Brake judder is a braking induced, forced vibration occurring in different types of vehicles. The judder frequency is directly proportional to the revolution speed of the wheel and therefore also to the velocity of the vehicle. The driver experiences judder as vibrations in the steering wheel, brake pedal and floor. In the higher frequency range, the structural vibrations are accompanied by a sound. Brake judder primarily affects the comfort but could, when confronting an inexperienced driver for the first time, lead to faulty reactions and reduced driving safety. Furthermore, a specific type of judder, so-called hot judder, is related to disc cracking. There are numerous publications available dealing with high frequency vibrations, such as brake squeal, including mathematical models for analysis and simulation. However, low frequency phenomena, such as brake judder and groan, have received much less attention. There is a growing interest from the automotive industry concerning brake judder. Even though few companies would admit that they have the problem, it is not unusual to meet people who have experienced the problem in their own passenger cars. Much of the knowledge concerning brake judder remains within the companies. Hence, very few people have the full picture. The purpose of the present paper is to give an overview of the brake judder problem.
HulténJ. Drum brake squeal. PhD thesis, Machine and Vehicle Design, Chalmers University of Technology, Göteborg, 1998.
2.
InoueH. Analysis of brake judder caused by thermal deformation of brake disc rotors. In Proceedings, 21st FISITA Congress, Belgrade, 1986, pp. 213–219, paper 865131.
3.
KaoT. K.RichmondJ. W.MooreM. W. The application of predictive techniques to study thermo-elastic instability of brakes. In Proceedings of the Twelfth Annual Brake Colloquium and Engineering Display, Atlanta, Georgia, 1984, SAE paper 942087.
4.
JacobssonH. Frequency sweep approach to brake judder, part A: the brake judder phenomenon. Classification and problem approach. Licentiate thesis, Chalmers University of Technology, Göteborg, 1998.
5.
JacobbsonH. Brake judder. Thesis, Chalmers University of Technology, Göteborg, 2001.
6.
AbdelhamidM. K. Creep groan of disc brakes. In Proceedings, Noise and Vibration Conference, Traverse City, Michigan, 1995, pp. 396–400, SAE paper 951282.
7.
KaoT. K.RichmondJ. W.DouarreA.Brake disc hot spotting and thermal judder: An experimental and finite element studyInt. J. Veh. Des., 2000, 23 (3/4), 276–296.
8.
BrooksP. C.BartonD.CrollaD. A.LangA. M.SchaferD. R. A study of disc brake judder using a fully coupled thermo-mechanical finite element model. In Proceedings, 25th FISITA Congress, Beijing, 1994, pp. 340–349, SAE paper 945042.
9.
AbdelhamidM. K. Brake judder analysis: case studies. SAE paper 972027, 1997.
10.
KreitlowW.SchrödterF.MatthaäiH.Vibration and ‘hum' of disc brakes under load. SAE paper 850079, SAE Trans., Sect. 1, 1985, 431–437.
11.
AugsburgK.BrunnerH.GrochowiczJ.Untersuchungen zum Rubbelverhalten von Pkw-SchwimmsattelbremserAutomobiltechnische Zeitschrift, 1999, 101.
12.
StringhamW.JankP.PfeiferJ.WangA.Brake roughness—disc brake torque variation, rotor distortion and vehicle response. SAE paper 930803, SAE Trans., Sect. 6, 1993, 1235–1247.
13.
EngelH. G.BachmanTh.EichhornU.SaameCh.Dynamical behavior of brake-disc geometry as cause of brake judder. In Proceedings, EAEC Fourth International Conference onVehicle and Traffic System Technology, Strasbourg, France, 1993, Vol. 1, pp. 456–481.
14.
ThuressonD. Thermomechanical analysis of friction brakes. In Proceedings of the Eighteenth Annual Brake Colloquium and Engineering Display, 2000, Vol. P-358, pp. 149–159, SAE paper 2000–01-2775.
15.
RichmondJ. W.KaoT. K.MooreM. W.The development of computationalanalysis techniques for disc brake pad design. In Proceedings, Advances in Automotive Braking Technology: Design Analysis and Material Developments, 1996 (Institution of Mechanical Engineers).
16.
AbendrothH.Ste enT.FalterW.HeidtR.Investigation of CV rotor cracking test procedures. In Brakes 2000, International Conference onAutomotive Braking—Technologies for the 21st Century, 2000, pp. 149–162 (Professional Engineering Publishing, London).
17.
HaighM. J.SmalesH.AbeM. Vehicle judder under dynamic braking caused by disc thickness variation. In Proceedings, Braking of Road Vehicles, London, 1993, pp. 247–258, IMechE paper C444/022/93.
18.
BörjessonM.ErikssonP.KuylenstiernaC.NilssonP. H.HermanssonT. The role of friction films in automotive brakes subjected to low contact forces. In Proceedings, Braking of Road Vehicles, London, 1993, pp. 259–267, IMechE paper C444/026.
19.
