Tire Rotation; Brake Check; Disc Brakes; Drum Brakes - Jeep cherokee 1989 Owner's Manual

1-20
19.2 The recommended tire rotation patterns for these vehicles

1 9 Tire rotation

Refer to illustration 19.2
1 The tires should be rotated at the specified intervals and whenever
uneven wear is noticed.
2 Refer to the accompanying illustration for the preferred tire rotation
pattern.
3 Refer t o the information in Jackingand towing at the front of this
manual for the proper procedures to follow when raising the vehicle
and changing a tire. If the brakes are to be checked, don't apply the
parking brake as stated. Make sure the tires are blocked to prevent
the vehicle from rolling as it's raised.
4 Preferably, the entire vehicle should be raised at the same time.
This can be done on a hoist or by jacking up each corner and then lower-
ing the vehicle onto jackstands placed under the frame rails. Always
use four jackstands and make sure the vehicle is safely supported.
5 After rotation, check and adjust the tire pressures as necessary
and be sure to check the lug nut tightness.
6 For additional information on the wheels and tires, refer to Chap-
ter 10.

2 0 Brake check

Refer to illustrations 20.6, 20. 12 and 20. 14
Note: For detailedphotographs of the brake system, refer to Chapter
Warning: Brake system dust may contain asbestos, which is hazardous
to your health. DO NOT blow it out with compressed air and DO NOT
inhale it. DO NOT use gasoline or solvents to remove the dust. Use
brake system cleaner or denatured alcohol only.
Caution: On ABS-equipped vehicles, be careful when working in the
vicinity of the brake sensing components,
1 In addition to the specified intervals, the brakes should be inspected
every time the wheels are removed or whenever a defect is suspected.
2 To check the brakes, raise the vehicle and place it securely on
jackstands. Remove the wheels (see Jacking and towing at the front
of the manual, if necessary).

Disc brakes

3
Disc brakes are used on the front wheels. Extensive rotor damage
can occur if the pads are not replaced when needed.
4 These vehicles are equipped with a wear sensor attached to the
inner pad. This is a small, bent piece of metal which is visible from
the inner side of the brake caliper. When the pad wears to the specified
limit, the metal sensor rubs against the rotor and makes a squealing
sound.
The Motor Manual Guy
Chapter 1 Tune-up and routine maintenance
9.
20.6 You will find an inspection hole like this i n each
caliper placing a steel ruler across the window should
enable you t o determine the thickness of remaining pad
material for both inner and outer pads
5
The disc brake calipers, which contain the pads, are visible with
the wheels removed. There is an outer pad and an inner pad in each
caliper. All pads should be inspected.
6 Each caliper has an inspection hole to inspect the pads. Check the
thickness of the pad lining by looking into the caliper at each end and
down through the inspection hole at the top of the housing (seeillustra-
has worn to about 118-inch or less, the pads should be replaced.
7
If you're unsure about the exact thickness of the remaining lining
material, remove the pads for further inspection or replacement (refer
to Chapter 9).
8 Before installing the wheels, check for leakage and/or damage
(cracks, splitting, etc.) around the brake hose connections. Replace
the hose or fittings as necessary, referring to Chapter 9.
9 Check the condition of the rotor. Look for score marks, deep
scratches and burned spots. If any of these conditions exist, the
hublrotor assembly should be removed for servicing (see Section 38
for 2WD vehicles or Chapter 9 for 4WD vehicles).

Drum brakes

10 On rear brakes, remove the drum by pulling it off the axle and brake
assembly (see Chapter 9).
11 With the drum removed, do not touch any brake dust (see the
Warning at the beginning of this Section).
12 Note the thickness of the lining material on both the front and rear
brake shoes. If the material has worn away t o within I 11 6-inch of the
recessed rivets or metal backing, the shoes should be replaced (see
illustration). The shoes should also be replaced if they're cracked,
20.12 The lining thickness of the rear brake shoe is measured
from the outer surface of the lining to the metal shoe