286
4 Excessively long brake pedal stroke Likely Causes
[Description]
Visually inspect whether there
is leakage or mechanical fault. Use bleeding
method to check whether there is air in the
system. Use the HCU function of the scan
meter to test whether the normally-closed valve
is leaking.
 Brake fluid leakage
 Air in the system
 Brake disc severely worn
 Brake fluid level switch faulty
Tighten the pipe connector as
specified
Visually inspect whether the hydraulic pipe connector is
leaking
Check the brake disc wear
Replace the brake disc
Abn.
Ok
Abn.
Check the brake fluid level switch
Ok
Bleed and check
Ok
Use the scan meter HCU to diagnose and check the nor-
mally-closed valve seal
Ok
Replace the brake fluid level
switch
Abn.
Re-bleed the system
Abn.
Replace the HCU
Abn.