Mazda MX-5 1990 Workshop Manual page 452

BRAKE SYSTEM
p
TROUBLESHOOTING GUIDE
Problem
Possible cause
Action Page
Poor braking
Leakage of brake fluid
Repair
-
Air in lines Air bleed
P- 6
Worn pad Replace P-18,22
Brake fluid, grease, oil, or water on pad Clean or replace P-18,22
Hardening of pad surface or poor contact
Grind or replace P-18,22
Malfunction of disc brake piston Replace
P-19,23
Malfunction of master cylinder
Repair or replace P-10
Malfunction of power brake unit Repair or replace P-15
Malfunction of check valve (vacuum hose) Repair or replace
P-15
Damaged vacuum hose Replace P-15
Deterioration of flexible hose Replace P- 6
Malfunction of proportioning bypass valve (PBV) Replace P-16
Brakes pull to one Worn pad Replace P-18,22
side Brake fluid, grease, oil, or water on pad Clean or replace
P-18,22
Hardening of pad surface or poor contact
Grind or replace
P-18,22
Abnormal wear, distortion, or eccentricity of disc Repair or replace Section M
Malfunction of automatic adjuster in rear brake Repair
-
Looseness or deformation of dust cover mounting bolt Tighten or replace Section M
Malfunction of disc brake piston Repair or replace P-19,23
Worn or improperly adjusted wheel bearing preload Replace or adjust Section M
Improper adjustment of wheel alignment Adjust
Section R
Unequal tire air pressure
Adjust Section
Q
Brakes do not No brake pedal play Adjust P- 8
release Improper adjustment of push rod clearance Adjust P-11
Clogged master cylinder return port
Clean -
Pad not returning properly
Repair
-
Improper return of malfunction of brake caliper piston
Replace P-21,25
Excessive runout of disc plate
Replace Section M
Improper adjustment of wheel bearing preload Adjust or replace Section M
Pedal goes too far
Air in system because of insufficient brake fluid Add fluid and bleed air P- 6
(Too much pedal
Improper adjustment of pedal play Adjust
P- 8
stroke) Worn pad
Replace P-18,22
Air in lines
Bleed air P- 6
Abnormal noise or Worn pad
Replace P-18,22
vibration during Deterioration of pads
Grind or replace P-18,22
braking Brakes do not release
Repair
-
Foreign material or scratches on disc plate contact
Clean -
surface
Looseness of caliper mounting bolt(s) Tighten P-19,23
Damage or deviation of disc contact surface Replace
Section M
Poor contact of pads
Repair or replace P-18,22
Insufficient grease on sliding parts
Apply grease -
05UOPX-004
P-5