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– Apply pressure to brake pedal until gauge indicates a pres‐
sure of 50 bar.
Important
•
The pressure must not drop by more than 4 bar during the
test period of 45 seconds. Renew brake master cylinder if
drop in pressure exceeds specification.
Tightening torques
♦ ⇒ Rep. gr. 46; Assembly overview – front brake
3.5
Checking wheel brake cylinder for
leaks
Special tools and workshop equipment required
♦ removal wedge -3409-
Removing
– Lift off dust boot -1- using removal wedge -3409- -2-.
– If brake fluid is found in the dust boot, renew wheel brake
cylinder.
Ensure the dust boot is not damaged when lifting off.
ID.4 2021 ➤
Brake system - Edition 07.2021
3. Hydraulic system
83
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