LOW BRAKE FLUID
- Possible cause is a leak in the brake system.
- Inspect for leaks and repair or replace all defective
components.
SPONGY OR SOFT PEDAL
- Possible causes are air in the hydraulic system, low
fluid or soft ballooning hose.
- Inspect for leaks and bleed the hydraulic system per
vehicle recommendations.
PEDAL SINKS TO FLOOR
- Possible causes are worn master cylinder or a leak
in the hydraulic system.
- Inspect for leaks and repair or replace all defective
components.
- Note vehicle is not safe to operate
SCRAPING NOISE
- Possible cause brake lining very thin or
metal-to-metal contact.
- Inspect brake system and repair as
necessary.
- Note vehicle is not safe to operate.
CHATTER
- Possible cause are warped rotors or rotors that
have been improperly finished.
- Inspect brake system & machine or replace rotors.
DRAGGING BRAKES
- Possible causes are stuck emergency brake,
damaged retracting springs.
- jammed calipers piston, damaged caliper mounting
pins or bushings.
- Inspect brake system & repair or replace all
damaged components
HARD PEDAL
- Possible causes are low engine vacuum, vacuum
leak, and defective boost unit; check valve, loose power steering
pump belt, low fluid level or leaks in the hydro boost unit.
- Inspect vacuum line, connections & brake
system to identify source of problem and repair as necessary.
LOW BRAKE PEDAL
- Possible causes are a
sticky shoe adjuster that fails to compensate for wear, worn lining
or fluid leak.
-
Inspect for wear and leaks, clean and adjust brakes.
EXCESSIVE PEDAL TRAVEL
- Possible causes are worn brake linings, air in the
hydraulic system or out of adjustment.
- Inspect brake system for leaks, worn components & adjust as necessary
PEDAL PULSATION
- Possible cause are warped rotors.
- Inspect and machine rotors or
replace if necessary
SQUEALS
- Possible cause is vibration between the
lining & rotors or drums.
- Inspect brakes & machine the rotors
& applying brake grease or noise compound to the backs of
the pads.
GRABBY BRAKES
- Possible cause oil, grease, brake
fluid on the linings or badly scored rotors.
- Inspect brake system for
source of contamination; repair leak, replace linings & machine rotors if necessary
BRAKES PULL TO ONE SIDE
- Possible causes are contaminated linings, out of
adjustment, leaking wheel cylinder or caliper, loose wheel
bearings.
- Inspect brake system replace any contaminated
linings & repair or replace all defective components, clean
& adjust.
BEDDING BRAKES
To function properly the organic brake pads
must develop a friction coal on the surface that develops around
537°F temperature. Using a gradual process to generate the
penetrating temperature it will distribute evenly through the entire
disc and pad material. Careful heating and cooling process
ensures a good release of both materials. The bedding in should
be done as follows:
- Drive at approximately 35 mph for about 500
yards dragging the brakes to allow the temperature to slowly and
evenly build up to 572°F.
- Next, drive about 2200 yards maintaining the
same speed without braking allowing the pads and discs to cool
down. After cool-down, perform a normal stop from 35 to 0
mph. No panic stops!
- Now, the friction surface has evenly developed
friction coal, the pads have bonded with the disc surface,
and tensions in the disc materials will
have disappeared.
This bedding process is
applicable to the front brakes only.
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