Hino 600, Workshop Manual, Page: 431 / 451

PARKING BRAKE (BOSCH 12") BR07–3
TROUBLESHOOTING
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*1: Inspect adjuster components to see if any are damaged or jammed.
*2: Inspect the rear pinion seal for leakage that can contaminate the park brake system part. Repair as necessary.
Symptom Possible cause Remedy/Prevention
Light force or lack of resistance
when applying brake lever (on man-
ual apply systems) Shoe cage under-adjusted(*1) Adjust shoes per cage adjustment pro-
cedure.
Worn or deformed actuation compo-
nents (lever, cam lugs shoe ends) Inspect and replace per Anchor Screw,
Lever and Cam.
Replacement procedure or Shoe
Replacement procedure
Maladjusted control linkage Readjust.
Heavy force or excessive resistance
when applying when applying brake
lever (on manual apply system) Over adjusted brake Adjust brake cage clearance diameter.
Apply system over adjusted. Adjust or repair per manufacture’s rec-
ommended procedures.
Brake does not release. Internal damage to brake. Inspect and replace damaged compo-
nents.
Apply cable bound up. Check cable for corrosion, binding,
kinks, or damage.
The parking brake lever in the cab is
binding Check the parking brake lever assem-
bly for damage or corrosion.
Repair or replace as needed.
Brake does not hold vehicle on hill. Grease, oil or other foreign material on
or embedded in shoe linings. Replace shoes and clean drum(*2).
Damaged or incorrect shoes. Replace with correct shoes.
Worn out lining (metal shoe run con-
tacting drum) Replace shoes and resurface or
replace drum as necessary.
Excessive drum runout. Resurface or replace drum per manu-
facturer’s recommended procedure.
Shoe cage under-adjusted. Adjust shoes per primary (or alternate)
Shoe Cage Adjustment procedure.
Worn or deformed actuation compo-
nents (lever, cam lugs, shoe). Inspect and replace per Anchor,
Screw, Lever and Cam.
Replacement procedure