940 L4-2.3L SOHC VIN 88 B230F (1992)
The Brake Caliper Is Available In Three Main Versions:
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two-piston caliper for solid brake disc (aluminium housing)
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two-piston caliper for ventilated brake disc
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single-piston caliper for ventilated brake disc
Although the calipers differ in external appearance, the principle of operation is the same in all cases.
The illustration shows a two-piston caliper for a ventilated brake disc.
The caliper is of the sliding type and consists of two main components, the caliper proper (1 ) and the retainer (2).
The caliper moves in the retainer on two greased guide pins (4), which are protected by rubber gaiters (3). The braking force exerted by the pads (5) is
accommodated by the retainer, which transfers the force to the spindle. The caliper houses two pistons (8) with fluid seals (10) and a dust seal.
The functions of the fluid seals are to prevent the escape of brake fluid and to return the pistons to the idle position after braking. Each seal is square
in section and is pressed against the piston by the slightly angled groove in the housing. The dust seal prevents the entry of dirt between the cylinder
and piston.
The piston force is exerted directly on the adjoining pad and through the retainer to the opposite pad.
