Brake fluid leak?

[bail]

Brake fluid keeps on decreasing despite of no visible leak. My brake pads and drum shoes are all new. What could be the problem?
Corolla 1997 gli 1.6 here.

[sirkosero]

Brake fluid in thr brake master is leaking to the hydrovac (brake booster)

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[bail]

Brake fluid in thr brake master is leaking to the hydrovac (brake booster)

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Will this be a costly repair?

[sirkosero]

Will this be a costly repair?

Depends. If repair kit is possible, that would cost you around 1k. If not, prepare a few thousands.

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[pdspd]

Check for fluid leak on flooring under the brake pedal.Maybe the fluid leaks inside (pushod connecting the brake pedal and the brake master cylinder).

[mina_nuka]

If your exhaust fumes smell sweet and your spark plugs are glazed, it indeed is leaking brake fluid past the master cylinder to the vacuum brake booster and into the intake manifold.