YH4
GRAND
VITARA
FRONT BRAKE 5B-7
2) Remove piston seal using a thin blade like a thickness gauge,
etc.
CAUTION:
Be careful not to damage inside (bore side) of cylinder.
INSPECTION
Cylinder Boot
Check boots for breakage, crack and damage. If defective, replace.
Piston Seal
Excessive or uneven wear of pad lining may indicate unsmooth re-
turn of the piston. In such a case, replace rubber seal.
ASSEMBLY
Reassemble front brake in reverse order of disassembly, noting the
following points.
CAUTION:
Wash each part cleanly before installation in the same
fluid as the one used in master cylinder reservoir.
Never use other fluid or thinner.
Before installing piston and piston seal to cylinder, apply
fluid to them.
After reassembling brake lines, bleed air from them.
Piston Seal
Piston seal is used to seal piston and cylinder and to adjust clear-
ance between pad and disc. Replace with a new one at every over-
haul. Fit piston seal into groove in cylinder taking care not to twist
it.
YH4
GRAND
VITARA
7B1-30 AUTOMATIC TRANSMISSION (4 A / T)
Running condition Gear shift Abnormal
noise
ConditionPossible CauseCorrection
Poor 1st speed run-
ning or excessive
slippage in ªDº or ª2ºFluid pressure leakage from forward clutch
due to wear or breakage of O/D case seal
ringReplace.
Overdrive clutch slippingReplace.
Unable to run or ex-
cessive slippage in
ªLº rangeFluid pressure leakage of forward clutch
due to wear or breakage of O/D case seal
ringReplace.
Reverse brake disc slippingReplace.
Broken brake piston O-ringReplace.
Unable to run or ex-
cessive slippage in
ªRº rangeFluid pressure leakage to direct clutch due
to wear or breakage of center support seal
ringReplace.
Worn direct clutchReplace.
Poor 1±2 shift, ex-
cessive slippageFluid pressure leakage to overdrive clutch
due to wear or breakage of O/D case seal
ringReplace.
Faulty second brakeReplace.
Broken O-ring of second brake pistonReplace.
Faulty second coast brake (in ª2º range)Replace.
Poor 2±3 shift, ex-
cessive slippageFluid pressure leakage to overdrive clutch
due to wear or breakage of O/D case seal
ringReplace.
Worn direct clutch bushingReplace.
Direct clutch slippingReplace.
Foreign material caught in direct clutch pis-
ton check ballReplace.
Poor start or surging
in ªDº rangeFluid pressure leakage of forward clutch
due to wear or breakage of O/D case seal
ringReplace.
Malfunction of forward clutchReplace.
Poor 3±4 shift, ex-
ili
Faulty overdrive brakeReplace.
cessive slippageFaulty overdrive clutchReplace.
Poor start or judder-
ing in ªRº rangeFluid pressure leakage of direct clutch due
to wear or breakage of oil center support
seal ringReplace.
Worn direct clutchReplace.
Excessive shock on
1± 2 shiftFaulty one-way clutchReplace.
Non operate lock-up
systemFaulty torque converterReplace.
Abnormal noise in
ªPº or ªNº rangeWorn oil pumpReplace.
SCAN TOOL DATA-Refer to SECTION 6 / 6-1.
INSPECTION OF PCM AND ITS CIRCUIT-Refer to SECTION 6 / 6-1.
WIRE HARNESS AND CONNECTORS-Refer to SECTION 6 / 6-1.
