troubleshooting the brake system |
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shogun
Really Senior Member II Joined: 22-February-2005 Location: Tokyo/Japan Status: Offline Points: 564 |
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Posted: 20-August-2011 at 03:54 |
Fault Brakes pull to one side Cause a) Tyre pressure incorrect b) Unevenly worn tire treads c) Oil on pads/liners d) Wrong type of pads/liners e) Dirty floating caliper recesses f) Guide bolts dirty or damaged g) Rear wheel alignment adjusted incorrectly h) Corrosion in floating calipers or wheel cylinders i) No shock absorber action k) Pad of one caliper worn l) Pad glazed Remedy a) Correct tire pressure b) Change or replace tyres c) Replace brake linings, check for causes d) Replace brake linings,check for causes e) Remove and install/clean floating calipers f) Replace guide bolts g) Check wheel alignment h) Remove and install, repair or replace floating calipers or wheel cylinders i) Check shock absorber, replacing if necessary k) Replace brake linings , Check floating caliper l) Replace brake linings , Check floating caliper Fault Brakes excessively hot while driving Cause a) Vent bore in master cylinder clogged b) No play between push rod and master cylinder piston c) Swollen rubber parts due to use of wrong brake fluid d) Vent bore in expansion tank clogged e) Corroded floating calipers f) Cross spring broken g) Handbrake lever not released fully Remedy a) Overhaul master brake cylinder,replacing if necessary b) Adjust push rod (in older cars) c) Overhaul master brake cylinder,replacing if necessary d) Clean expansion tank e) Remove and install, repair or replace floating calipers f) Replace cross spring g) Check handbrake and handbrake cables ,repair if necessary Fault Poor braking effect in spite of great force on pedal Brake-pedal travel normal Cause Brake pads oil-splattered or burnt; wrong type of brake pads Remedy Replace brake linings Fault Poor braking effect in spite of great force on pedal Brake-pedal travel short Cause Brake booster malfunctions - engine vacuum Remedy Check brake booster system - Check engine (valves, cylinder head gasket etc.) Fault Poor braking effect in spite of great force on pedal Brake-pedal travel long Cause One brake circuit failed due to leaks or damage Remedy Leakage test of brake system Fault Brake pedal can be pressed down softly and springily Cause a) Air in braking system b) Insufficient brake fluid in expansion tank - refer to a) c) Overheated brake fluid - vapour lock due to excessive water content in brake fluid or excessive brake loads Remedy a) Top up or change brake fluid Bleed brakes b) Top up or change brake fluid Bleed brakes c) Top up or change brake fluid Bleed brakes Fault Brake is bled and readjusted, but brake pedal can be pressed down too far Cause a) Primary cup in master cylinder damaged b) Separating cups on floating piston of tandem-brake master cylinder leak c) Leak in braking system Remedy a) Overhaul or replace brake master cylinder b) Overhaul or replace brake master cylinder c) Leakage test of brake system Fault Uneven pad wear Cause a) Wrong type of pads/liners b) Dirty fist caliper recesses, damaged caps c) Corrosion in floating calipers or wheel cylinders d) Swollen rubber ring for piston control Remedy a) Replace brake linings b) Remove and install, repair or replace floating calipers or wheel cylinders c) Remove and install, repair or replace floating calipers or wheel cylinders d) Remove and install, repair or replace floating calipers or wheel cylinders Fault Brake pads worn at angle Cause a) Wheel-bearing play excessive b) Brake disc not aligned with fist caliper c) Corrosion in floating calipers or wheel cylinders d) Angular brake-disc wear e) Pads worn to less than minimum thickness f) Spring force insufficient g) Guide bolts damaged Remedy a) Replace wheel bearings b) Check floating caliper installation c) Remove and install, repair or replace floating calipers or wheel cylinders d) Grind or replace brake discs e) Replace brake linings f) Replace spring g) Replace guide bolts Fault Seized brake pads, pad does not move off brake disc Cause a) Dirty fist caliper recesses, damaged caps b) Corrosion in floating calipers c) Vent bore in master cylinder clogged Remedy a) Remove and install, repair or replace floating calipers b) Remove and install, repair or replace floating calipers c) Overhaul or replace brake master cylinder Fault Brakes squeal or rattle Cause a) Wrong type of pads/liners b) Dirty floating caliper recesses c) Spring force insufficient d) Brake disc not aligned with fist caliper e) Brake-disc runout f) Excessive thickness deviation within braking surface g) Brake drums eccentric h) Knocking brake drums i) Dirt and dust in brake drums k) Liner wear excessive or one-sided l) Rust edges on brake discs m) Pad loose n) Wheel-bearing play excessive Remedy a) Replace brake linings b) Remove and install/clean floating calipers c) Replace spring d) Check floating caliper installation e) Check brake discs for runout, replacing if necessary f) Measure brake disc thickness Grind or replace discs g) Grind or replace brake drums h) Grind or replace brake drums i) Clean and check brake drums k) Replace brake shoes l) Grind or replace brake discs m) Replace brake linings n) Replace wheel bearings Fault Brake-pedal dead travel excessive Cause a) Wheel-bearing play excessive b) Brake disc not aligned with fist caliper c) Brake-disc runout d) Excessive thickness deviation within braking surface e) Brake system leaky f) Air in braking system g) Wrong type of pads/liners h) Automatic slack control of brake shoes does not function Remedy a) Replace wheel bearings b) Check floating caliper installation c) Check brake discs for runout, replacing if necessary d) Measure brake disc thickness - Grind or replace discs e) Leakage test of brake system f) Bleed brakes g) Replace brake linings or Replace brake shoes h) Remove and install brake shoes , repair slack control Fault Jammed piston in brake caliper Cause a) Dirty fist caliper recesses, damaged caps b) Brake disc not aligned with fist caliper c) Corrosion on pistons in floating calipers or wheel cylinders Remedy a) Remove and install, repair or replace floating caliper b) Check floating caliper installation c) Remove and install, repair or replace floating caliper or wheel cylinder Fault Pulsating effect on brake pedal Cause ) Wheel-bearing play excessive b) Brake disc not aligned with fist caliper c) Brake-disc runout d) Excessive thickness deviation within braking surface Remedy a) Replace wheel bearings b) Check floating caliper installation c) Replace brake discs d) Measure brake disc thickness Grind or replace discs Fault Handbrake effect insufficient Cause a) Brake shoes oil-splattered b) Excessive dead travel between brake shoes and brake drums c) Excessive dead travel in cables d) Cables adjusted incorrectly e) Corroded transmitting elements Remedy a) Replace brake linings, determine cause b) Adjusting handbrake c) Adjusting handbrake d) Adjusting handbrake e) Remove and install handbrake and expander locks Check Bowden cables, replacing if necessary |
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