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Brake Application With Partial Failure

WARNING: If a fault develops in brake system it is essential that driver has fault investigated immediately.
NOTE: If, during braking, a drastically reduced resistance is detected at pedal and braking effectiveness is very much reduced, failure of non-powered (master cylinder) portion of system is indicated. When this occurs DO NOT pump the brake pedal. Push pedal through free movement to obtain braking effort. For this reason it is essential that brake pedal travel is not obstructed by addition of items such as extra footwell mats.
    WARNING: Foot pressure on pedal, using master cylinder only, will not achieve same degree of braking as that available from power assistance.
  1. When power assistance is not available, ABS braking is not operative. Both warning lights are illuminated. Braking effort is available from master cylinder only. This results in longer pedal travel and greater pedal effort required to decelerate vehicle.
    2. WARNING: Longer pedal travel is required, but power assisted braking is available at a reduced efficiency.
  2. If master cylinder fails, i.e. there is insufficient fluid in master cylinder to create pressure, braking to all 4 wheels is retained and ABS remains operative. The Red warning light will be illuminated if cause of master cylinder failure is a fluid leak and level in master cylinder is low enough to actuate fluid level switch.
    3. WARNING: Brake pedal travel will be greater and extra pedal effort will be required, accompanied by vehicle pulling to one side.
  3. If brake failure occurs due to a fractured brake pipe between a servo unit and a wheel, there will be no pressure in master cylinder. The fluid warning light will be illuminated when level in master cylinder is low enough to actuate fluid level switch. The master cylinder and power valve will operate as for master cylinder failure, BUT, fluid from Power Circuit will push all moving parts in servo cylinder associated with failure to limit of travel. No pressurized fluid passes to those brake pistons served by servo cylinder, but all other pistons in front and rear calipers will be supplied with direct pressure from power valve. The pistons served by other servo cylinder retain braking as fluid from master cylinder is retained in servo cylinder not associated with leakage.
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