Trouble Shooter
Excessive brake pedal travel1. Brakes need adjusting or replacement.1. Adjust or renew brake shoes.
2. Air in system.2. Bleed hydraulic system.
3. Leaking or contaminated fluid.2. Bleed hydraulic system.
4. Faulty master cylinder.4. Fit new master cylinder.
Brake fade1. Incorrect pad or lining material.1. Fit new pads or shoes.
2. Old or contaminated fluid.2. Renew brake fluid.
3. Excessive use of brakes or car overloaded.3. Check vehicle load.
Spongy brake pedal1. Air in hydraulic system.1. Bleed system.
2. Shoes badly lined or distorted.2. Fit new pads or shoes.
3. Faulty hydraulic cylinder.3. Check hydraulic circuit.
Brake pedal too hard1. Seized wheel cylinder or calliper piston.1. Replace seized component.
2. Glazed friction material.2. Fit new shoes/pads.
Brake pedal requires pumping or loss of pedal1. Brakes wrongly adjusted.1. Adjust brakes.
2. Air in hydraulic system.2. Bleed system.
3. Fluid leak from component or brake pipe.3. Check hydraulic circuit and replace parts as necessary.
4. Loss of fluid from master cylinder.4. Check hydraulic circuit and replace parts as necessary.
Brakes grab when applied1. Contaminated friction material.1. Replace (don't clean) pads or shoes.
2. Wrong linings fitted.2. Replace (don't clean) pads or shoes.
3. Scored drums or discs.3. Fit new drum or disc.
Brake squeal1. Worn retaining pins (disc).1. Fit new pins.
2. Faulty damping shims or shoe retaining clips.2. Fit new shims or clips.
3. Dust in drum.3. Remove dust from drums and shoe.
4. Loose backplate or calliper.4. Tighten calliper or backplate.
Brake judder1. No clearance at master cylinder operating rod.1. Adjust rod if possible.
2. Shoe tension springs either broken or weak.2. Replace tension springs.
3. Wheel cylinder or calliper piston seizing.3. Fit new calliper or cylinder.
4. Faulty self-adjusting mechanism.4. Check mechanism.
5. Seized handbrake mechanism.5. Check handbrake operation.
Brake pull to one side1. Contaminated friction material on one side only (grease, oil or brake fluid).1. Replace shoes/pads all round.
2. Loose backplate.Tighten backplate.
3. Seized cylinder.Replace seized cylinder.
4. Faulty suspension or steering.4. Check suspension and steering.
Handbrake ineffective1. Worn rear shoes or pads.1. Fit new pads/shoes.
2. Brakes require adjusting.2. Adjust brakes.
3. Faulty handbrake linkage.3. Check linkage and operating mechanism.
4. Cable or rod requires adjustment.4. Adjust cable or rod.
Servo (where fitted) late in operation1. Blocked filter.1. Clean or replace filter.
2. Bad vacuum sealing or restricted air inlet.2.Tighten vacuum hose connections and check hoses.
Loss of servo action when braking heavily1. Air leak in servo - vacuum low.1. Either overhaul servo or replace.
Loss of fluid (Servo only)1. Seal failure.1. Replace or overhaul servo.
2. Scored servo bores.2. Replace or overhaul servo.
3. Damaged or corroded fluid pipes.3. Inspect and fit new pipes.