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Load dependent brake pressure regulator specifications > < Fluid tightness under pressure: checking
Checking and adjusting brake pressure regulator
Checking and adjusting brake pressure regulator
Special tools and workshop equipment required
   
t  Brake system test unit -V.A.G 1310 A-
  W00-0562
The brake pressure regulator is mounted on a bracket which is in turn fixed to a rear axle mounting bracket and is controlled from the rear axle by a spring.
Checking operation
Firmly depress the brake pedal and release quickly (vehicle standing on its wheels). This must cause the brake pressure regulator lever to move.
Checking and adjusting pressure
  Note!
The brake pressure regulator is set with the vehicle unladened → Note.
–  Lift vehicle and connect the pressure gauges to front left brake caliper and to the rear right wheel cylinder.
–  Bleed both gauges.
1)  The term “unladen” means: The weight of the vehicle ready for the road (full fuel tank, spare wheel, tool kit and jack).
–  Lower vehicle and bounce the rear of the vehicle several times.
–  Depress brake pedal and measure pressures.
–  Compare figures attained with specifications → Chapter and if necessary adjust.
Adjusting regulator
Rear axle test pressure too high:
–  Release regulator spring.
Rear axle test pressures too low:
–  Tension regulator spring.
  Note!
Do not adjust with brake pedal depressed, therefore observe the following sequence:
–  Read off figures.
–  Release pedal.
–  Adjust spring.
–  Depress pedal again.
–  Read off figures and if necessary, readjust.
–  Remove pressure gauges and bleed brake system → Chapter.
  N47-0024

Load dependent brake pressure regulator specifications > < Fluid tightness under pressure: checking