Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 155 Factory Service Manual (1992-1998)54 · Brakes
54 · Brakes

Branding regulator

Make
Alfa Romeo
Model
155 Factory Service Manual
Year
1992–1998
Section
Braking regulator › Branding regulator
BrakesBranding regulator

BRANDING REGULATOR

This is fixed to the half-shell of the rear axle and differs from the traditional type in its system of operation.

Operation

The load acting on the arms of the suspension is measured by the spring (2) which transforms the variations in force applied on the regulator.

During braking, the oil originating from the brake pump enters the regulator, crosses it and moves on to the rear brakes with a pressure which, acting on the grooved plate (6), causes a thrust in the opposite direction to that acting on the operating piston (1).

The operating piston (1) is held in the stop limit position by the combined action of springs (2) and (3), one of which is external and one internal.

When the thrust acting on the grooved plate (6) exceeds that of the opposing force, the operating piston (1) moves towards the left thus interrupting the connection between the brake pump and the rear calipers, causing a jump in pressure at a preset ratio of 0.30.

During operation of the ABS device, when the braking action decreases and the pressure in the rear part of the regulator, acting through the grooving on the inner piston (4) overcomes the reaction of the spring (7), the piston (4) is moved to the left in order to equalize the pressure inside the regulator and keep the pressure peaks constant at the preset ratio of 0.30.

The braking regulator which is functionally integrated with the two sections of the braking circuit (see: BRAKING SYSTEM - DESCRIPTION), continues to operate even if the pressure on one of the two sections is decreased due to breakage of a hose or connection etc.)

Braking regulator schematic showing oil flow from brake pump to rear brakes and internal components including operating piston, springs, pistons, seal ring, grooved plate, and spring for inner piston.
  1. Operating piston
  2. Force exerted by the outer spring on the operating piston
  3. Internal spring
  4. Internal piston
  5. Seal ring
  6. Grooved plate
  7. Spring for inner piston (4)
Pressure separation curve between front and rear brakes. X-axis: 0 to 80, Y-axis: 0 to 60 bar. Four curves are shown: solid line with dots (real curve with driver only), solid line with triangles (real curve with fully loaded vehicle), dashed line with dots (ideal curve with driver only), dashed line with triangles (ideal curve with fully loaded vehicle).

Curve characteristics of the pressure separation between front and rear brakes actuated by the braking regulator

Pa Braking pressure exerted on the front axle

Pp Braking pressure exerted on the rear axle

  • Ideal curve with fully loaded vehicle
  • Real curve with fully loaded vehicle
  • Ideal curve with driver only
  • Real curve with driver only

Parts & tools for this job For 1992 Alfa Romeo 155

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