Monday, February 6, 2012

How to test Drum Brakes?


Before testing drum brake its advisable to inspect the drum brake.
For the the procedure is mentioned in the ;link below :----
http://repairhelpcenter.blogspot.in/2012/02/how-to-inspect-brake-drums.html

Now for drum brake testing, the details are as follows :----


Road testing allows you to evaluate brake performance under actual driving conditions. Whenever practical, perform the road test before beginning any work on the brake system. In every case, road test the vehicle after any brake work to make sure the brake system is working safely and properly.
WARNING
Before test driving any car, first check the fluid level in the master cylinder. Depress the brake pedal to be sure there is adequate pedal reserve. Make a series of low-speed stops to be sure the brakes are safe for road testing. Always make a preliminary inspection of the brake system in the shop before taking the vehicle on the road.
  • Brakes should be road tested on a dry, clean, reasonably smooth, and level roadway. A true test of brake performance cannot be made if the roadway is wet, greasy, or covered with loose dirt. All tires do not grip the road equally.
  • Testing is also adversely affected if the roadway is crowned so as to throw the weight of the vehicle toward the wheels on one side, or if the roadway is so rough that wheels tend to bounce.
  • Test brakes at different speeds with both light and heavy pedal pressure.
  • Avoid locking the wheels and sliding the tires on the roadway.
  • There are external conditions that affect brake road-test performance.
  • Tires having unequal contact and grip on the road cause unequal braking. Tires must be equally inflated and the tread pattern of right and left tires must be approximately equal.
  • When the vehicle has unequal loading, the most heavily loaded wheels require more braking power than others and a heavily loaded vehicle requires more braking effort.
  • A loose front-wheel bearing permits the drum and wheel to tilt and have spotty contact with the brake linings, causing erratic brake action.
  • Misalignment of the front end causes the brakes to pull to one side.
  • Also, a loose front-wheel bearing could permit the drum to tilt and have spotty contact with brake shoe linings, causing pulsations when the brakes are applied.
  • Faulty shock absorbers that do not prevent the car from bouncing on quick stops can give the erroneous impression that the brakes are too severe.


This details will help.
Thanks.

See below the latest help solutions,related to brakes:----

Brake Bleeder Screw Function?

http://repairhelpcenter.blogspot.in/2012/02/brake-bleeder-screw-function.html

Replacing ABS unit on Buick Century?

http://technoanswers.blogspot.in/2012/02/replacing-abs-unit-on-buick-century.html

Brake pedal is pulsating and vibrating?

http://repairhelpcenter.blogspot.com/2012/01/brake-pedal-is-pulsating-and-vibrating.html

All types of brake problems and repairs

http://howtobyme.blogspot.com/2011/11/abs-and-service-light-comes-on.html

               

ABS light stays on but brakes work fine?

http://howtobyme.blogspot.com/2011/11/abs-light-stays-on-but-brakes-work-fine.html

VCS maintenance required on Toyota Camry?

http://howtobyme.blogspot.com/2011/11/vcs-maintaince-required-on-toyota-camry.html

VCS and ABS lights go on and off intermittently on Lexus?

http://howtobyme.blogspot.com/2011/11/vcs-and-abs-lights-go-on-and-off.html

ABS & Brake lights warning indicator steady on dash and speedometer not working for Dodge Ram?

http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html

Isuzu rodeo speedometer is jumping?

http://schematicsdiagram.blogspot.com/2012/01/isuzu-rodeo-speedometer-is-jumping.html

E-brake is stuck down on Ford Focus?

http://schematicsdiagram.blogspot.com/2011/12/e-brake-is-stuck-down-on-ford-focus.html

Brake warning light comes on and car will not start intermittently?

http://repairhelpcenter.blogspot.com/2011/12/brake-warning-light-comes-on-and-car.html

When the car stops, abs pump turns ON?

http://howtobyme.blogspot.com/2011/12/when-car-stopsabs-pump-turns-on.html

Where is Power Brake Booster located on 1995 Lincoln Town Car?

http://howtobyme.blogspot.com/2011/12/where-is-power-brake-booster-located-on.html

Sometimes ABS light comes on while Driving?

http://howtobyme.blogspot.com/2011/12/sometimes-abs-light-comes-on-while.html

How Anti-Lock Brakes Work?


Brake System Troubleshooting?

http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html

Car Brake lines have no pressure?

http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html

Car Brakes Dragging?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html

Car Brakes grabbing?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html

Car Brakes Making Noise?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

Car Brakes Pulling?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html

Pulsating Brake Pedal?

http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html

Spongy brake pedal?

http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html

Hard Brake Pedal?

http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html

How to Disconnect Power to EBCM on Pontiac Grand Prix?

http://schematicsdiagram.blogspot.com/2011/12/how-to-disconnect-power-to-ebcm-on.html

Where is ABS/TCS module located on 2005 Cadillac Deville

http://schematicsdiagram.blogspot.com/2011/12/where-is-abstcs-module-located-on-2005.html

How to Replace Power Brake Booster on 1996 GMC Jimmy?

http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-power-brake-booster-on.html

Isuzu Trooper Shifts hard and Engine Revving in stop?

http://schematicsdiagram.blogspot.com/2011/12/isuzu-trooper-shifts-hard-and-engine.html

What is Brake Bleeder Screw?

http://repairhelpcenter.blogspot.com/2011/12/what-is-brake-bleeder-screw.html

How to replace car Brake Cable?

http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-car-brake-cable.html

How to Replace Brake Disc?

http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-brake-disc.html

ABS motor keeps running?

http://schematicsdiagram.blogspot.com/2012/01/abs-motor-keeps-running.html

Anti-lock brake light stays on all the time?

http://technoanswers.blogspot.com/2012/01/anti-lock-brake-light-stays-on-all-time.html

Is it necessary to replace Brake caliper while replacing rotors and brake pads?

http://repairhelpcenter.blogspot.com/2012/01/is-it-necessary-to-replace-brake.html

Emergency brake Adjustment for Hyundai Tiburon?

http://schematicsdiagram.blogspot.com/2012/01/emergency-brake-adjustment-for-hyundai.html

How does Brake Backing Plate works?

http://repairhelpcenter.blogspot.in/2012/02/how-does-brake-backing-plate-works.html

How to replace control panel on Audi A4 models?

How to inspect, service and replace brake shoe liner?

How to inspect brake drums?



No comments:

Post a Comment