Dodge D150 1990 Service Manual page 249

5 - 40 BRAKES •
ROTOR RUNOUT
Check rotor l a t e r a l r u n o u t w i t h a d i a l indicator C-
3339 (Fig. 17). Excessive lateral r u n o u t w i l l cause
brake pedal p u l s a t i o n and rapid, uneven wear o f the
brakeshoes. position t h e dial indicator plunger ap-
p r o x i m a t e l y 25.4 m m (one inch) i n from the rotor
edge. B e s u r e w h e e l b e a r i n g e n d p l a y i s r e d u c e d
t o z e r o b e f o r e c h e c k i n g r u n o u t . M a x i m u m allow-
able r u n o u t is .127 m m (.005 inch).
Fig. 17 Checking Rotor Runout And Thickness
Variation
ROTOR REFINISHING
Rotor b r a k i n g surfaces can be refinished b y sand-
i n g and/or m a c h i n i n g i n a disc brake lathe. The lathe
must be capable of m a c h i n i n g both rotor surfaces si-
multaneously w i t h d u a l cutter heads. Equipment ca-
pable o f m a c h i n i n g only one side a t a t i m e w i l l
produce a tapered rotor. The lathe should also be
equipped w i t h a grinder attachment or dual sanding
discs for f i n a l cleanup or l i g h t refinishing.
I f the rotor surfaces only need minor cleanup of
rust, scale, or scoring, use abrasive discs to clean up
the rotor surfaces. However, when a rotor is scored or
w o r n , m a c h i n i n g w i t h c u t t i n g tools w i l l be required.
CAUTION: Do not refinish a rotor if machining
would cause the rotor to fall below minimum allow-
able thickness.
ROTOR REMOVAL
(1) Block b r a k e pedal i n released (up) position.
(2) Raise vehicle to a comfortable w o r k i n g height
and support w i t h jack stands.
(3) Remove wheel and t i r e assembly.
(4) Remove support key r e t a i n i n g screw (Fig. 6).
(5) Remove caliper support key and s p r i n g w i t h p i n
p u n c h or d r i f t (Fig. 18).
Fig. 18 Removing Caliper Support Key And Spring
(6) Remove caliper a n d brakeshoes f r o m adapter.
D o n o t a l l o w b r a k e hose to s u p p o r t c a l i p e r
weight. S u p p o r t c a l i p e r o n stool, o r s e c u r e c a l i -
p e r to n e a r b y frame o r c h a s s i s c o m p o n e n t w i t h
w i r e .
(7) Remove h u b cap.
(8) Remove drive flange snap r i n g w i t h tool C-4020
(Fig. 19).
Fig. 19 Removing Drive Flange Snap Ring
(9) Remove flange nuts and lockwashers and r e -
move drive flange. Discard the flange gasket.
(10) S t r a i g h t e n t a n g on lockring.
(11) Loosen outer locknut and adjusting n u t w i t h
tool DD-1241-JD (Fig. 18). Then remove outer lock-
n u t , lock r i n g , inner adjusting n u t and outer bearing.
(12) Remove h u b and rotor from spindle.
(13) Remove seal and inner bearing from h u b i f
bearings or seal require service.