Check the entire length of the system pipes under the vehicle - they should not be corroded, kinked or pinched. Wet black dirt at the joints indicates a leak. Brake hoses must be flexible.
Wet black dirt on the calipers, bleed nipples and hose connections also indicates a loss of seal.
Check that all bleed nipples have mud guards installed.
Another way to check: with force (approximately 300 N) press the brake pedal. Even after a few minutes, the resistance on it should not weaken. Otherwise, the system is not sealed or the master cylinder is faulty.
[Text republished from the website MercedesMan.ru]
Checking the tightness and serviceability of the brake system (Mercedes-Benz Sprinter 903)
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The article has been verified: Levin Kirill Glebovich
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