| Disc Type Hydraulic Brake Trouble Diagnosis Chart
| | Complaint | Possible Cause | Check or Correction |
| 1. | Excessive pedal travel | a) Excessive disc run out.
b) Air leak or insufficient fluid (Brake oil).
c) Improper brake oil (has oiled).
d) Warped or tapered shoes.
e) Loose wheel bearing adjustment.
f) Damaged piston seal.
g) Power brake is not functioning correctly. | (a) Check run out. If excessive, install new disk.
(b) Check system for leaks.
(c) Drum and install correct brake oil.
(d) Install new shoe.
(e) Re adjust.
(f) Install new seal.
(g) Check power unit |
| 2. | Brake roughness or chatter pedal pulsating | a) Excessive disk run out.
b) Disk out of parallel.
c)Loose wheel bearing. | (a) Check run out, if excessive, install and disk.
(b) Check run out. If excessive, install new disk.
(c) Readjust |
| 3. | Excessive pedal effort | a) Power break malfunctioning.
b) brake fluid, oil or grease on linings.
c) Lining worn.
d) Incorrect lining .
e) Frozen or biased pistons | (a) Check power unit.
(b) Install new linings.
(c) Install new shoes and linings.
(d) Install correct lining.
(e) Disassemble caliper and free up pistons. |
| 4. | Pull | (a) Bake fluid oil or grease on linings.
(b) Frozen or seized pistons.
(c) Incorrect tire pressure.
d) distorted brake shoes.
e) Front end out of alignment.
f) Broken rear springs.
g) Restricted hose or line.
h) Unmatched linings. | (a) Install new linings.
(b) Disassembled calipers and free up pistons.
(c) Inflate tire to recommended pressure. Install new brake shoes.
(d) Check and align front end.
(e) Install new rear spring.
(f) Check hoses or lines and correct as necessary.
(h) Install correct lining. |
| 5. | Scraping | (a) Mounting Blots too long.
(b) Disk rubbing housing.
(c) Loose wheel bearings.
(d) Lining worn, allowing tell late tabs to scrape on disk. | (a) Install mounting bolts of correct length.
(b) Check for rust or mud bold up on caliper housing. Check caliper mounting and bridge bolt tightness.
(c) Readjust
(d) Replace lining. |
| 6. | Brake heat up during and fail to release. | (a) Power brake malfunction
(b) Sticking pedal linkage
(c) Operator riding brake pedal.
(d) Frozen biased piston.
(e) Residual pressure valve in master cylinder. | (a) Check and correct power unit.
(b) Free up sticking pedal linkage.
(c) Instructor owner how to drive with disk brakes.
(d) Disassembled caliper, hone cylinder bore, clean seal groove and install new pistons, seals and boots.
(e) Remove valve from cylinder. |
| 7. | Leaky wheel cylinder. | a) Damaged or piston seal.
b) Scores or corrosion on surface of piston. | (a) Install new steel.
(b) Disassemble caliper and hone cylinder hone. If necessary, install new pistons. |
| 8. | Grabbing or uneven braking action. | a) Power brake malfunction.
b) Causes under item. | (a) Check and correct unit.
(b) Correction listed under item. |
| 9. | Brake pedal can be depressed without braking effect. | a) Piston pushed back in cylinder bones during servicing of caliper (shoe and lining not properly positioned).
b) Leak in system or caliper.
(c) Damaged piston seal in one or more of the cylinders.
d) Air in hydraulic system or improper building procedure.
(e) Bleeder screw open.
(f) Leak past primary cup in master cylinder. | (a) Reposition the brake shoes and lining assembles. Depress pedal a wand time and if condition persists, check the following causes.
(b) Check for leak and repair as required.
(c) Disassemble caliper and replace piston seal as required.
(d) Bleed the system.
(e) Close bleeder screw and bleed the entire system.
(f) Recondition the master cylinder. |
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