Typical Brake Disc And Brake Their Root Causes
Typical brake disc and brakepad damage patterns andtheir root causeswww.meyle.com
Good brakes save lives!The consequences of choosing the wrong or low-grade brakeparts can be dramatic. Only use the brake components specifiedfor the given vehicle application. Brake system repairs may only beperformed by skilled and trained personnel. Adhere to the vehicleor brake manufacturer‘s specifications at all times.When installing new brake components, observe thefollowing: lways replace brake pads along with brake discs.A Always replace all brake discs and pads per axle. Be careful to bed in new brake discs and pads properly. Avoid unnecessary heavy braking on the first 200 kilometres. Brake performance may be lower on the first 200 drivenkilometres.Check for functional reliability after installation: P ump brake pedal until it becomes stiff. Pedal travel must not vary at constant pedal load after pedal hasbeen depressed several times. Check wheels for free rotation. Check brake fluid level in expansion tank and top up, if required. Perform check stops.MEYLE Platinum Disc:All-new finish. No degreasing.Fit and go.All MEYLE brake discs come as ready-to-mount assemblies, most ofthem featuring the locating screw. They do not require degreasingand are resistant to rim cleaners. Cutting-edge paint technologymade in Germany provides MEYLE Platinum Discs with long-termanti-corrosion protection while adding a brilliant appearance.Further refinement of the tried-and-tested MEYLE finish has led toenvironmentally-friendly production processes.MEYLE Platinum Discs – the safety solution engineered by oneof the industry‘s leading experts in coated brake discs.www.meyle.com
Overheating of the matingfriction surfacesScore and groove markson disc brakesThe problem:The problem:Brake pad fails to disengage and rubs against the disc. This cancause the brake system to overheat.Score and groove marks on brake disc friction surfaces.Causes: Brake pad seized Brake piston stuck in calliper Driving with depressed brake pedal, e.g. when going downhillPossible consequences:Causes:F oreign objects between brake disc and pad (dirt, road salt, etc.)CorrosionOverly soft brake discsLow-grade brake brake pad materialExcessive strain on brake system R educed brake performance due to vitrification of the brake padsurface Unpleasant noise Brake disc deformation resulting in brake wobble and brakejudder In the worst case, the brake disc friction surface may peel offPossible consequences:MEYLE‘s advice:MEYLE‘s advice:Use mounting paste and ensure all parts move freely duringinstallation. Avoid unnecessary disc brake drag.Ensure brake system is free of foreign objects during installation.Use high-quality brake components from MEYLE. Replace brakepads along with brake discs! Limited/reduced braking power Unpleasant noise
CorrosionWheel hub run-outThe problem:The problem:Severe rust formation on brake discs and pads.Asymmetrical wear of brake disc front and rear sides. Formation ofbluish-black hotspots.Causes: limatic effects (e.g. road salt, moisture)C Extended periods of downtime with parking brake engaged Brake piston stuck in calliper Brake piston not fully returned to retracted positionCauses: B rake disc fails to fit flush against wheel hub M isalignment of functional axes W heel hub misalignment in relation to brake calliperPossible consequences:Possible consequences: ibration and brake judder caused by brake disc depositsV Noise generation Reduced braking power Overheating of brake discs and pads caused by rust spotsP ulsing brake pedal/judderS haking steering wheelR educed braking powerW ear limit reached prematurelyMEYLE‘s advice:MEYLE‘s advice:Avoid extended periods of vehicle downtime with parking brakecontinually engaged. Ensure all components are free-moving.After extended periods of downtime cautiously apply the brakes tounlock the brake system and ensure rust spots have been removed.Brake discs must be installed clean, dry and degreased. Check wheelhub for true running prior to brake disc installation.NOTE: Any existing wheel hub run-out is doubled owing to thelarger brake disc diameter. Using a dial gauge with adjustablemagnetic base allows you to check for installation-induced run-outdirectly on the car instead of performing a test drive.
