that pivots on a spherical bearing and uses two separate master cylinders for the front and rear brakes. Most balance bars are part of a pedal assembly that also provides a mounting for the master cylinders. When the balance bar is centered, it pushes equally on both master cylinders creating equal pressure, given that the master cylinders are the same size bore. When adjusted as far as possible toward one master cylinder it will push approximately twice as hard on that cylinder as the other.

To set up the balance bar, thread the master cylinder push rods through their respective clevises to obtain the desired position. Threading one push rod into it's respective clevis means threading the other one out the same amount. Sometimes this will lead to a 'cocked' balance bar when the pedal is in the relaxed position, (Fig. 2 'no pedal effort'). This is acceptable as long as each master cylinder push rod is completely free of pressure when the pedal is relaxed.

Balance Bar Adjusting

It is important that the operation of the balance bar functions without interference by over adjustment. This can occur when a clevis jams against the side of the pedal or the lever (bolt) hits the pedal bore during any point of pedal travel (Fig. 3).

Balance Bar Adjusting

Lever movement should be unimpeded throughout pedal travel. In the neutral position, clevises should have between .20" - .25" total clearance between the side of the pedal. The large washers between the pedal and clevis should remain loose. Make sure that the master cylinder push rods remain true in relationship to the cylinder during the entire pedal travel; push rods should not be pushing master cylinder pistons at an angle (Fig. 4).

Balance Bar Adjusting

NOTE: In it's non-depressed position, the pedal and balance bar should allow the push rod of the master cylinders to fully return. This can be checked by feeling push rods for very slight movement, not loose movement. Master cylinder pistons should be against the retaining snap ring (under boot).

This article was published on Friday 25 March, 2011.
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