Chery automobile Service Manual page 318

-- Measure the thickness of friction lining, as shown
in the figure.
Caution: The service limit is 2 mm.
-- Check the contact between the friction lining of
brake and the brake drum, as shown in the figure.
MAINTENANCE OF BRAKE WHEEL CYLINDER
-- Check the oil leakage of brake wheel cylinder, and
the damage of dust boot.
-- Detach the brake wheel cylinder, and check
whether there are some scores on piston or
cylinder wall, whether the spring is broken, and
whether the oil seal is damaged. Replace the brake
wheel cylinder if any of the above is found.
MAINTENANCE OF SPRING
-- Check the breakage, deformation or elastics
weakening of the spring, and replace it, if any.
P-14