Hello,
Is the brake master cylinder leaking externally? can you see any brake fluid outside at the brake master cylinder? Or is the brake fluid level dropping in the reservoir without any visible external leaks?
If the 2nd scenario is applicable you need to check the brakes lines and callipers/drums at the wheels first for any possible leakage, please see pictures below.
If no leaks are visible at the wheels then I would suggest to remove your brake master cylinder. Check for any leakage at the rear of the brake master cylinder. See picture below. Also check for any traces of brake fluid in the brake booster. If any brake fluid is found in the brake booster this should be drained out. Best practice is to replace the brake booster as the brake fluid will cause the rubber diaphragm to perish and eventually fail.
How to replace a brake master cylinder see instructions below.
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
and bleed brakes
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
Please let us know how you get along.
Cheers, Boris
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Friday, April 23rd, 2021 AT 3:32 AM