WirthA.WhitakerR.Developments in cast iron technology. In Proceedings, Advances in Automotive Braking Technology: Design Analysis and Material Developments, Leeds, UK, 1996 (Institution of Mechanical Engineers).
20.
ThomsE. Disc brakes for heavy vehicles. In Proceedings, Braking of Road Vehicles, London, 1988, pp. 133–137, IMechE paper C464/88.
21.
AvilésR.HennequetG.HernándezA.LlorenteL. I.Low frequency vibrations in disc brakes at high car speed. Part I: Experimental approachInt. J. Veh. Des., 1995, 16 (6), 542–555.
22.
SteffenT.BrunsR.Hotspotsbildung bei Pkw-BremsscheibenAutomobiltechnische Zeitschrift, 1998, 100, 408–413.
23.
JacobssonH. Analysis of brake judder by use of amplitude functions. In Proceedings of SAE Noise and Vibration Conference, 1999, SAE paper 1999–01-1779.
24.
JacobssonH. Wheel suspension related disc brake judder. In Proceedings, ASME Design Engineering Technical Conferences, Sacramento, California, 1997, VIB-4165.
25.
EngelH. G.HassiotisV.TiemannR. System approach to brake judder. In Proceedings, 25th FISITA Congress, Beijing, 1994, Vol. 1, pp. 332–339, paper 945041.
26.
MartinR. H.BowronS.Composite materials in transport friction applications. In Brakes 2000, International Conference onAutomotive Braking—Technologies for the 21st Century, 2000, pp. 207–216 (Professional Engineering Publishing, London).
PalmerB. B.WeintraubM. H.The role of engineered cashew particles on performance. In Brakes 2000, International Conference onAutomotive Braking—Technologies for the 21st Century, 2000, pp. 185–195 (Professional Engineering Publishing, London).
29.
KoetniyomS.BrooksP. C.BartonD. C.Finite element prediction of inelastic strain accumulation in cast-iron brake rotors. In Brakes 2000, International Conference onAutomotive Braking—Technologies for the 21st Century, 2000, pp. 139–148 (Professional Engineering Publishing, London).
30.
HudsonM. D.RuhlR. L. Ventilated brake rotor air flow investigation. SAE paper 971033, 1997.
31.
GrieveD. G.BartonD. A.CrollaD. A.ChapmanJ. L.BuckinghamJ. T.Alternative brake disc materials. In Proceedings, Advances in Automotive Braking Technology: Design Analysis and Material Developments, Leeds, UK, 1996 (Institution of Mechanical Engineers).
32.
GrieveD. G.BartonD. C.CrollaD. A.BuckinghamJ. K.Design of a lightweight automotive brake disc using finite element and Taguchi techniquesProc. Instn Mech. Engrs, Part D: J. Automobile Engineering, 1998, 212, 245–254.
33.
KrupkaR.KienzleA. Fiber reinforced ceramic composite for brake discs. In Proceeding of the Eighteenth Annual Brake Colloquium and Engineering Display, 2000, Vol. P-358, pp. 67–69, SAE paper 2000–01-2761.
34.
BosworthR. Investigations of secondary ride aspects of steering wheel vibration (shimmy and judder) using Taguchi methodology. In Proceedings, AUTOTECH 89, London, 1989, IMechE paper C399/9.
35.
KimM.-G.JeongH.-I.YooW.-S. Sensitivity analysis of chassis system to improve shimmy and brake judder vibration on steering wheel. SAE Special Publication 1136, 1996, pp. 59–70.
36.
AbdelhamidM. K. Brake judder analysis using transfer functions. In Proceedings, SAE Brake Colloquium, Tempe, Arizona, 1997, pp. 5–9, SAE paper 973018.
37.
KaoT. K.RichmondJ. W.MooreM. W.Computational analysis of pad performance. In Proceedings, Braking of Road Vehicles, 1993, paper C444/027/93 (Institution of Mechanical Engineers).
38.
FloquetA.DubourgM.-C.Realistic braking operation simulation of ventilated disc brakesTrans. ASME, J. Tribology, July 1996, 118, 466–472.
39.
DuS.ZagrodzkiP.BarberJ. R.HulbertG. M.Finite element analysis of frictionally excited thermoelastic instabilityJ. Thermal Stresses, 1997, 20, 185–201.
40.
DaudiA. R.DickersonW. E.NarainM.Hayes’ increased airflow rotor design. In Proceedings, Second International Seminar onAutomotive Braking, Recent Developments and Future Trends, Leeds, UK, 1998, pp. 127–143 (Institution of Mechanical Engineers).
41.
CrollaD. A.LangA. M.Brake noise and vibration—the state of the artVehicle Tribology, Tribology Series, Vol. 18, 1991, (Elsevier), pp. 165–174.
42.
AvilésR.HennequetG.AmezuaE.VallejoJ.Low frequency vibrations in disc brakes at high car speed. Part II: Mathematical model and simulationInt. J. Veh. Des., 1995, 16 (6), 556–569.
