SAE J109-2000 pdf download Service Brake System Performance Requirements- Motorcycles and Motor-Driven Cycles
Scope-This SAE Recommended Practice establishes performance requirements for the service brakesystems of all classes of motorcycles intended for highway use.
Reference
2.1Applicable Publication–The following publication forms a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest issue of the SAE publication shall apply.
SAE J108-Brake System Road Test Code-MotorcyclesPerformance Requirements–When subjected to the test procedures in SAE J108, by a skilled rider, thefollowing requirements must be satisfied by the service brake system:
1. Preburnish Check
Deceleration shall be not less than 9.5 fpsps.a.
b.Brake svstem shall be free from any unusual conditions.
2. First Effectiveness Test
Shall meet the requirements specified in Table 1 and Table 2 when equipped with independenta.brake controls for front and rear.During all phases of the test, no condition shall be permitted to cause the vehicle to lose stabilitydue to wheel skid, to overturn, or to pull or swerve out of the specified width roadway lane.
Burnish Test-No unusual dispersion in deceleration values versus brake input at any stop shall bepermissible.
Second Effectiveness Test–Same as in item 2 First Effectiveness Test.
First Fade and Recovery Test5.
a. First Fade Test–First eight stops shall be achieved with a deceleration of not less than 11 fpspsand not less than 9.5 fpsps on the ninth and tenth stops.b. First Recovery Test-First five stops shall be achieved with deceleration not less than 9.5 fpspsand on sixth and after, not less than 11 fpsps.
6. First Effectiveness Spot Check-No unusual deceleration value versus brake input shall bepermissible.
7. First Reburnish
a. No unusual dispersion in deceleration values versus brake input shall be permissible.
b. No unusual condition shall be permissible on the brake system.
8Second Fade and Recovery Test
a. Second Fade Test–First eight stops shall be achieved with a deceleration of not less than11 fpsps, and not less than 9.5 fpsps on ninth and tenth stops.b.Second Recovery Test-First five stops shall be achieved with deceleration not less than 9.5fpsps and on sixth and after, not less than 10 fpsps.
9Second Effectiveness Spot Check-No unusual deceleration value versus brake input shall bepermissible.
10. Second Reburnish-Same as in item 7, First Reburnish.
11. Final Effectiveness Test-Same as in item 2, First Effectiveness Test, and item 4, SecondEffectiveness Test.
12. Final Inspection
a. Lining shall be firmly attached and intact on shoes. (Minor cracks that do not impair attachmentare acceptable.)b.No unusual wear that may interfere with braking function shall be permissible on lining.Scores or cracks that may interfere with brake action shall not develop on drums.C.d.All components of the brake system shall be intact and functional.
13. Water Recovery Test-Deceleration at all stops shall be within 35 to 120% of the average ofdeceleration values of the baseline check stops. Also, brakes shall recover a minimum of 80% of theaverage of deceleration values of the baseline check stops before the final stop.