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5 -12
BRAKES =
SERVICE PROCEDURES
BRAKE FLUID LEVEL
Always clean the master cylinder reservoir and cap
before adding fluid. This will prevent dirt from fall-
ing in the reservoir and contaminating the brake
fluid.
The reservoir has a ADD and a FULL mark on the
side (Fig . 12) fill to the FULL mark.
Fig. 12
Master Cylinder
Fluid
Level
MASTER CYLINDER
A new master cylinder should be bled before instal-
lation on the vehicle. Required bleeding tools include
bleed tubes and a wood dowel to stroke the pistons.
Bleed tubes can be fabricated from brake line .
BLEEDING PROCEDURE
(1)
Mount master cylinder in vise .
(2) Attach bleed tubes to cylinder outlet ports.
Then position each tube end in matching reservoir
fluid compartment (Fig . 13).
NOTE: If master cylinders has one reservoir open-
ing, position both outlet bleed tubes into the single
reservoir opening.
(3)
Fill reservoir with fresh brake fluid.
(4) Press cylinder pistons inward with wood dowel.
Then release pistons and allow there to return under
spring pressure . Continue bleeding operations until
air bubbles are no longer visible
in
fluid.
BRAKE BLEEDING
Use Mopar brake fluid, or an equivalent quality
fluid meeting SAE J1703-F and DOT 3 standards
only. Use fresh, clean fluid from a sealed container at
all times.
Do not pump the
bleeding. Air in the
small bubbles that
brake pedal at any time while
system will be compressed into
are distributed throughout the
TJ
BLEEDING
RH232
TUBES
HOUSING
DOWEL
MASTER CYLINDER
Fig. 13 Master Cylinder Bleeding
hydraulic. system . This will make additional bleeding
operations necessary.
Do not allow the master cylinder to run out of fluid
during bleed operations . An empty cylinder will allow
additional air to be drawn into the system . Check the
cylinder fluid level frequently and add fluid as
needed.
The Brakes should be bled in sequence . First the
right rear wheel then the left rear wheel . Then move
to the front brakes and bleed the right front wheel
then the left front wheel.
MANUAL BLEEDING
(1)
Remove reservoir filler caps and fill reservoir
with Mopar, or equivalent quality DOT 3 brake fluid.
(2) If calipers, or wheel cylinders were overhauled,
open all caliper and wheel cylinder bleed screws .
Then close each bleed screw as fluid starts to drip
from it. Top off master cylinder reservoir once more
before proceeding.
(3) Attach one end of bleed hose to bleed screw
and insert opposite end in glass container partially
filled with brake fluid (Fig. 14). Be sure end of bleed
hose is immersed in fluid.
(4) Open up bleeder, then have a helper press
down the brake pedal. Once the pedal is down close
the bleeder. Repeat bleeding until fluid stream is
clear and free of bubbles. Then move to the next
wheel.
DISC ROTOR MACHINING
Rotor braking surfaces can be sanded or machining
in a disc brake lathe.
The lathe must machine both sides of the rotor
simultaneously with dual (two) cutter heads (Fig.
15). Equipment capable of machining only one side at
a time will produce a tapered rotor.
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