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TROUBLESHOOTING
SCG Classic Car Troubleshooting Checklist - Disc Brakes
Excessive pedal travel
- Friction pad knocks-back after violent cornering
- Pads not properly seated or positioned
- Insufficient fluid in master cylinder reservoir
- Loose wheel bearing
- Damaged caliper piston seal
- Improper booster push rod adjustment
Brake roughness or pedal chatter
- Excessive lateral runout of disc
- Sides of disc (rotor) not parallel
Excessive pedal effort
- Pistons seized
- Fluid or grease on lining
- Pads worn beyond specifications
- Proportioning valve malfunction
- Inoperative booster unit
Pulls to one side
- Piston seized
- Fluid or grease on lining
- Caliper not in alignment with disc
- Loose caliper
Brakes groan
- This is normal under light pedal pressure conditions
Rattle
- Excessive clearance between caliper and pad
- Pad hold-down clips missing or improperly positioned
Brakes heat up and fail to release
- Seized piston
- Driver rides brake pedal
Leaky wheel cylinder
- Damaged piston seal
- Scored bores
- Corroded bores and/or piston
Grabbing or uneven braking action
- Seized piston
- Fluid or grease on pads
- Proportioning valve malfunction
- Caliper out of alignment with disc
- Caliper loose on braket
No braking effort when pedal is depressed
- Friction pad not properly seated
- Low fluid
- Damaged piston seal
- Bleeder screw leaking
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