Asymmetrical wear of brakedisc front and rear sidesContaminated mountingface, pressure marks andcorrosionThe problem:The problem:Brake pad is pressed unevenly against brake disc.Plane-parallel installation is not or not fully possible.Causes:Causes: F ailure to clean wheel hub mounting face correctly D irt or rust particles trapped between brake disc and hub G rease/paste form foreign objects trapped between brake discand wheel hubBrake pad seizedProblems during installingAnti-squeal shims out of placeBrake calliper positioned incorrectlyPossible consequences: symmetrical wear of brake disc front and rear sidesA Reduced braking power Pulsing brake pedal/judder Shaking steering wheel Possible noise generation Wear limit reached prematurelyPossible consequences: A symmetrical wearP ulsing brake pedal/judderS haking steering wheelR educed braking powerW ear limit reached prematurelyMEYLE‘s advice:MEYLE‘s advice:Ensure all components are free-moving. Ensure correct positioningof brake calliper. Observe mounting instructions.Mounting face must be clean, dry and rust-free. Check wheel hubfor true running/run-out prior to brake disc installation. Using adial gauge with adjustable magnetic base allows you to checkfor installation-induced run-out directly on the car instead ofperforming a test drive.
Mounting face crackedaround boresThe problem:Formation of cracks in area surrounding wheel bolt holes.Causes: E xcessive torque to tighten wheel nuts and bolts F ailure to tighten wheel nuts and bolts in correct order L ack of plane-parallel alignment between wheel hub andbrake discPossible consequences: B rake disc shakes immediately after installation M ounting face deformation (cracks might not be visible) B rake disc cracks under loadMEYLE‘s advice:Adhere to tightening torques and sequences specified by themanufacturer. Ensure plane-parallel installation. Using a dial gaugewith adjustable magnetic base allows you to check for installationinduced run-out directly on the car instead of performing a testdrive.We make braking a safe experience.MEYLE Platinum Pads offer maximum driving comfortto exclusive standards.Specially designed to suit the needs of luxury models, SUVsand light commercial vehicles (LCVs) MEYLE brake pads set thebenchmark in premium brake technology. Dispensing with copperand heavy-metal compounds MEYLE Platinum Pads offer a bestin-class friction coefficient. Outstanding responsiveness and stablebraking even at high temperatures along with extremely low noiselevels are the key features which put the latest generation of MEYLEbrake discs in a class of their own. MEYLE Platinum Pads ensure shortbraking distances and stable braking in any situation.Naturally, MEYLE Platinum Pads are ECE R90 type-approvedand virtually all are fitted with MEYLE 3L shims.www.meyle.com
Your source for MEYLE parts:1571.en4 040074 143476Caution: These instructions are for information purposesonly and are no substitute for the specificationsof the vehicle manufacturers. Repairs may only be performed by properlytrained staff.Wulf Gaertner Autoparts AGMerkurring 111 22143 Hamburg Germanycontact@meyle.com www.meyle.com
on disc brakes The problem: Brake pad fails to disengage and rubs against the disc. This can cause the brake system to overheat. Causes: Brake pad seized Brake piston stuck in calliper Driving with depressed brake pedal, e.g. when going downhill Possible consequences: Reduced brake
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(2) Install the front disc brake anti-squeal shim to each front disc brake pad. NOTICE Figure 3. 1 Front Disc Brake Anti-squeal Shim 3. Road test the vehicle to confirm proper brake pad installation. NOTICE When applying disc brake grease, use the grease enclosed with a front disc brake pad kit or supplied
C. Modeling ANSYS workbench The finite element method is analyzed on ANSYS Workbench 17.2. The project schematic on workbench. The geometrical model of Al-MMC brake disc- Kevlar brake pad, Al-MMC brake disc-aluminum alloy brake pad and Al-MMC brake disc-ceramic brake pad were simulated by ANSYS
squeal, best method of analyzing brake disc is by complex Eigen value analysis. This technique is available in ANSYS 13 and can be used to determine stability of brake disc. The real and imaginary part of complex Eigen values is responsible for level of instability of brake disc assembly. Once imported frictionless support was given to brake disc
Demos: Descriptions, Process and Teaching Points 31 Disc 1 Pavitar 32 Disc 2 Cheryl 33 Disc 4 Amara 33 Disc 5 Masti 35 Disc 6 Nirala 37 Disc 7 Coral 39 Disc 8 Sam 40 Disc 9 Sahaja 41 Disc 10
frequently. Hydraulic disc brakes are comparatively more efficient than drum brake. Disc brake consist of a master cylinder with a reservoir in which hydraulic Fluid is kept, then the brake lines which will connect the master cylinder to the various brake calipers, brake caliper is the most important part of the whole disc brake system
for the calculation of the unstable frequencies of a car disc brake and the analysis procedure. The stationary components of the disc brake are modeled using finite elements and the disc as a thin plate. This approach facilitates the modelling of the disc brake squeal as a moving load problem.
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