The brake/clutch master cylinder reservoir is filled with DOT 3 brake fluid as indicated on the reservoir cap. See Engine Compartment Overview for the location of the reservoir.
There are only two reasons why the fluid level in the reservoir might go down:
Do not top off the brake/clutch fluid. Adding fluid does not correct a leak. If fluid is added when the linings are worn, there will be too much fluid when new brake linings are installed. Add or remove brake fluid, as necessary, only when work is done on the brake/clutch hydraulic system.
Warning
If too much brake fluid is added, it can spill on the engine and burn, if the engine is hot enough. You or others could be burned, and the vehicle could be damaged. Add brake fluid only when work is done on the brake/clutch hydraulic system.
When the brake/clutch fluid falls to a low level, the brake warning light comes on. See Brake System Warning Light.
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The front outboard passenger frontal airbag is in the passenger side instrument
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The rear door safety locks prevent passengers from opening the rear doors from
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Manual Safety Locks
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Seat Ibiza. Washer fluid and windscreen wiper blades
Topping up washer fluid
The water for cleaning the windscreen should always be mixed with washer fluid.
Fig. 130 In the engine compartment: Cap of windscreen washer fluid reservoir.
The wi ...