V70 GL L5-2.4L VIN 55 B5254S (1998)
Cars fitted with TRACS have a different hydraulic unit. The difference is that:
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The brake pipe (1) between the master cylinder primary circuit and the hydraulic unit is larger in diameter. This gives the brake fluid pipe more
capacity and ensures that the hydraulic pump has sufficient brake fluid when using TRACS.
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The valve block has an extra inlet valve (2) (TRACS inlet valve) which closes the connection between the hydraulic pump and master cylinder
primary circuit when TRACS is activated. The valve is electrically operated and is normally open.
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The valve block has an extra hydraulic valve (3) (TRACS valve) which closes the connection between the master cylinder primary circuit and the
hydraulic pump inlet side when the brake pedal is depressed and pressure builds up in the primary circuit. The valve is hydraulically operated and
normally open.
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he valve block has an overflow valve (4). If the hydraulic pump supplies more brake fluid than is normally required for control purposes, the
excess brake fluid is fed back to the hydraulic pump inlet side via the overflow valve. The valve block has an overflow valve (4). If the hydraulic
pump supplies more brake fluid than is normally required for control purposes, the excess brake fluid is fed back to the hydraulic pump inlet side
via the overflow valve. The overflow valve also controls the maximum pressure in the system under TRACS control.
