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Repairing rear brake caliper > < Removing and installing vacuum pump for brake servo (Diesel vehicles)

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Braking force regulator: checking and adjusting
Braking force regulator: checking and adjusting
Special tools and workshop equipment required
   
t  Brake system tester -V.A.G 1310 A-
Installation position
  W00-0562
The braking force regulator is on a bracket fixed to the rear bearing support, and is controlled from the rear axle by a spring.
Checking function
Floor accelerator pedal quickly and then release (the vehicle sould be stationary on its four wheels). During this procedure the braking force regulator lever should move.
Checking pressure and adjustment
  Note!
The braking force regulator is adjusted with the vehicle at curb weight → Note.
1)  Curb weight is understood as: The weight of the vehicle ready for use (full petrol tank, spare wheel, tools, jack).
–  Raise the vehicle.
–  Fit the pressure gauge of the brake system tester -V.A.G 1310 A- to the brake caliper (front left wheel) and to the brake cylinder (rear right wheel).
–  Bleed both gauges.
–  Lower vehicle and bounce it several times at the rear axle.
–  Apply pressure to brake pedal and measure pressures.
–  Compare measured pressures with the specifications ( → Anchor) and adjust if necessary.
Adjustment values of the braking force regulator
  N47-0024
Pressure
at the front axle		Adjustment value
at the rear axle
70 bar35...41 bar
100 bar48...54 bar

Adjusting braking force regulator
Pressure too high at rear axle:
–  Release regulation spring.
Checking pressure too low in rear axle:
–  Tension regulation spring.
  Note!
Do not adjust with brake pedal depressed, thus the following order should be observed:
Read the values:
–  Release pedal.
–  Adjust regulation spring.
Depress pedal again:
–  Read values and if necessary correct adjustment.
–  Disconnect the pressure gauge and bleed brake sytem → Chapter.
   

Repairing rear brake caliper > < Removing and installing vacuum pump for brake servo (Diesel vehicles)