Celica 2WD L4-2.0L (3S-FE) (1988)
b. Check that the valve does not leak by applying low-pressure compressed air.
2. INSPECT DISC, PLATE AND FLANGE
Check that the sliding surface of disc is not worn or burnt.
If the disc is worn or burnt, replace all discs.
Then check that the sliding surfaces of plate and flange are not worn or burnt.
If necessary, replace them.