TROUBLESHOOTING 307
Troubleshooting Disc Brake Problems
Condition
Possible
Cause
Noise—groan—brake noise emanat-
ing when slowly releasing brakes
(creep-groan)
Not detrimental to function of disc brakes—no corrective ac-
tion required. (This noise may be eliminated by slightly increas-
ing or decreasing brake pedal efforts.)
Rattle—brake noise or rattle emanat-
ing at low speeds on rough roads,
(front wheels only).
1. Shoe anti-rattle spring missing or not properly positioned.
2. Excessive clearance between shoe and caliper.
3. Soft or broken caliper seals.
4. Deformed or misaligned disc.
5. Loose caliper.
Scraping
1. Mounting bolts too long.
2. Loose wheel bearings.
3. Bent, loose, or misaligned splash shield.
Front brakes heat up during driving
and fail to release
1. Operator riding brake pedal.
2. Stop light switch improperly adjusted.
3. Sticking pedal linkage.
4. Frozen or seized piston.
5. Residual pressure valve in master cylinder.
6. Power brake malfunction.
7. Proportioning valve malfunction.
Leaky brake caliper
1. Damaged or worn caliper piston seal.
2. Scores or corrosion on surface of cylinder bore.
Grabbing or uneven brake action-
Brakes pull to one side
1. Causes listed under "Brakes Pull".
2. Power brake malfunction.
3. Low fluid level in master cylinder.
4. Air in hydraulic system.
5. Brake fluid, oil or grease on linings.
6. Unmatched linings.
7. Distorted brake pads.
8. Frozen or seized pistons.
9. Incorrect tire pressure.
10. Front end out of alignment.
11. Broken rear spring.
12. Brake caliper pistons sticking.
13. Restricted hose or line.
14. Caliper not in proper alignment to braking disc.
15. Stuck or malfunctioning metering valve.
16. Soft or broken caliper seals.
17. Loose caliper.
Brake pedal can be depressed with-
out braking effect
1. Air in hydraulic system or improper bleeding proeedure.
2. Leak past primary cup in master cylinder.
3. Leak in system.
4. Rear brakes out of adjustment.
5. Bleeder screw open.
Excessive pedal travel
1. Air, leak, or insufficient fluid in system or caliper.
2. Warped or excessively tapered shoe and lining assembly.
3. Excessive disc runout.
4. Rear brake adjustment required.
5. Loose wheel bearing adjustment.
6. Damaged caliper piston seal.
7. Improper brake fluid (boil).
8. Power brake malfunction.
9. Weak or soft hoses.
Содержание 1963 Corvette
Страница 29: ...3 0 1973 3 0 15 18 Is 454 8 18 24 15 4 0...
Страница 36: ...GENERAL INFORMATION AND MAINTENANCE 31 CM E 8 in 1 o s 1 O 1 8 o o o o CD o o o CO E o o o co JD in fCD I ts...
Страница 83: ...OHMMETER OHMMETER Stator testing perforated case models...
Страница 125: ...Wear ridge must be removed before piston removal...
Страница 161: ...14 Vacuum piston 15 Vacuum piston spring 16 Pump plunger assembly 17 Pump plunger return spring 18 Primary float...
Страница 205: ...EMISSION CONTROLS AND FUEL SYSTEM 187 8 CO 8 8 8 8 inCM CO 8 CM I I I IS N ino 1...