2. To check the action of the regulator, press then quickly release the brake pedal. If the vehicle is on suspension, the governor lever should move, indicating that the block is not stuck.
3. To check for leaks from the regulator, connect pressure gauges to the left front caliper and right rear brake master cylinder or caliper. Since special equipment is usually not available to a home mechanic, this work should be left to an Audi dealer. However, the outline of the procedure is as follows. Depress the brake pedal so that the pressure in the left front caliper is 100 bar. Fix this pressure for five seconds and check that the pressure in the right rear working brake cylinder or caliper does not differ by more than 10 bar.
4. Note that over time it is possible for a small amount of brake fluid to seep out of the regulator outlet.
5. Before adjusting the regulator, unscrew the nut, disconnect the control spring and remove the plastic roller from the adjustment bolt (photo). Clean the bushing, apply grease to it, then install the roller, nut and spring without tightening the nut.
6. Vehicle must be at normal net weight and rear suspension at normal height. Shake the rear of the car a few times to adjust the suspension.
7. Push the governor lever all the way back until it rests against the stop.
8. On Audi 90 models, place a 1.0mm bit between the hooked end of the spring and the plastic roller. On Coupe models, use a 7.0 mm drill bit.
9. Move the adjustment bolt so that all slack in the coil spring is removed, but do not stretch it, then tighten and lock the nut.
10. Remove the drill, push the spring fully onto the plastic roller.
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