Brake Pad: Testing and Inspection
Front Brake Disc and Pad InspectionReference: Front Disc Brake Pad Removal and Installation
Brake Pad
Check pad lining for wear. When wear exceeds limit, replace with new one.
CAUTION:
Never polish pad lining with sandpaper. If lining is polished with sandpaper, hard particles of sandpaper will be deposited in lining and may damage disc. When pad lining requires correction, replace it with a new one.
NOTE:
When pads are removed, visually inspect caliper for brake fluid leak. Correct leaky point, if any.
Front disc brake pad thickness (lining thickness)
Standard: 11.0 mm (0.43 inch)
Limit: 2.0 mm (0.08 inch)
Brake Disc
Before this inspection, brake pads must be removed.
Check disc surface for scratches in wearing parts. Scratches on disc surface noticed at the time of specified inspection or replacement are normal and disc is not defective unless they are serious. But when there are deep scratches or scratches all over disc surface, replace it. When only one side is scratched, polish and correct that side.
Front brake disc thickness "a"
Standard: 25 mm (0.984 inch)
Limit: 23 mm (0.905 inch)
Use wheel nuts (1) and suitable plain washers (2) to hold the disc securely against the hub, then mount a dial gauge (3) as shown in figure and measure the runout at 25 mm (0.98 inch) from the outer edge of the disc.
NOTE:
Check front wheel bearing for looseness before measurement.
Front brake disc deflection
Limit: 0.1 mm (0.004 inch)
Slide Pin Bolt / Cylinder Slide Pin
Check slide pin (bolt) for smooth movement as shown in figure.
If it is found faulty, correct or replace. Apply rubber grease to slide pin (bolt) outer surface.
Rubber grease should be the on whose viscosity is less affected by such low temperature a -40° C (-40°F).
Dust Boot
Check boot for breakage, crack and damage. If defective, replace.